# A Bismuth-Halide Double Perovskite with Long Carrier Recombination Lifetime for Photovoltaic Applications

“A Bismuth-Halide Double Perovskite with Long Carrier Recombination Lifetime for Photovoltaic Applications” (2016), by Adam H. Slavney et al. Engineering research paper. Original abstract below, unchanged. No free PDF was found.

- Authors: Adam H. Slavney, Te Hu, Aaron M. Lindenberg, Hemamala I. Karunadasa
- Published: February 7, 2016
- Field: Engineering
- DOI: https://doi.org/10.1021/jacs.5b13294
- Source: https://doi.org/10.1021/jacs.5b13294

## 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 Bi(3+) 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 halide double perovskites for photovoltaics and other optoelectronics.

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