نتایج جستجو برای: perovskites

تعداد نتایج: 4518  

Journal: :Dalton transactions 2015
Nicole A Benedek James M Rondinelli Hania Djani Philippe Ghosez Philip Lightfoot

ABO(3) perovskites have fascinated solid-state chemists and physicists for decades because they display a seemingly inexhaustible variety of chemical and physical properties. However, despite the diversity of properties found among perovskites, very few of these materials are ferroelectric, or even polar, in bulk. In this Perspective, we highlight recent theoretical and experimental studies tha...

Kinetic Monte Carlo simulation was applied to investigation of kinetics and mechanism of oxalic acid degradation by direct and heterogeneous catalytic ozonation. La-containing perovskites including LaFeO3, LaNiO3, LaCoO3 and LaMnO3 was studied as catalyst for oxalic acid ozonation. The reaction kinetic mechanisms of each abovementioned catalytic systems has been achieved. The rate constants val...

2017
Yong Sun Jiajun Peng Yani Chen Yingshan Yao Ziqi Liang

Organo-metal halide perovskites have suffered undesirably from structural and thermal instabilities. Moreover, thermal annealing is often indispensable to the crystallization of perovskites and removal of residual solvents, which is unsuitable for scalable fabrication of flexible solar modules. Herein, we demonstrate the non-thermal annealing fabrication of a novel type of air-stable triple-cat...

Journal: :Inorganic chemistry 2017
Adam H Slavney Rebecca W Smaha Ian C Smith Adam Jaffe Daiki Umeyama Hemamala I Karunadasa

The impressive rise in efficiencies of solar cells employing the three-dimensional (3D) lead-iodide perovskite absorbers APbI3 (A = monovalent cation) has generated intense excitement. Although these perovskites have remarkable properties as solar-cell absorbers, their potential commercialization now requires a greater focus on the materials' inherent shortcomings and environmental impact. This...

Journal: :Journal of the American Chemical Society 2017
Rohit Prasanna Aryeh Gold-Parker Tomas Leijtens Bert Conings Aslihan Babayigit Hans-Gerd Boyen Michael F Toney Michael D McGehee

Tin and lead iodide perovskite semiconductors of the composition AMX3, where M is a metal and X is a halide, are leading candidates for high efficiency low cost tandem photovoltaics, in part because they have band gaps that can be tuned over a wide range by compositional substitution. We experimentally identify two competing mechanisms through which the A-site cation influences the band gap of ...

2016
Adam Jaffe Yu Lin Christine M. Beavers Johannes Voss Wendy L. Mao Hemamala I. Karunadasa

We report the first high-pressure single-crystal structures of hybrid perovskites. The crystalline semiconductors (MA)PbX3 (MA = CH3NH3 (+), X = Br(-) or I(-)) afford us the rare opportunity of understanding how compression modulates their structures and thereby their optoelectronic properties. Using atomic coordinates obtained from high-pressure single-crystal X-ray diffraction we track the pe...

In this study, La–Mn–Cr perovskite-type catalysts were synthesized as LaMnO3,LaCrO3, and LaMn0.5Cr0.5O3 by a microwave-assisted gel-combustion method. They were then calcined at 600oC for 5h in a...

2015
Juan F. Galisteo-López M. Anaya M. E. Calvo H. Míguez

The photophysical properties of films of organic-inorganic lead halide perovskites under different ambient conditions are herein reported. We demonstrate that their luminescent properties are determined by the interplay between photoinduced activation and darkening processes, which strongly depend on the atmosphere surrounding the samples. We have isolated oxygen and moisture as the key element...

Journal: :Advanced materials 2018
Valerio Adinolfi Wei Peng Grant Walters Osman M Bakr Edward H Sargent

Organometal halide perovskites are under intense study for use in optoelectronics. Methylammonium and formamidinium lead iodide show impressive performance as photovoltaic materials; a premise that has spurred investigations into light-emitting devices and photodetectors. Herein, the optical and electrical material properties of organometal halide perovskites are reviewed. An overview is given ...

Journal: :Science 2015
Letian Dou Andrew B Wong Yi Yu Minliang Lai Nikolay Kornienko Samuel W Eaton Anthony Fu Connor G Bischak Jie Ma Tina Ding Naomi S Ginsberg Lin-Wang Wang A Paul Alivisatos Peidong Yang

Organic-inorganic hybrid perovskites, which have proved to be promising semiconductor materials for photovoltaic applications, have been made into atomically thin two-dimensional (2D) sheets. We report the solution-phase growth of single- and few-unit-cell-thick single-crystalline 2D hybrid perovskites of (C4H9NH3)2PbBr4 with well-defined square shape and large size. In contrast to other 2D mat...

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