Journal Article10.1021/JACS.5B13294
A Bismuth-Halide Double Perovskite with Long Carrier Recombination Lifetime for Photovoltaic Applications
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TL;DR: The double-perovskites are used to incorporate nontoxic Bi(3+) into the perovskite lattice in Cs2AgBiBr6 (1), which shows a long room-temperature fundamental photoluminescence (PL) lifetime and comparison between single-crystal and powder PL decay curves of 1 suggests inherently high defect tolerance.
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Abstract: Despite the remarkable rise in efficiencies of solar cells containing the lead-halide perovskite absorbers RPbX3 (R = organic cation; X = Br– or I–), the toxicity of lead remains a concern for the large-scale implementation of this technology. This has spurred the search for lead-free materials with similar optoelectronic properties. Here, we use the double-perovskite structure to incorporate nontoxic Bi3+ into the perovskite lattice in Cs2AgBiBr6 (1). The solid shows a long room-temperature fundamental photoluminescence (PL) lifetime of ca. 660 ns, which is very encouraging for photovoltaic applications. Comparison between single-crystal and powder PL decay curves of 1 suggests inherently high defect tolerance. The material has an indirect bandgap of 1.95 eV, suited for a tandem solar cell. Furthermore, 1 is significantly more heat and moisture stable compared to (MA)PbI3. The extremely promising optical and physical properties of 1 shown here motivate further exploration of both inorganic and hybrid hal...
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Citations
Origin of ultra-low lattice thermal conductivity in Cs2BiAgX6 (X=Cl, Br) and its impact on thermoelectric performance
Enamul Haque,M. Anwar Hossain +1 more
TL;DR: In this paper, the authors explored electronic and thermoelectric properties of bismuth-based double-perovskite halides Cs2BiAgX6 (X = Cl, Br) by using first principles calculations.
106
Research Update: Bismuth-based perovskite-inspired photovoltaic materials
TL;DR: Bismuth-based compounds have recently gained interest as solar absorbers with the potential to have low toxicity, be efficient in devices, and be processable using facile methods as mentioned in this paper.
106
Dual-Ion-Diffusion Induced Degradation in Lead-Free Cs2AgBiBr6 Double Perovskite Solar Cells
Mehri Ghasemi,Lei Zhang,Jung-Ho Yun,Mengmeng Hao,Dongxu He,Peng Chen,Yang Bai,Tongen Lin,Mu Xiao,Aijun Du,Miaoqiang Lyu,Lianzhou Wang +11 more
TL;DR: In this article, the authors investigated the dual-ion migration phenomenon in lead-free double perovskite solar cells and proposed a possible mechanism involving a vacancy-mediated ion-migration.
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