نتایج جستجو برای: based perovskites
تعداد نتایج: 2938220 فیلتر نتایج به سال:
Abstract Mn-based catalysts for soot oxidation have been developed without noble metals. The compositions are LaMn 0.9 Co 0.1 O 3 , La K Mn (LKMC), Sr and K/La : provides stability to the structure both in oxidizing reducing atmospheres efficiently exchanges oxygen. Moreover, doping enhances oxidation. Adding or as A-site cation perovskite composition allows comparing behaviors of so-obtained p...
Lead halide perovskites have been demonstrated as high performance materials in solar cells and light-emitting devices. These materials are characterized by coherent band transport expected from crystalline semiconductors, but dielectric responses and phonon dynamics typical of liquids. This "crystal-liquid" duality implies that lead halide perovskites belong to phonon glass electron crystals, ...
The Perdew-Burke-Ernzerhof generalized gradient approximation to the density functional theory is tested with respect to sensitivity to the choice of the value of the parameter κ, which is associated to the degree of localization of the exchange-correlation hole. A study of structural and dynamical properties of four selected ferroelectric perovskites is presented. The originally proposed value...
Impressive performance of hybrid perovskite solar cells reported in recent years still awaits a comprehensive understanding of its microscopic origins. In this work, the intrinsic Hall mobility and photocarrier recombination coefficient are directly measured in these materials in steady-state transport studies. The results show that electron-hole recombination and carrier trapping rates in hybr...
The large photocurrent hysteresis observed in many organometal trihalide perovskite solar cells has become a major hindrance impairing the ultimate performance and stability of these devices, while its origin was unknown. Here we demonstrate the trap states on the surface and grain boundaries of the perovskite materials to be the origin of photocurrent hysteresis and that the fullerene layers d...
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