Richard H. Friend

Enhancement of charge-transport characteristics in polymeric films using polymer brushes.

Tuning the Semiconducting Properties of Sexithiophene by alpha,omega-Substitution-alpha,omega-Diperfluorohexylsexithiophene: The First n-Type Sexithiophene for Thin-Film Transistors We thank DARPA (N00421-98-1187) and the NSF-MRSEC program through the Northwestern Materials Research Center (DMR-9632472) for support of this research. H.S. thanks the Royal Society for a University Research Fellowship (URF).

Attaching perylene dyes to polyfluorene: three simple, efficient methods for facile color tuning of light-emitting polymers.

Cyclodextrin-threaded conjugated polyrotaxanes as insulated molecular wires with reduced interstrand interactions.

Self-aligned, vertical-channel, polymer field-effect transistors.

Solution-processed anodes from layer-structure materials for high-efficiency polymer light-emitting diodes.

Efficient energy transfer in mixed columnar stacks of hydrogen-bonded oligo(p-phenylene vinylene)s in solution.

Solution-processible conjugated electrophosphorescent polymers.

Exciton regeneration at polymeric semiconductor heterojunctions.

General observation of n-type field-effect behaviour in organic semiconductors.

Correlation between surface photovoltage and blend morphology in polyfluorene-based photodiodes.

Exciton migration in a polythiophene: probing the spatial and energy domain by line-dipole Forster-type energy transfer.

Exciton trapping at heterojunctions in polymer blends.

Self-organization of nanocrystals in polymer brushes. Application in heterojunction photovoltaic diodes.

Effects of packing structure on the optoelectronic and charge transport properties in poly(9,9-di-n-octylfluorene-alt-benzothiadiazole).

The effects of supramolecular assembly on exciton decay rates in organic semiconductors.

Blue-to-green electrophosphorescence of iridium-based cyclometallated materials.

Metallic photonic crystals based on solution-processible gold nanoparticles.

Control of morphology in efficient photovoltaic diodes from discotic liquid crystals.

Triplet energy back transfer in conjugated polymers with pendant phosphorescent iridium complexes.

Identification of a quenching species in ruthenium tris-bipyridine electroluminescent devices.

Effect of temperature and chain length on the bimodal emission properties of single polyfluorene copolymer molecules.

Anomalous energy transfer dynamics due to torsional relaxation in a conjugated polymer.

Uniaxial alignment of liquid-crystalline conjugated polymers by nanoconfinement.

Role of intermolecular coupling in the photophysics of disordered organic semiconductors: aggregate emission in regioregular polythiophene.

Efficiency enhancements in solid-state hybrid solar cells via reduced charge recombination and increased light capture.

Optical spectroscopy of a polyfluorene copolymer at high pressure: intra- and intermolecular interactions.

Exciplex emission from electroluminescent ladder-type pentaphenylene oligomers bearing both electron- and hole-accepting substituents.

Electronic structures of interfacial states formed at polymeric semiconductor heterojunctions.

Tuning interfacial charge-transfer excitons at polymer-polymer heterojunctions under hydrostatic pressure.

Direct evidence for delocalization of charge carriers at the Fermi level in a doped conducting polymer.

Probing the morphology and energy landscape of blends of conjugated polymers with sub-10 nm resolution.

Optoelectronic and charge transport properties at organic-organic semiconductor interfaces: comparison between polyfluorene-based polymer blend and copolymer.

Charge recombination in organic photovoltaic devices with high open-circuit voltages.

Low-temperature control of nanoscale morphology for high performance polymer photovoltaics.

"Helter-skelter-like" perylene polyisocyanopeptides.

Excitonic versus electronic couplings in molecular assemblies: The importance of non-nearest neighbor interactions.

Determining exciton coherence from the photoluminescence spectral line shape in poly(3-hexylthiophene) thin films.

Direct evidence for the role of the madelung potential in determining the work function of doped organic semiconductors.

The relationship between nanoscale architecture and charge transport in conjugated nanocrystals bridged by multichromophoric Polymers.

Ion-induced formation of charge-transfer states in conjugated polyelectrolytes.

Single-photon pumping and two-photon probing spectroscopy for the determination of absorption cross-sections in an organic semiconductor.

Charge-transfer character of excitons in poly[2,7-(9,9-di-n-octylfluorene)(1-x)-co-4,7-(2,1,3-benzothiadiazole)(x)].

Role of delta-hole-doped interfaces at Ohmic contacts to organic semiconductors.

Charge recombination and exciton annihilation reactions in conjugated polymer blends.

High-performance polymer semiconducting heterostructure devices by nitrene-mediated photocrosslinking of alkyl side chains.

Phase-separated thin film structures for efficient polymer blend light-emitting diodes.

Effect of annealing on P3HT:PCBM charge transfer and nanoscale morphology probed by ultrafast spectroscopy.

Formation of nanopatterned polymer blends in photovoltaic devices.

Macromolecular scaffolding: the relationship between nanoscale architecture and function in multichromophoric arrays for organic electronics.

Poly(9,9-dioctylfluorene)-based conjugated polyelectrolyte: extended pi-electron conjugation induced by complexation with a surfactant zwitterion.

Subnanosecond geminate charge recombination in polymer-polymer photovoltaic devices.

Dye-sensitized solar cell based on a three-dimensional photonic crystal.

Efficient single-layer polymer light-emitting diodes.

Direct measurement of electric field-assisted charge separation in polymer:fullerene photovoltaic diodes.

Multichromophoric phthalocyanine-(perylenediimide)(8) molecules: a photophysical study.

Exciton fission and charge generation via triplet excitons in pentacene/C60 bilayers.

Enhanced photoresponse in solid-state excitonic solar cells via resonant energy transfer and cascaded charge transfer from a secondary absorber.

Conjugated zwitterionic polyelectrolyte as the charge injection layer for high-performance polymer light-emitting diodes.

Surface-directed spinodal decomposition in poly[3-hexylthiophene] and C₆₁-butyric acid methyl ester blends.

Pressure-induced delocalization of photoexcited states in a semiconducting polymer.

Sequential energy and electron transfer in polyisocyanopeptide-based multichromophoric arrays.

Tuning the electronic coupling in a low-bandgap donor-acceptor copolymer via the placement of side-chains.

Tunable charge transport using supramolecular self-assembly of nanostructured crystalline block copolymers.

High-performance electron-transporting polymers derived from a heteroaryl bis(trifluoroborate).

Ultrafast dynamics of exciton fission in polycrystalline pentacene.

Solvent additive control of morphology and crystallization in semiconducting polymer blends.

Collective osmotic shock in ordered materials.

Time-evolution of poly(3-hexylthiophene) as an energy relay dye in dye-sensitized solar cells.

Singlet exciton fission-sensitized infrared quantum dot solar cells.

On the role of single regiodefects and polydispersity in regioregular poly(3-hexylthiophene): defect distribution, synthesis of defect-free chains, and a simple model for the determination of crystallinity.

The Role of Driving Energy and Delocalized States for Charge Separation in Organic Semiconductors.

Excitons and charges at organic semiconductor heterojunctions.

Highly efficient single-layer polymer ambipolar light-emitting field-effect transistors.

Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes.

Morphology-dependent charge photogeneration in donor-acceptor block copolymer films based on poly(3-hexylthiophene)-block-poly(perylene bisimide acrylate).

In situ measurement of exciton energy in hybrid singlet-fission solar cells.

Direct observation of photoinduced bound charge-pair states at an organic-inorganic semiconductor interface.

Synthesis and photophysics of fully π-conjugated heterobis-functionalized polymeric molecular wires via Suzuki chain-growth polymerization.

On the energetic dependence of charge separation in low-band-gap polymer/fullerene blends.

Aqueous self-assembly of an electroluminescent double-helical metallopolymer.

Recombination Dynamics of Charge Pairs in a Push-Pull Polyfluorene-Derivative.

High internal quantum efficiency in fullerene solar cells based on crosslinked polymer donor networks.

Control of intrachain charge transfer in model systems for block copolymer photovoltaic materials.

Singlet exciton fission in polycrystalline pentacene: from photophysics toward devices.

Solar power. Preface.

Activated singlet exciton fission in a semiconducting polymer.

Suppressing recombination in polymer photovoltaic devices via energy-level cascades.

The role of spin in the kinetic control of recombination in organic photovoltaics.

Polymer crystallization as a tool to pattern hybrid nanostructures: growth of 12 nm ZnO arrays in poly(3-hexylthiophene).

Temperature-Independent Singlet Exciton Fission in Tetracene.

Singlet exciton fission in solution.

Ultrafast long-range charge separation in organic semiconductor photovoltaic diodes.

Triplet dynamics in pentacene crystals: applications to fission-sensitized photovoltaics.

Bimolecular recombination in organic photovoltaics.

Unequal partnership: asymmetric roles of polymeric donor and fullerene acceptor in generating free charge.

Quantitative bimolecular recombination in organic photovoltaics through triplet exciton formation.

Efficiency limitations in a low band-gap diketopyrrolopyrrole-based polymer solar cell.

A transferable model for singlet-fission kinetics.

Nanosecond intersystem crossing times in fullerene acceptors: implications for organic photovoltaic diodes.

How disorder controls the kinetics of triplet charge recombination in semiconducting organic polymer photovoltaics.

Temperature- and voltage-induced ligand rearrangement of a dynamic electroluminescent metallopolymer.

Bright light-emitting diodes based on organometal halide perovskite.

Highly efficient inverted polymer light-emitting diodes using surface modifications of ZnO layer.

Resonant energy transfer of triplet excitons from pentacene to PbSe nanocrystals.

Heterojunction modification for highly efficient organic-inorganic perovskite solar cells.

Engineering Schottky contacts in open-air fabricated heterojunction solar cells to enable high performance and ohmic charge transport.

Solution-processable singlet fission photovoltaic devices.

Improved Exciton Dissociation at Semiconducting Polymer:ZnO Donor:Acceptor Interfaces via Nitrogen Doping of ZnO.

Enhanced performance in fluorene-free organometal halide perovskite light-emitting diodes using tunable, low electron affinity oxide electron injectors.

In situ optical measurement of charge transport dynamics in organic photovoltaics.

Ultrasmooth organic-inorganic perovskite thin-film formation and crystallization for efficient planar heterojunction solar cells.

Interfacial control toward efficient and low-voltage perovskite light-emitting diodes.

Efficient light-emitting diodes based on nanocrystalline perovskite in a dielectric polymer matrix.

Atmospheric influence upon crystallization and electronic disorder and its impact on the photophysical properties of organic-inorganic perovskite solar cells.

The nature of singlet exciton fission in carotenoid aggregates.

Size-Dependent Photon Emission from Organometal Halide Perovskite Nanocrystals Embedded in an Organic Matrix.

Organic semiconductor spintronics: utilizing triplet excitons in organic electronics.

Identification of a triplet pair intermediate in singlet exciton fission in solution.

Improved Open- Circuit Voltage in ZnO-PbSe Quantum Dot Solar Cells by Understanding and Reducing Losses Arising from the ZnO Conduction Band Tail.

Blue-Green Color Tunable Solution Processable Organolead Chloride-Bromide Mixed Halide Perovskites for Optoelectronic Applications.

High Photoluminescence Efficiency and Optically Pumped Lasing in Solution-Processed Mixed Halide Perovskite Semiconductors.

Preparation of Single-Phase Films of CH3NH3Pb(I1-xBrx)3 with Sharp Optical Band Edges.

Charge-Transfer State Dynamics Following Hole and Electron Transfer in Organic Photovoltaic Devices.

A first-principles study of the vibrational properties of crystalline tetracene under pressure.

Hot-carrier cooling and photoinduced refractive index changes in organic-inorganic lead halide perovskites.

Spin-dependent recombination probed through the dielectric polarizability.

Influence of an Inorganic Interlayer on Exciton Separation in Hybrid Solar Cells.

Enhanced optoelectronic quality of perovskite thin films with hypophosphorous acid for planar heterojunction solar cells.

Harvesting the Full Potential of Photons with Organic Solar Cells.

Synthesis and Optical Properties of Lead-Free Cesium Tin Halide Perovskite Nanocrystals.

Highly Efficient Perovskite Nanocrystal Light-Emitting Diodes Enabled by a Universal Crosslinking Method.

Photon recycling in lead iodide perovskite solar cells.

Improving the Stability and Performance of Perovskite Light-Emitting Diodes by Thermal Annealing Treatment.

Efficient Visible Quasi-2D Perovskite Light-Emitting Diodes.

Tunable Near-Infrared Luminescence in Tin Halide Perovskite Devices.

Correlation between Photovoltaic Performance and Interchain Ordering Induced Delocalization of Electronics States in Conjugated Polymer Blends.

Impact of a Mesoporous Titania-Perovskite Interface on the Performance of Hybrid Organic-Inorganic Perovskite Solar Cells.

Compatibilization of All-Conjugated Polymer Blends for Organic Photovoltaics.

What Controls the Rate of Ultrafast Charge Transfer and Charge Separation Efficiency in Organic Photovoltaic Blends.

Metal-encapsulated organolead halide perovskite photocathode for solar-driven hydrogen evolution in water.

Intrinsic and Extrinsic Stability of Formamidinium Lead Bromide Perovskite Solar Cells Yielding High Photovoltage.

Limits for Recombination in a Low Energy Loss Organic Heterojunction.

Local Versus Long-Range Diffusion Effects of Photoexcited States on Radiative Recombination in Organic-Inorganic Lead Halide Perovskites.

Enhancing photoluminescence yields in lead halide perovskites by photon recycling and light out-coupling.

High Open-Circuit Voltages in Tin-Rich Low-Bandgap Perovskite-Based Planar Heterojunction Photovoltaics.

Is the Chemical Strategy for Imbuing "Polyene" Character in Diketopyrrolopyrrole-Based Chromophores Sufficient for Singlet Fission?

Understanding charge transport in lead iodide perovskite thin-film field-effect transistors.

Efficient Triplet Exciton Fusion in Molecularly Doped Polymer Light-Emitting Diodes.

Visualizing excitations at buried heterojunctions in organic semiconductor blends.

A Silicon-Singlet Fission Tandem Solar Cell Exceeding 100% External Quantum Efficiency with High Spectral Stability.