Results 61 to 70 of about 2,536,814 (333)

Small‐Band‐Gap Halide Double Perovskites

Angewandte Chemie, 2018
AbstractDespite their compositional versatility, most halide double perovskites feature large band gaps. Herein, we describe a strategy for achieving small band gaps in this family of materials. The new double perovskites Cs2AgTlX6 (X=Cl (1) and Br (2)) have direct band gaps of 2.0 and 0.95 eV, respectively, which are approximately 1 eV lower than ...
Adam H. Slavney, Linn Leppert, Abraham Saldivar Valdes, Davide Bartesaghi, Tom J. Savenije, Jeffrey B. Neaton, Hemamala I. Karunadasa   +6 more
openaire   +4 more sources

Enhancing the photophysical properties of absorption and luminescence in lightly doped halide double perovskite nanomaterials (Cs2Ag1-aBi1-bPbxBr6): Theory and experiment

Next Materials
Lead-free halide double perovskites, such as Cs2AgBiX6, have emerged as less toxic alternatives to the lead-based solar cell absorbers, APbX3 (where A is a monovalent cation and X is halide). Despite their potential application in photovoltaics and x-ray
Celal Kursun, Mohammed Mehedi Hasan, Alamgir Kabir, Ismahan Duz Parrey, Khursheed Ahmad Parrey   +4 more
doaj   +1 more source

Review on Fe-based double perovskite cathode materials for solid oxide fuel cells

Energy Materials
As a clean and efficient energy conversion device, solid oxide fuel cells have been garnering attention due to their environmentally friendly and fuel adaptability. Consequently, they have become one of the current research directions of new energy.
Manyi Xie, Changkun Cai, Xingyu Duan, Ke Xue, Hong Yang, Shengli An   +5 more
semanticscholar   +1 more source

Organic Molecule Assisted Growth of Perovskite Films Consisting of Square Grains by Surface-Confined Process

Nanomaterials, 2021
Organic–inorganic perovskite single crystals are promising in the field of optoelectronics due to their excellent optoelectronic properties. However, the ion transport of perovskite precursor is poor in confined spaces, which results in difficulty in the
Shao Xin Yan, Chang Bao Han, Jianhua Huang, Yichuan Chen, Xiaobo Zhang, Xiaoqing Chen, Yongzhe Zhang, Hui Yan   +7 more
doaj   +1 more source

Damping of antiferromagnetic spin waves by valence fluctuations in the double layer perovskite YBaFe2O5

, 2007
Inelastic neutron scattering experiments show that spin dynamics in the charge ordered insulating ground state of the double-layer perovskite YBaFe2O5 is well described in terms of eg superexchange interactions. Above the Verwey transition at TV = 308 K,
F. R. Trouw, M. P. Hehlen, P. Karen, R. J. McQueeney, S. Chang, W. A. Harrison   +5 more
core   +1 more source

Design of new Mott multiferroics via complete charge transfer: promising candidates for bulk photovoltaics

Scientific Reports, 2017
Optimal materials to induce bulk photovoltaic effects should lack inversion symmetry and have an optical gap matching the energies of visible radiation.
Hanghui Chen, Andrew Millis
doaj   +1 more source

Topological magnetic phase in LaMnO$_3$ (111) bilayer

, 2015
Candidates for correlated topological insulators, originated from the spin-orbit coupling as well as Hubbard type correlation, are expected in the ($111$) bilayer of perovskite-structural transition-metal oxides. Based on the first-principles calculation
Dong, Shuai, Huang, Xin, Weng, Yakui, Yao, Yugui   +3 more
core   +1 more source

Theoretical Analysis of Power Conversion Efficiency of Lead-Free Double-Perovskite Cs₂TiBr₆ Solar Cells with Different Hole Transport Layers

Eng
In recent years, there has been significant investigation into the high efficiency of perovskite solar cells. These cells have the capacity to attain efficiencies above 14%.
Vivek Bhojak, Praveen Kumar Jain
doaj   +1 more source

Investigations of Lead Free Halides in Sodium Based Double Perovskites Cs2NaBiX6(X=Cl, Br, I): an Ab Intio Study

East European Journal of Physics, 2021
Despites the excellent merits of lead based perovskite optoelectronic devices; their unstable nature and toxicity still present a bottleneck for practical applications.
Shaily Choudhary, Shalini Tomar, Depak Kumar, Sudesh Kumar, Ajay Singh Verma   +4 more
doaj   +1 more source

Identification of Free and Bound Exciton States and Their Phase-Dependent Trapping Behavior in Lead Halide Perovskites

, 2017
In this work we probe the sub-gap energy states within polycrystalline and single crystal lead halide perovskites to better understand their intrinsic photophysics behaviors.
Jasieniak, Jacek J., Li, Dongmei, Li, Yiming, Li, Yusheng, Luo, Yanhong, Meng, Qingbo, Shi, Jiangjian, Wu, Huijue, Zhang, Huiyin   +8 more
core   +1 more source