ברצוננו להודות ד&quot;ר פליקס Castellano (BGSU) וניל ע&quot;נ לדיוני ייעוץ ובעל ערך. אנו מכירים תודה &quot;חומר רשתות&quot; תכנית OBOR ואוניברסיטת מדינת באולינג גרין לתמיכה כספית. עבודה זו נתמכה בחלקה על ידי NSF בפרס המועצה להשכלה גבוהה - 1112227.

<ol>
	<li>Kamat, P. V., Flumiani, M., Dawson, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Metal+-+Metal+and+Metal-+Semiconductor+Composite+Nanoclusters.">Metal - Metal and Metal- Semiconductor Composite Nanoclusters.</a> Colloids Surf. A. 202, 269-279 (2002).</li><li>Dawson, A., Kamat, P. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Complexation+of+Gold+Nanoparticles+with+Radiolytically+Generated+Thiocyanate+Radicals+((SCN)2.">Complexation of Gold Nanoparticles with Radiolytically Generated Thiocyanate Radicals ((SCN)2.</a> J. Phys. Chem. B. 105, 960-966 (2001).</li><li>Borensztein, Y., Delannoy, L., Djedidi, A., Barrera, R. G., Louis, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Monitoring+of+the+Plasmon+Resonance+of+Gold+Nanoparticles+in+Au/TiO2+Catalyst+under+Oxidative+and+Reducing+Atmospheres.">Monitoring of the Plasmon Resonance of Gold Nanoparticles in Au/TiO2 Catalyst under Oxidative and Reducing Atmospheres.</a> J. Phys. Chem. C. 114, 9008 (2010).</li><li>Acharya, K. P., Khnayzer, R. S., O'Connor, T., Diederich, G., Kirsanova, M., Klinkova, A., Roth, D., Kinder, E., Imboden, M., Zamkov, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Role+of+Hole+Localization+in+Sacrificial+Hydrogen+Production+by+Semiconductor-Metal+Heterostructured+Nanocrystals.">The Role of Hole Localization in Sacrificial Hydrogen Production by Semiconductor-Metal Heterostructured Nanocrystals.</a> Nano Lett. 11, 2919 (2011).</li><li>Amirav, L., Alivisatos, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Photocatalytic+Hydrogen+Production+with+Tunable+Nanorod+Heterostructures.">Photocatalytic Hydrogen Production with Tunable Nanorod Heterostructures.</a> J. Phys. Chem. Lett. 1, 1051-1054 (2010).</li><li>Pattantyus-Abraham, A. G., Kramer, I. J., Barkhouse, A. R., Wang, X., Konstantatos, G., Debnath, R., Levina, L., Raabe, I., Nazeeruddin, M. K., Gratzel, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Depleted-Heterojunction+Colloidal+Quantum+Dot+Solar+Cells.">Depleted-Heterojunction Colloidal Quantum Dot Solar Cells.</a> ACS Nano. 4, 3374-3380 (2010).</li><li>Kinder, E., Moroz, P., Diederich, G., Johnson, A., Kirsanova, M., Nemchinov, A., O'Connor, T., Roth, D., Zamkov, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fabrication+of+All-Inorganic+Nanocrystal+Solids+through+Matrix+Encapsulation+of+Nanocrystal+Arrays.">Fabrication of All-Inorganic Nanocrystal Solids through Matrix Encapsulation of Nanocrystal Arrays.</a> J. Amer. Chem. Soc. 133, 20488-20499 (2011).</li><li>Davide, C. P., Liberato, M., Lucia, C. M., Stefan, K., Cinzia, G., Marinella, S., Angela, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Shape+and+Phase+Control+of+Colloidal+ZnSe+Nanocrystals.">Shape and Phase Control of Colloidal ZnSe Nanocrystals.</a> Chem. Mater. 17, 1296-1306 (2005).</li><li>Carbone, L., Nobile, C., de Giorgi, M., Sala, F. D., Morello, G., Pompa, P., Hytch, M., Snoeck, E., Fiore, A., Franchini, I. R., Nadasan, M., Silvestre, A. F., Chiodo, L., Kudera, S., Cingolani, R., Krahne, R., Manna, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synthesis+and+Micrometer-Scale+Assembly+of+Colloidal+CdSe/CdS+Nanorods+Prepared+by+a+Seeded+Growth+Approach.">Synthesis and Micrometer-Scale Assembly of Colloidal CdSe/CdS Nanorods Prepared by a Seeded Growth Approach.</a> Nano Lett. 7, 2942-2950 (2007).</li><li>Habas, S. E., Yang, P., Mokari, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Selective+Growth+of+Metal+and+Binary+Metal+Tips+on+CdS+Nanorods.">Selective Growth of Metal and Binary Metal Tips on CdS Nanorods.</a> J. Am. Chem. Soc. 130, 3294-3295 (2008).</li><li>Costi, R., Saunders, A. E., Elmalem, E., Salant, A., Banin, U. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Visible+Light-Induced+Charge+Retention+and+Photocatalysis+with+Hybrid+CdSe-Au+Nanodumbbells.">Visible Light-Induced Charge Retention and Photocatalysis with Hybrid CdSe-Au Nanodumbbells.</a> Nano Lett. 8, 637-641 (2008).</li><li>Hines, M. A., Scholes, G. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Colloidal+PbS+Nanocrystals+with+Size-Tunable+Near-Infrared+Emission:+Observation+of+Post-Synthesis+Self-Narrowing+of+the+Particle+Size+Distribution.">Colloidal PbS Nanocrystals with Size-Tunable Near-Infrared Emission: Observation of Post-Synthesis Self-Narrowing of the Particle Size Distribution.</a> Adv. Mater. 15, 1844-1849 (2003).</li><li>Pietryga, J. M., Werder, D. J., Williams, D. J., Casson, J. L., Schaller, R. D., Klimov, V. I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Utilizing+the+Lability+of+Lead+Selenide+to+Produce+Heterostructured+Nanocrystals+with+Bright,+Stable+Infrared+Emission.">Utilizing the Lability of Lead Selenide to Produce Heterostructured Nanocrystals with Bright, Stable Infrared Emission.</a> J. Am. Chem. Soc. 130, 4879-4885 (2008).</li><li>Tang, J., Kemp, K. W., Hoogland, S., Jeong, K. S., Liu, H., Levina, L., Furukawa, M., Wang, X., Debnath, R., Cha, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Colloidal-quantum-dot+photovoltaics+using+atomic-ligand+passivation.">Colloidal-quantum-dot photovoltaics using atomic-ligand passivation.</a> Nat. Mat. 10, 765-771 (2011).</li></ol>

אין ניגודי האינטרסים הכריזו.

מחקר זה מדגים כיצד ארכיטקטורות מורכבות של nanocrystals האורגני יכולות להיות מועסקות על מנת להשיג הפרדה המרחבית של חיובי photoinduced. בפרט, הרוכבים האלה מאפשרים כוונון העדין של התפלגות מטענים על פני שני התחומים, אשר ניתנים לביצוע גם פונקצית הפוטו או פוטו. לדוגמה, photocatalysts היעיל י...

<table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> שם המגיב </td><td> חברה </td><td> מספר קטלוגים </td><td> תגובות (אופציונלי) </td></tr><tr><td> octadecylamine (ODA), 90% </td><td> דיג </td><td> AC12932-0050 </td><td></td></tr><tr><td> סלניום (Se), 200 רשת </td><td> Acros </td><td> AC19807-2500 </td><td></td></tr><tr><td> Tri-n-octylphosphine (למעלה), 97% </td><td> שטרם </td><td> 15-6655 </td><td> אוויר רגיש </td></tr><tr><td> diethyl אבץ (Et2Zn), 10% על ידי WT. </td><td> אולדריץ </td><td> 22080 </td><td> אוויר רגיש, רגיש לאור </td></tr><tr><td> מתנול, 99.8%, נטול מים </td><td> אולדריץ </td><td> 179337 </td><td></td></tr><tr><td> טולואן, 99.8%, נטול מים </td><td> אולדריץ </td><td> 244511 </td><td></td></tr><tr><td> Tri-n-octylphosphine תחמוצת (topo), 99% </td><td> אולדריץ </td><td> 223301 </td><td></td></tr><tr><td> n-octadecylphosphonic חומצה (ODPA), 98% </td><td> סינתזת PCI </td><td> 104224 </td><td></td></tr><tr><td> hexylphosphonic חומצה (HPA), 98% </td><td> סינתזת PCI </td><td> 4721-24-8 </td><td></td></tr><tr><td> תחמוצת קדמיום (CDO), 99.99% </td><td> אולדריץ </td><td> 202894 </td><td></td></tr><tr><td> גופרית (S), 99.999% </td><td> Acros </td><td> AC19993-0500 </td><td> ריח חזק </td></tr><tr><td> חומצה 11-mercaptoundecanoic (MUA), 95% </td><td> אולדריץ </td><td> 450561 </td><td></td></tr><tr><td> אשלגן (KOH) </td><td> Acros </td><td> AC13406-0010 </td><td></td></tr><tr><td> כלורופורם </td><td> VWR </td><td> EM-CX1059-1 </td><td></td></tr><tr><td> להוביל תחמוצת (PBO), 99.999% </td><td> אולדריץ </td><td>32306-1 ק&quot;ג </td><td></td></tr><tr><td> 1-octadecene (יודה), 90% </td><td> אולדריץ </td><td> O806-25ML </td><td></td></tr><tr><td> חומצה אולאית (OA), 90% </td><td> אולדריץ </td><td> O1008-1G </td><td></td></tr><tr><td> גופרתי bis (trimethylsilyl) (TMS), כיתה סינטתית </td><td> אולדריץ </td><td> 283134-25G </td><td> אוויר, ריח חזק רגיש, מאוד תגובתי </td></tr><tr><td> אצטון </td><td> כימיקלי EMD </td><td> AX0118-2 </td><td></td></tr><tr><td> תצטט קדמיום </td><td> Acros </td><td> AC31713-5000 </td><td></td></tr><tr><td> nonahydrate נתרן גופרתי (Na 2 S • 9 שעות 2 O), 98% </td><td> אלפא Aesar </td><td> CB1100945 </td><td> אור רגיש </td></tr><tr><td> רומיד hexadecyltrimethyl אמוניום (CTAB), 99% </td><td> סיגמא </td><td> H6269-100G </td><td></td></tr><tr><td> oleylamine, 70% </td><td> אולדריץ </td><td> O7805-5G </td><td></td></tr><tr><td> אתר diphenyl </td><td> אלפא Aesar </td><td> 101-84-8 </td><td></td></tr><tr><td> 1,2-hexadecanediol </td><td> TCI </td><td> 6920-24-7 </td><td></td></tr><tr><td> acetylacetonate Pt (השני), 97% </td><td> אולדריץ </td><td> 282782-5G </td><td></td></tr><tr><td> isopropanol, 99.8%, נטול מים </td><td> Acros </td><td> AC32696-0025 </td><td></td></tr><tr><td> טיטניום טטרא (TiCl4), 99.9% </td><td> אולדריץ </td><td> 697079-25G </td><td> מאוד רגיש אוויר </td></tr><tr><td> טיטניום דו חמצני, DSL 90T </td><td> Dyesol </td><td> DSL 90T </td><td></td></tr><tr><td> terpineol </td><td> חבר פרלמנט ביו רפואית </td><td> 98-55-5 </td><td></td></tr><tr><td> חומצה 3-mercaptopropionic (MPA), 99% </td><td> אלפא Aesar </td><td> A10435 </td><td> ריח חזק </td></tr><tr><td> יוקטנו, נטולי מים, 99% </td><td> אולדריץ </td><td> 412236 </td><td></td></tr></tbody></table>

harvesting solar energy by means of charge-separating nanocrystals and their solids

התלכדות חומרים מוליכים למחצה שונים באחת ננו מרוכבים מספקת אמצעים סינטטיים לפיתוח של חומרים חדשים אופטו מציעים שליטה מעולה על ההתפלגות המרחבית של נושאי מטען על פני ממשקי חומר. כמחקר זה מדגים, שילוב של תחומי התורם acceptor ננו (NC) בnanoparticle אחת יכול להוביל למימוש 1-5 חומרים photocatalytic יעילים, תוך הרכבה שכבתית של סרטי תורם וnanocrystals acceptor הדמוי מעוררת פוטו חומרים. תחילה העבודה מתרכזת בסינתזה של nanocrystals האורגני המורכב, הכוללת ZnSe נערם באופן ליניארי, תקליטורים, ותחומי Pt, שמשותף לקדם תשלום הפרדת photoinduced. מבנים אלה נמצאים בשימוש בתמיסות מימיות לphotocatalysis של מים מתחת לקרינת שמש, וכתוצאה מכך הייצור של 2 H גז. כדי לשפר את ההפרדה של photoinducedחיובים, מורפולוגיה nanorod עם שיפוע ליניארי שמקורם שדה חשמלי פנימי משמשת 5. האנרגטיקה בין התחום אז מותאמת לנהוג אלקטרוני photogenerated כיוון האתר הקטליטי Pt תוך גירוש החורים אל פני השטח של תחומי ZnSe להתחדשות הקרבה (באמצעות מתנול). כאן אנו מראים כי הדרך היעילה רק כדי לייצר מימן היא להשתמש ligands אלקטרונים תורמים לpassivate מדינות פני השטח על ידי כוונון יישור רמת האנרגיה בממשק מוליכים למחצה יגנד. ירידה יציבה ויעילה של מים מותרת על ידי ligands אלה בשל העובדה שהם ממלאים משרות פנויות בפס הערכיות של תחום המוליכים למחצה, מניעת חורים אנרגטיים מזה משפיל. באופן ספציפי, אנו מראים כי האנרגיה של החור מועברת למחצית יגנד, עוזבת את תחום המוליכים למחצה פונקציונלי. זה מאפשר לנו להחזיר את המערכת כולה ננו-יגנד למצב תפקודי, כאשר ligands מפורק, פשוט על ידי הוספת ligands הטרי למערכת 4. כדי לקדם את תשלום הפרדת פוטו, אנו משתמשים מוצקים דו שכבתיים משולבים של 2 סרטי PBS ודוד. בתצורה זו, אלקטרוני photoinduced מוזרקים Tio 2 ולאחר מכן נאספים על ידי אלקטרודה FTO, ואילו חורים מועברים לאלקטרודה Au דרך PbS 6 שכבה. כדי לפתח את האחרונים אנחנו מציגים במערכי סמיקונדקטור מטריקס Encapsulated ננו אסטרטגיה (SMENA), המאפשרת NCS PbS מליטה לתוך המטריצה ​​שמסביב של מוליכים למחצה תקליטורים. כתוצאה מכך, מוצקים מפוברקים תערוכת יציבות תרמית מעולה, שיוחסו למבנה heteroepitaxial של ממשקי ננו מטריצה, ולהראות ביצועי אור קצירה משכנעים בתאי אב טיפוס שמש 7.

Watch this Scientific Journal Video about Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids at JoVE.com

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

אסטרטגיה כללית לפיתוח של הפרדת תשלום מרוכבים מוליכים למחצה ננו פריסה לייצור אנרגיה סולארית מוצגת. אנו מראים כי הרכבה של תחומי התורם acceptor ננו בגיאומטרית nanoparticle אחת מעורר פונקצית הפוטו, בעוד בתפזורת-heterojunctions של-acceptor תורם ננו סרטים יכול לשמש להמרת אנרגית פוטו.

קצירת אנרגיה סולארית באמצעות תשלום פרדת Nanocrystals והמוצק שלהם

Conjoining different semiconductor materials in a single nano-composite provides synthetic means for the development of novel optoelectronic materials ...

harvesting-solar-energy-means-charge-separating-nanocrystals-their

Research

JoVE Journal

Engineering

14.0K Views.  Bowling Green State University. אסטרטגיה כללית לפיתוח של הפרדת תשלום מרוכבים מוליכים למחצה ננו פריסה לייצור אנרגיה סולארית מוצגת. אנו מראים כי הרכבה של תחומי התורם acceptor ננו בגיאומטרית nanoparticle אחת מעורר פונקצית הפוטו, בעוד בתפזורת-heterojunctions של-acceptor תורם ננו סרטים יכול לשמש להמרת אנרגית פוטו.

Video: Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments

In materials science and engineering it is often necessary to obtain quantitative measurements of surface topography with micrometer lateral resolution. From the measured surface, 3D topographic maps can be subsequently analyzed using a variety of software packages to extract the information that is needed.
In this article we describe how white light interferometry, and optical profilometry (OP) in general, combined with generic surface analysis software, can be used for materials science and engineering tasks. In this article, a number of applications of white light interferometry for investigation of surface modifications in mass spectrometry, and wear phenomena in tribology and lubrication are demonstrated. We characterize the products of the interaction of semiconductors and metals with energetic ions (sputtering), and laser irradiation (ablation), as well as ex situ measurements of wear of tribological test specimens.
Specifically, we will discuss:
<ol class="lroman">
	<li>Aspects of traditional ion sputtering-based mass spectrometry such as sputtering rates/yields measurements on Si and Cu and subsequent time-to-depth conversion.</li>
	<li>Results of quantitative characterization of the interaction of femtosecond laser irradiation with a semiconductor surface. These results are important for applications such as ablation mass spectrometry, where the quantities of evaporated material can be studied and controlled via pulse duration and energy per pulse. Thus, by determining the crater geometry one can define depth and lateral resolution versus experimental setup conditions.</li>
	<li>Measurements of surface roughness parameters in two dimensions, and quantitative measurements of the surface wear that occur as a result of friction and wear tests.</li>
</ol>
Some inherent drawbacks, possible artifacts, and uncertainty assessments of the white light interferometry approach will be discussed and explained.

White light microscope interferometry is an optical, noncontact and quick method for measuring the topography of surfaces. It is shown how the method can be applied toward mechanical wear analysis, where wear scars on tribological test samples are analyzed; and in materials science to determine ion beam sputtering or laser ablation volumes and depths.

אפיון של פני שטח על ידי שינויי Interferometry אור הלבן: יישומים ביון יורקת, אבלציה ליזר, וניסויי Tribology

In materials science and engineering it is often necessary to obtain quantitative measurements of surface topography with micrometer lateral resolution. ...

Fabrication of Nano-engineered Transparent Conducting Oxides by Pulsed Laser Deposition

Nanosecond Pulsed Laser Deposition (PLD) in the presence of a background gas allows the deposition of metal oxides with tunable morphology, structure, density and stoichiometry by a proper control of the plasma plume expansion dynamics. Such versatility can be exploited to produce nanostructured films from compact and dense to nanoporous characterized by a hierarchical assembly of nano-sized clusters. In particular we describe the detailed methodology to fabricate two types of Al-doped ZnO (AZO) films as transparent electrodes in photovoltaic devices: 1) at low O2 pressure, compact films with electrical conductivity and optical transparency close to the state of the art transparent conducting oxides (TCO) can be deposited at room temperature, to be compatible with thermally sensitive materials such as polymers used in organic photovoltaics (OPVs); 2) highly light scattering hierarchical structures resembling a forest of nano-trees are produced at higher pressures. Such structures show high Haze factor (&gt;80%) and may be exploited to enhance the light trapping capability. The method here described for AZO films can be applied to other metal oxides relevant for technological applications such as TiO2, Al2O3, WO3 and Ag4O4.

We describe the experimental method to deposit nanostructured oxide thin films by nanosecond Pulsed Laser Deposition (PLD) in the presence of a background gas. By using this method Al-doped ZnO (AZO) films, from compact to hierarchically structured as nano-tree forests, can be deposited.

ייצור של ננו מהונדס תחמוצות שקופות לנהל בתצהיר ליזר פעם

Nanosecond Pulsed  Laser Deposition (PLD) in the presence of a background gas allows the deposition  of metal oxides with tunable morphology, structure, ...

Making Record-efficiency SnS Solar Cells by Thermal Evaporation and Atomic Layer Deposition

Tin sulfide (SnS) is a candidate absorber material for Earth-abundant, non-toxic solar cells. SnS offers easy phase control and rapid growth by congruent thermal evaporation, and it absorbs visible light strongly. However, for a long time the record power conversion efficiency of SnS solar cells remained below 2%. Recently we demonstrated new certified record efficiencies of 4.36% using SnS deposited by atomic layer deposition, and 3.88% using thermal evaporation. Here the fabrication procedure for these record solar cells is described, and the statistical distribution of the fabrication process is reported. The standard deviation of efficiency measured on a single substrate is typically over 0.5%. All steps including substrate selection and cleaning, Mo sputtering for the rear contact (cathode), SnS deposition, annealing, surface passivation, Zn(O,S) buffer layer selection and deposition, transparent conductor (anode) deposition, and metallization are described. On each substrate we fabricate 11 individual devices, each with active area 0.25 cm2. Further, a system for high throughput measurements of current-voltage curves under simulated solar light, and external quantum efficiency measurement with variable light bias is described. With this system we are able to measure full data sets on all 11 devices in an automated manner and in minimal time. These results illustrate the value of studying large sample sets, rather than focusing narrowly on the highest performing devices. Large data sets help us to distinguish and remedy individual loss mechanisms affecting our devices.

Tin sulfide (SnS) is a candidate material for Earth-abundant, non-toxic solar cells. Here, we demonstrate the fabrication procedure of the SnS solar cells employing atomic layer deposition, which yields 4.36% certified power conversion efficiency, and thermal evaporation which yields 3.88%.

מה שהופך את התאים סולריים שיא יעילות SNS על ידי אידוי תרמי ואטומית שכבת הפקדת

Tin sulfide (SnS) is a candidate absorber material for Earth-abundant, non-toxic solar cells. SnS offers easy phase control and rapid growth by congruent ...

Integration of Light Trapping Silver Nanostructures in Hydrogenated Microcrystalline Silicon Solar Cells by Transfer Printing

One of the potential applications of metal nanostructures is light trapping in solar cells, where unique optical properties of nanosized metals, commonly known as plasmonic effects, play an important role. Research in this field has, however, been impeded owing to the difficulty of fabricating devices containing the desired functional metal nanostructures. In order to provide a viable strategy to this issue, we herein show a transfer printing-based approach that allows the quick and low-cost integration of designed metal nanostructures with a variety of device architectures, including solar cells. Nanopillar poly(dimethylsiloxane) (PDMS) stamps were fabricated from a commercially available nanohole plastic film as a master mold. On this nanopatterned PDMS stamps, Ag films were deposited, which were then transfer-printed onto block copolymer (binding layer)-coated hydrogenated microcrystalline Si (&#181;c-Si:H) surface to afford ordered Ag nanodisk structures. It was confirmed that the resulting Ag nanodisk-incorporated &#181;c-Si:H solar cells show higher performances compared to a cell without the transfer-printed Ag nanodisks, thanks to plasmonic light trapping effect derived from the Ag nanodisks. Because of the simplicity and versatility, further device application would also be feasible thorough this approach.

A viable transfer printing-based methodology to introduce plasmonic metal nanostructures in solar cells is described. Using nanopillar poly(dimethylsiloxane) stamps, an Ag-based ordered nanodisk array was integrated with standard hydrogenated microcrystalline Si solar cells, which led to improved device performances due to plasmonic light trapping.

שילוב של אור ננו-מבני כסף השמנה בתאים סולריים המוקשה Microcrystalline הסיליקון ידי העברת הדפסה

One of the potential applications of metal nanostructures is light trapping in solar cells, where unique optical properties of nanosized metals, commonly ...

Quantitative Hardness Measurement by Instrumented AFM-indentation

In this work, a combination of amplitude-modulated non-contact atomic force microscopy and atomic force spectroscopy is applied for instrumented hardness measurements on an Au(111) surface with atomistic resolution of single plasticity events. A careful experimental procedure is described that includes the force sensor selection, its calibration, the calibration of the cantilever deflection detection system, and the minimization of instrumental drift for accurate and reproducible force-distance measurements. Also, a method for the data analysis is presented that allows the extraction of force-penetration curves from recorded force-distance curves. A typical curve displays a clear elastic deformation regime up to the first plasticity event, or pop-in, with a length in the range of one to two Burger's vectors. Later plasticity events exhibit the same magnitude. The work of plasticity is further extracted from the measurements. Finally, the hardness is determined in combination with the indentation curve using non-contact atomic force microscopy images of the remaining indents.

This experimental protocol describes how atomic force microscopy can be used to measure hardness at the true nanometer scale and to detect single atomistic plasticity events.

מדידת קשיות כמוני יד מאובזרת AFM-הזחה

In this work, a combination of amplitude-modulated non-contact atomic force microscopy and atomic force spectroscopy is applied for instrumented hardness ...

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Here, we demonstrate the incorporation of monovalent cation additives into CH3NH3PbI3 perovskite in order to adjust the optical, excitonic, and electrical properties. The possibility of doping was investigated by adding monovalent cation halides with similar ionic radii to Pb2+, including Cu+, Na+, and Ag+. A shift in the Fermi level and a remarkable decrease of sub-bandgap optical absorption, along with a lower energetic disorder in the perovskite, was achieved. An order-of-magnitude enhancement in the bulk hole mobility and a significant reduction of transport activation energy within an additive-based perovskite device was attained. The confluence of the aforementioned improved properties in the presence of these cations led to an enhancement in the photovoltaic parameters of the perovskite solar cell. An increase of 70 mV in open circuit voltage for AgI and a 2 mA/cm2 improvement in photocurrent density for NaI- and CuBr-based solar cells were achieved compared to the pristine device. Our work paves the way for further improvements in the optoelectronic quality of CH3NH3PbI3 perovskite and subsequent devices. It highlights a new avenue for investigations on the role of dopant impurities in crystallization and controls the electronic defect density in perovskite structures.

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Here, we present a protocol to adjust the properties of solution-processed CH3NH3PbI3 through the incorporation of monovalent cation additives in order to achieve highly efficient perovskite solar cells.

חד ערכי חילוף קטיונים סימום של CH<sub&gt; 3</sub&gt; NH<sub&gt; 3</sub&gt; PBI<sub&gt; 3</sub&gt; עבור תאים סולריים יעילים perovskite

Here, we demonstrate the incorporation of monovalent cation additives into CH3NH3PbI3 perovskite in order to adjust the optical, excitonic, and electrical ...

High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia (YSZ) Scaffolds by In Situ Carbon Templating Xerogels

We demonstrate a method for the high temperature fabrication of porous, nanostructured yttria-stabilized-zirconia (YSZ, 8 mol% yttria - 92 mol% zirconia) scaffolds with tunable specific surface areas up to 80 m2&#183;g-1. An aqueous solution of a zirconium salt, yttrium salt, and glucose is mixed with propylene oxide (PO) to form a gel. The gel is dried under ambient conditions to form a xerogel. The xerogel is pressed into pellets and then sintered in an argon atmosphere. During sintering, a YSZ ceramic phase forms and the organic components decompose, leaving behind amorphous carbon. The carbon formed in situ serves as a hard template, preserving a high surface area YSZ nanomorphology at sintering temperature. The carbon is subsequently removed by oxidation in air at low temperature, resulting in a porous, nanostructured YSZ scaffold. The concentration of the carbon template and the final scaffold surface area can be systematically tuned by varying the glucose concentration in the gel synthesis. The carbon template concentration was quantified using thermogravimetric analysis (TGA), the surface area and pore size distribution was determined by physical adsorption measurements, and the morphology was characterized using scanning electron microscopy (SEM). Phase purity and crystallite size was determined using X-ray diffraction (XRD). This fabrication approach provides a novel, flexible platform for realizing unprecedented scaffold surface areas and nanomorphologies for ceramic-based electrochemical energy conversion applications, e.g. solid oxide fuel cell (SOFC) electrodes.

High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia YSZ Scaffolds by In Situ Carbon Templating Xerogels

A protocol for fabricating porous, nanostructured yttria-stabilized-zirconia (YSZ) scaffolds at temperatures between 1,000 &#176;C and 1,400 &#176;C is presented.

ייצור טמפרטורה גבוהה של Nanostructured yttria התייצב-Zirconia (YSZ) פיגומים על ידי<em&gt; באתרו</em&gt; Xerogels בניית תבנית פחמן

We demonstrate a method for the high temperature fabrication of porous, nanostructured yttria-stabilized-zirconia (YSZ, 8 mol% yttria - 92 mol% zirconia) ...

Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells

This manuscript describes how to design and fabricate efficient inverted solar cells, which are based on a two-dimensional conjugated small molecule (SMPV1) and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM), by utilizing ZnO nanorods (NRs) grown on a high quality Al-doped ZnO (AZO) seed layer. The inverted SMPV1:PC71BM solar cells with ZnO NRs that grew on both a sputtered and sol-gel processed AZO seed layer are fabricated. Compared with the AZO thin film prepared by the sol-gel method, the sputtered AZO thin film exhibits better crystallization and lower surface roughness, according to X-ray diffraction (XRD) and atomic force microscope (AFM) measurements. The orientation of the ZnO NRs grown on a sputtered AZO seed layer shows better vertical alignment, which is beneficial for the deposition of the subsequent active layer, forming better surface morphologies. Generally, the surface morphology of the active layer mainly dominates the fill factor (FF) of the devices. Consequently, the well-aligned ZnO NRs can be used to improve the carrier collection of the active layer and to increase the FF of the solar cells. Moreover, as an anti-reflection structure, it can also be utilized to enhance the light harvesting of the absorption layer, with the power conversion efficiency (PCE) of solar cells reaching 6.01%, higher than the sol-gel based solar cells with an efficiency of 4.74%.

This manuscript describes how to design and fabricate efficient inverted SMPV1:PC71BM solar cells with ZnO nanorods (NRs) grown on a high quality Al-doped ZnO (AZO) seed layer. The well-aligned vertically oriented ZnO NRs exhibit high crystalline properties. The power conversion efficiency of solar cells can reach 6.01%.

היטב מיושר אנכית מונחה ZnO Nanorod מערכים ויישומם ב הפוך קטן מולקולה תאים סולריים

This manuscript describes how to design and fabricate efficient inverted solar cells, which are based on a two-dimensional conjugated small molecule ...

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

We present a method to characterize achromatic Fresnel lenses for photovoltaic applications. The achromatic doublet on glass (ADG) Fresnel lens is composed of two materials, a plastic and an elastomer, whose dispersion characteristics (refractive index variation with wavelength) are different. We first designed the lens geometry and then used ray-tracing simulation, based on the Monte Carlo method, to analyze its performance from the point of view of both optical efficiency and the maximum attainable concentration. Afterwards, ADG Fresnel lens prototypes were manufactured using a simple and reliable method. It consists of a prior injection of plastic parts and a consecutive lamination, together with the elastomer and a glass substrate to fabricate the parquet of ADG Fresnel lenses. The accuracy of the manufactured lens profile is examined using an optical microscope while its optical performance is evaluated using a solar simulator for concentrator photovoltaic systems. The simulator is composed of a xenon flash lamp whose emitted light is reflected by a parabolic mirror. The collimated light has a spectral distribution and an angular aperture similar to the real Sun. We were able to assess the optical performance of the ADG Fresnel lenses by taking photographs of the irradiance spot cast by the lens using a charge-coupled device (CCD) camera and measuring the photocurrent generated by several types of multi junction (MJ) solar cells, which have been previously characterized at a solar simulator for concentrator solar cells. These measurements have demonstrated the achromatic behavior of ADG Fresnel lenses and, as a consequence, the suitability of the modelling and manufacturing methods.

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass ADG Fresnel Lens for Concentrating Photovoltaics

The achromatic doublet on glass (ADG) Fresnel lens makes use of two materials with differing dispersion to reduce chromatic aberration and increase attainable concentration. In this paper, a protocol for the complete characterization of the ADG Fresnel lens is presented.

הערכת ניסיוני מקורה של יעילות, Irradiance שתאכלו כפיל אכרומטי על זכוכית (ADG) עדשת פרנל ריכוז Photovoltaics

We present a method to characterize achromatic Fresnel lenses for photovoltaic applications. The achromatic doublet on glass (ADG) Fresnel lens is ...

Developing High Performance GaP/Si Heterojunction Solar Cells

To improve the efficiency of Si-based solar cells beyond their Shockley-Queisser limit, the optimal path is to integrate them with III-V-based solar cells. In this work, we present high performance GaP/Si heterojunction solar cells with a high Si minority-carrier lifetime and high crystal quality of epitaxial GaP layers. It is shown that by applying phosphorus (P)-diffusion layers into the Si substrate and a SiNx layer, the Si minority-carrier lifetime can be well-maintained during the GaP growth in the molecular beam epitaxy (MBE). By controlling the growth conditions, the high crystal quality of GaP was grown on the P-rich Si surface. The film quality is characterized by atomic force microscopy and high-resolution x-ray diffraction. In addition, MoOx was implemented as a hole-selective contact that led to a significant increase in the short-circuit current density. The achieved high device performance of the GaP/Si heterojunction solar cells establishes a path for further enhancement of the performance of Si-based photovoltaic devices.

Here, we present a protocol to develop high-performance GaP/Si heterojunction solar cells with a high Si minority-carrier lifetime.

פיתוח תאים סולריים ביצועים גבוהים פער/סי Heterojunction

To improve the efficiency of Si-based solar cells beyond their Shockley-Queisser limit, the optimal path is to integrate them with III-V-based solar ...