Photocurrent
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Reversible Hydration of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> in Films, Single Crystals, and Solar Cells Open
Solar cells composed of methylammonium lead iodide perovskite (MAPI) are notorious for their sensitivity to moisture. We show that (i) hydrated crystal phases are formed when MAPI is exposed to water vapor at room temperature and (ii) thes…
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A highly efficient flexible dye-sensitized solar cell based on nickel sulfide/platinum/titanium counter electrode Open
A composite film of nickel sulfide/platinum/titanium foil (NiS/Pt/Ti) with low cost and high electrocatalytic activity was synthesized by the use of an in situ electropolymerization route and proposed as a counter electrode (CE) catalyst f…
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Non-Fullerene Electron Acceptors for Use in Organic Solar Cells Open
The active layer in a solution processed organic photovoltaic device comprises a light absorbing electron donor semiconductor, typically a polymer, and an electron accepting fullerene acceptor. Although there has been huge effort targeted …
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Photocurrent generation with two-dimensional van der Waals semiconductors Open
We review photodetectors based on transition metal dichalcogenides, novel van der Waals materials, black phosphorus, and heterostructures.
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Unreacted PbI<sub>2</sub> as a Double-Edged Sword for Enhancing the Performance of Perovskite Solar Cells Open
Lead halide perovskites have over the past few years attracted considerable interest as photo absorbers in PV applications with record efficiencies now reaching 22%. It has recently been found that not only the composition but also the pre…
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Lead‐Free Inverted Planar Formamidinium Tin Triiodide Perovskite Solar Cells Achieving Power Conversion Efficiencies up to 6.22% Open
Efficient lead (Pb)-free inverted planar formamidinium tin triiodide (FASnI3 ) perovskite solar cells (PVSCs) are demonstrated. Our FASnI3 PVSCs achieved average power conversion efficiencies (PCEs) of 5.41% ± 0.46% and a maximum PCE of 6.…
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2D perovskite stabilized phase-pure formamidinium perovskite solar cells Open
Compositional engineering has been used to overcome difficulties in fabricating high-quality phase-pure formamidinium perovskite films together with its ambient instability. However, this comes alongside an undesirable increase in bandgap …
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Solvent-Mediated Crystallization of CH<sub>3</sub>NH<sub>3</sub>SnI<sub>3</sub>Films for Heterojunction Depleted Perovskite Solar Cells Open
Organo-lead halide perovskite solar cells have gained enormous significance and have now achieved power conversion efficiencies of ∼20%. However, the potential toxicity of lead in these systems raises environmental concerns for widespread …
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Plasmon induced thermoelectric effect in graphene Open
Graphene has emerged as a promising material for optoelectronics due to its potential for ultrafast and broad-band photodetection. The photoresponse of graphene junctions is characterized by two competing photocurrent generation mechanisms…
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Quantized circular photogalvanic effect in Weyl semimetals Open
The circular photogalvanic effect (CPGE) is the part of a photocurrent that switches depending on the sense of circular polarization of the incident light. It has been consistently observed in systems without inversion symmetry and depends…
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Cu<sub>2</sub>O Nanowire Photocathodes for Efficient and Durable Solar Water Splitting Open
Due to its abundance, scalability, and nontoxicity, Cu2O has attracted extensive attention toward solar energy conversion, and it is the best performing metal oxide material. Until now, the high efficiency devices are all planar in structu…
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Cu2O/CuO Bilayered Composite as a High-Efficiency Photocathode for Photoelectrochemical Hydrogen Evolution Reaction Open
Solar powered hydrogen evolution reaction (HER) is one of the key reactions in solar-to-chemical energy conversion. It is desirable to develop photocathodic materials that exhibit high activity toward photoelectrochemical (PEC) HER at more…
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Efficient Monolithic Perovskite/Silicon Tandem Solar Cell with Cell Area >1 cm<sup>2</sup> Open
Monolithic perovskite/crystalline silicon tandem solar cells hold great promise for further performance improvement of well-established silicon photovoltaics; however, monolithic tandem integration is challenging, evidenced by the modest p…
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An Electrochemically Treated BiVO<sub>4</sub> Photoanode for Efficient Photoelectrochemical Water Splitting Open
BiVO 4 films with (040) facet grown vertically on fluorine doped SnO 2 (FTO) glass substrates are prepared by a seed‐assisted hydrothermal method. A simple electrochemical treatment process drastically enhances the photocatalytic activity …
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Photocurrent of BiVO<sub>4</sub> is limited by surface recombination, not surface catalysis Open
The main role of a cobalt phosphate catalyst on BiVO4 is to improve the photocurrent by passivating the surface and suppressing recombination.
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Heteroatom‐Mediated Interactions between Ruthenium Single Atoms and an MXene Support for Efficient Hydrogen Evolution Open
A titanium carbide (Ti 3 C 2 T x ) MXene is employed as an efficient solid support to host a nitrogen (N) and sulfur (S) coordinated ruthenium single atom (Ru SA ) catalyst, which displays superior activity toward the hydrogen evolution re…
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Vacancy‐Rich Monolayer BiO<sub>2−<i>x</i></sub> as a Highly Efficient UV, Visible, and Near‐Infrared Responsive Photocatalyst Open
Vacancy‐rich layered materials with good electron‐transfer property are of great interest. Herein, a full‐spectrum responsive vacancy‐rich monolayer BiO 2− x has been synthesized. The increased density of states at the conduction band (CB)…
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Optoelectronic crystal of artificial atoms in strain-textured molybdenum disulphide Open
The isolation of the two-dimensional semiconductor molybdenum disulphide introduced a new optically active material possessing a band gap that can be facilely tuned via elastic strain. As an atomically thin membrane with exceptional streng…
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Regulating the absorption spectrum of polydopamine Open
This work demonstrates a strategy to regulate the absorption spectrum of polydopamine via macromolecular structural tailoring.
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Surface Recombination and Collection Efficiency in Perovskite Solar Cells from Impedance Analysis Open
The large diffusion lengths recurrently measured in perovskite single crystals and films signal small bulk nonradiative recombination flux and locate the dominant carrier recombination processes at the outer interfaces. Surface recombinati…
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Characterization of Planar Lead Halide Perovskite Solar Cells by Impedance Spectroscopy, Open-Circuit Photovoltage Decay, and Intensity-Modulated Photovoltage/Photocurrent Spectroscopy Open
Thin film lead halide perovskite cells, where the perovskite layer is deposited directly onto a flat titania blocking layer, have reached AM 1.5 efficiencies of over 15%,1 showing that the mesoporous scaffold used in early types of perovsk…
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Gate Controlled Photocurrent Generation Mechanisms in High-Gain In<sub>2</sub>Se<sub>3</sub> Phototransistors Open
Photocurrent in photodetectors incorporating van der Waals materials is typically produced by a combination of photocurrent generation mechanisms that occur simultaneously during operation. Because of this, response times in these devices …
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Interface passivation for 31.25%-efficient perovskite/silicon tandem solar cells Open
Silicon solar cells are approaching their theoretical efficiency limit of 29%. This limitation can be exceeded with advanced device architectures, where two or more solar cells are stacked to improve the harvesting of solar energy. In this…
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Hot Hole Collection and Photoelectrochemical CO<sub>2</sub> Reduction with Plasmonic Au/p-GaN Photocathodes Open
Harvesting nonequilibrium hot carriers from plasmonic-metal nanostructures offers unique opportunities for driving photochemical reactions at the nanoscale. Despite numerous examples of hot electron-driven processes, the realization of pla…
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Shift current bulk photovoltaic effect in polar materials—hybrid and oxide perovskites and beyond Open
The bulk photovoltaic effect (BPVE) refers to the generation of a steady photocurrent and above-bandgap photovoltage in a single-phase homogeneous material lacking inversion symmetry. The mechanism of BPVE is decidedly different from the t…
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Pressure-Induced Phase Transformation, Reversible Amorphization, and Anomalous Visible Light Response in Organolead Bromide Perovskite Open
Hydrostatic pressure, as an alternative of chemical pressure to tune the crystal structure and physical properties, is a significant technique for novel function material design and fundamental research. In this article, we report the phas…
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Black phosphorene as a hole extraction layer boosting solar water splitting of oxygen evolution catalysts Open
As the development of oxygen evolution co-catalysts (OECs) is being actively undertaken, the tailored integration of those OECs with photoanodes is expected to be a plausible avenue for achieving highly efficient solar-assisted water split…
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Distinguishing between plasmon-induced and photoexcited carriers in a device geometry Open
The use of surface plasmons, charge density oscillations of conduction electrons of metallic nanostructures, to boost the efficiency of light-harvesting devices through increased light-matter interactions could drastically alter how sunlig…
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CsPbBr<sub>3</sub> Perovskite Nanocrystal Grown on MXene Nanosheets for Enhanced Photoelectric Detection and Photocatalytic CO<sub>2</sub> Reduction Open
All-inorganic CsPbX3 (X = Cl, Br or I) perovskite nanocrystals have attracted extensive interest recently due to their exceptional optoelectronic properties. In an effort to improve the charge separation and transfer following efficient ex…
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Long-range exciton diffusion in molecular non-fullerene acceptors Open
The short exciton diffusion length associated with most classical organic semiconductors used in organic photovoltaics (5-20 nm) imposes severe limits on the maximum size of the donor and acceptor domains within the photoactive layer of th…