Hydrogenated Cs2AgBiBr6 for significantly improved efficiency of lead-free inorganic double perovskite solar cell

Zeyu Zhang, Qingde Sun, Yue Lu (), Feng Lu, Xulin Mu, Su-Huai Wei () and Manling Sui ()
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Zeyu Zhang: Beijing University of Technology
Qingde Sun: Beijing Computational Science Research Center
Yue Lu: Beijing University of Technology
Feng Lu: Nankai University
Xulin Mu: Beijing University of Technology
Su-Huai Wei: Beijing Computational Science Research Center
Manling Sui: Beijing University of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract Development of lead-free inorganic perovskite material, such as Cs2AgBiBr6, is of great importance to solve the toxicity and stability issues of traditional lead halide perovskite solar cells. However, due to a wide bandgap of Cs2AgBiBr6 film, its light absorption ability is largely limited and the photoelectronic conversion efficiency is normally lower than 4.23%. In this text, by using a hydrogenation method, the bandgap of Cs2AgBiBr6 films could be tunable from 2.18 eV to 1.64 eV. At the same time, the highest photoelectric conversion efficiency of hydrogenated Cs2AgBiBr6 perovskite solar cell has been improved up to 6.37% with good environmental stability. Further investigations confirmed that the interstitial doping of atomic hydrogen in Cs2AgBiBr6 lattice could not only adjust its valence and conduction band energy levels, but also optimize the carrier mobility and carrier lifetime. All these works provide an insightful strategy to fabricate high performance lead-free inorganic perovskite solar cells.

Date: 2022
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DOI: 10.1038/s41467-022-31016-w

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