نتایج جستجو برای: based perovskites

تعداد نتایج: 2938220  

2018
Gergely F. Samu Rebecca A. Scheidt Prashant V. Kamat Csaba Janáky

The unique optoelectronic properties of lead halide perovskites have triggered a new wave of excitement in materials chemistry during the past five years. Electrochemistry, spectroelectrochemistry, and photoelectrochemistry could be viable tools both for analyzing the optoelectronic features of these materials and for assembling them into hybrid architectures (e.g., solar cells). At the same ti...

2017
M. Ezbiri M. Takacs D. Theiler R. Michalsky A. Steinfeld

Nonstoichiometric metal oxides with variable valence are attractive redox materials for thermochemical and electrochemical fuel processing. To guide the design of advanced redox materials for solar-driven splitting of CO2 and/or H2O to produce CO and/or H2 (syngas), we investigate the equilibrium thermodynamics of the LaxSr1 xMnyAl1 yO3 d perovskite family (0 # x # 1, 0 # y # 1) and La0.6Ca0.4M...

2017
Kiyoshi Miyata Daniele Meggiolaro M Tuan Trinh Prakriti P Joshi Edoardo Mosconi Skyler C Jones Filippo De Angelis X-Y Zhu

Lead halide perovskites show marked defect tolerance responsible for their excellent optoelectronic properties. These properties might be explained by the formation of large polarons, but how they are formed and whether organic cations are essential remain open questions. We provide a direct time domain view of large polaron formation in single-crystal lead bromide perovskites CH3NH3PbBr3 and C...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2002
John P Brodholt A R Oganov G D Price

The inherent uncertainties in modern first-principles calculations are reviewed using geophysically relevant examples. The elastic constants of perovskite at lower-mantle temperatures and pressures are calculated using ab initio molecular dynamics. These are used in conjunction with seismic tomographic models to estimate that the lateral temperature contrasts in the Earth's lower mantle are 800...

2004
J. Nuss E. Pavarini S. Biermann A. Georges A. I. Lichtenstein

Transition metal perovskites have been studied for decades because of their unusual electronic and magnetic properties arising from narrow 3d bands and strong Coulomb correlations. The 3d1 perovskites are particularly interesting since despite the lack of multiplet effects similar materials have very different electronic properties: strontium and calcium vanadate are correlated metals with mass...

Journal: :Science 2017
Phillip Szuromi Brent Grocholski

Journal: :Chemical communications 2015
Lidón Gil-Escrig Giulia Longo Antonio Pertegás Cristina Roldán-Carmona A Soriano Michele Sessolo Henk J Bolink

Planar diode structures employing hybrid organic-inorganic methylammonium lead iodide perovskites lead to multifunctional devices exhibiting both a high photovoltaic efficiency and good electroluminescence. The electroluminescence strongly improves at higher current density applied using a pulsed driving method.

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