Understanding photophysical processes in lead halide perovskites is an important aspect of optimizing the performance optoelectronic devices. The determination exact charge carrier extraction rate constants remains elusive, as there a large and persistent discrepancy reported absolute values. In this review, we concentrate on experimental procedures adopted literature to obtain kinetic estimates transfer limitations imposed by spectroscopy technique employed. Time-resolved techniques (e.g.,...

Abstract Photoelectrochemistry holds the promise of directly converting sunlight to valuable chemical products. Photoelectrochemical (PEC) methods, however, lag behind their electrochemical counterparts in terms current density. In this work, we demonstrate that, by using concentrated sunlight, can achieve densities similar but with lower energy input. Specifically, combined direct PEC oxidation glycerol dark hydrogen evolution or CO 2 reduction a membrane-separated continuous-flow cell. We...

Photoinduced segregation in mixed halide perovskites has a direct influence on decreasing the solar cell efficiency as segregated I-rich domains serve charge recombination centers. The changes external quantum mirror spectral loss absorption; however, time scale of IPCE recovery dark is slower than absorption recovery, showing intricate nature photoinduced and collection devices.

Halide ion mobility in metal halide perovskites remains an intriguing phenomenon, influencing their optical and photovoltaic properties. Selective injection of holes through electrochemical anodic bias has allowed us to probe the effect hole trapping at iodide (0.9 V) bromide (1.15 mixed perovskite (CH3NH3PbBr1.5I1.5) films. Upon site, gradually gets expelled from film (as iodine and/or triiodide ion), leaving behind re-formed CH3NH3PbBr3 domains. The weakening Pb-I bond following (oxidation...

The unique optoelectronic properties of lead halide perovskites have triggered a new wave excitement in materials chemistry during the past five years. Electrochemistry, spectroelectrochemistry, and photoelectrochemistry could be viable tools both for analyzing features these assembling them into hybrid architectures (e.g., solar cells). At same time, instability limits pool solvents electrolytes that can employed such experiments. focus our study is to establish stability window...

Visible light irradiation of a mixed halide perovskite film in contact with solvent (dichloromethane, DCM) which the otherwise is stable leads to selective expulsion iodide (I) from concurrent shift band edge lower wavelengths. We have now employed perovskites uncover influence A-site cation [methylammonium (MA) and cesium (Cs)] on mobility ions under photoirradiation. In absence contact, films undergo photoinduced segregation rate constant that decreases increasing Cs content....

A major goal within the CO2 electrolysis community is to replace generally used Ir anode catalyst with a more abundant material, which stable and active for water oxidation under process conditions. Ni widely applied in alkaline electrolysis, it has been considered as potential electrolysis. Here we compare operation of electrolyzer cells anodes demonstrate that, while conditions, degradation leads rapid cell failure. This caused by two parallel mechanisms: (i) pH decrease anolyte near...

Bimetallic electrocatalysts offer great flexibility to tailor the activity and selectivity in electrochemical carbon dioxide (CO2) reduction. Here, we report on electrocatalytic behavior of Au–Sn bimetallic nanoparticles with different intermetallic phases toward CO2 electroreduction. Two high-value products formed reasonable current density: formic acid liquid phase syngas (CO + H2) gas phase. Notably, composition catalysts had a massive influence both product distribution. Selective...

The ternary compound, CuBi2O4, a 1:1 stoichiometric derivative of the two component oxides CuO and Bi2O3, has attracted attention from solar water splitting photocatalysis communities as p-type semiconductor responsive to visible light. This study demonstrates that solution combustion synthesis (SCS) can be used prepare powders not only this compound but also nanocomposites with either or Bi2O3 in excess. was simply done by tuning SCS precursor mixture composition. synthesized crystalline...

The kinetics of electron extraction at the transfer layer/perovskite interface strongly affects efficiency a perovskite solar cell. By combining transient absorption and time-resolved photoluminescence spectroscopy, process between FA0.83Cs0.17Pb(I0.83Br0.17)3 TiO2 single crystals with different orientations (100), (110), (111) were probed from subpicosecond to several hundred nanoseconds. It was revealed that band alignment constituents influenced relative process. TiO2(100) showed fastest...

Metal–halide perovskites transformed optoelectronics research and development during the past decade. They have also gained a foothold in photocatalytic photoelectrochemical processes recently, but their sensitivity to most commonly applied solvents electrolytes together with susceptibility photocorrosion hinders such applications. Understanding elementary steps of these materials can aid endeavor realizing stable devices. In this Perspective, we discuss both thermodynamic kinetic aspects...

The electrochemical conversion of carbon dioxide (CO2) to high-value chemicals is an attractive approach create artificial cycle. Tuning the activity and product selectivity while maintaining long-term stability, however, remains a significant challenge. Here, we study series Au-Pb bimetallic electrocatalysts with different Au/Pb interfaces, generating monoxide (CO), formic acid (HCOOH), methane (CH4) as CO2 reduction products. formation CH4 because it has only been observed on very few...

While CO can already be produced at industrially relevant current densities via CO2 electrolysis, the selective formation of C2+ products seems challenging. in principle, overcome this barrier, hence forming valuable chemicals from two steps. Here we demonstrate that a mass-produced, commercially available polymeric pore sealer used as catalyst binder, ensuring high rate and reduction. We achieved above 70% faradaic efficiency for j = 500 mA cm-2 density. As no specific interaction between...

Abstract In the search for stable and efficient photocatalysts beyond TiO 2 , tungsten‐based oxide semiconductors silver tungstate (Ag WO 4 ), copper (CuWO zinc (ZnWO ) were prepared using solution combustion synthesis (SCS). The tungsten precursor’s influence on product was of particular relevance to this study, most significant effects are highlighted. Each sample’s photocatalytic activity towards methyl orange degradation studied benchmarked against their respective commercial sample...

The charging of a mesoscopic TiO

Structural modification of 2-dimensional clay nanoparticles led to the development biocompatible antioxidant nanozymes combat intracellular oxidative stress.

Ternary cesium-copper halide pseudo-perovskites are an emerging class of semiconductors in the field optoelectronics. Similarly to metal-halide perovskites, by controlling halide-composition, their emission properties can be fine-tuned. Here, a post-synthetic exchange method was employed alter halide-composition and thus polycrystalline Cs3Cu2Br5 layers.

Abstract Cu₂SnSe₃ (CTSe) shows promise due to its wide solar absorption and tunable band gap, though low efficiency caused by interface recombination crystallinity issues remains a challenge. In this study, systematic facile synthesis method for CTSe nanoparticles (NPs) is demonstrated, accompanied an in‐depth analysis of their growth mechanisms. A comprehensive experimental theoretical investigation conducted explore the structural, compositional, optoelectronic, alignment properties p‐type...

Low‐dimensional copper halides with perovskite–analogue structure are a rapidly growing material family for light‐emitting and X‐ray screening devices. Among them Cs 3 Cu 2 I 5 exhibits exceptional optoelectronic properties (large Stokes shift, high emission yield), due to the strong confinement effect of its 0D structure. However, radioluminescence response energetic ions has only marginally been explored heavy fully ignored detrimental luminescence quenching. Herein, scintillation thin...

Titanium dioxide (TiO2) is often employed as a light absorber, electron-transporting material and catalyst in different energy environmental applications. Heat treatment hydrogen atmosphere generates black TiO2 (b-TiO2), allowing better absorption of visible light, which placed this the forefront research. At same time, also introduces trap states, question whether these states are beneficial or harmful rather controversial depends strongly on application. We combined surface science situ...

We measured the exciton dynamics in van der Waals heterojunctions of transition metal dichalcogenides (TMDCs) and organic semiconductors (OSs). TMDCs OSs are semiconducting materials with rich highly diverse optical electronic properties. Their heterostructures, exhibiting bonding at their interfaces, can be utilized field optoelectronics photovoltaics. Two types heterojunctions, MoS2-pentacene WSe2-pentacene, were prepared by layer transfer 20 nm pentacene thin films as well MoS2 WSe2...

Abstract Herein, the first study on scintillation properties of CsCu 2 X 3 and Cs Cu 5 (where X: Cl − , Br I ) is presented, describing their charged particle‐induced luminescence involving electrons, protons, α‐particles, heavy ions, as well revealing capabilities timing spectroscopic evaluation single‐particle events. The thin layers are prepared with a simple cost‐effective deposition procedure, without incorporation external dopants, exploiting intrinsic radiative recombination observed...