Near‐infrared light‐responsive Cu‐doped Cs2AgBiBr6

0536344 - ÚMCH 2021 RIV DE eng J - Journal Article
Ji, F. - Huang, Y. - Wang, F. - Kobera, Libor - Xie, F. - Klarbring, J. - Abbrent, Sabina - Brus, Jiří - Yin, C. - Simak, S. I. - Abrikosov, I. A. - Buyanova, I. A. - Chen, W. M. - Gao, F.
Near‐infrared light‐responsive Cu‐doped Cs2AgBiBr6.
Advanced Functional Materials. Roč. 30, č. 51 (2020), s. 1-7, č. článku 2005521. ISSN 1616-301X. E-ISSN 1616-3028
R&D Projects: GA ČR(CZ) GA19-05259S
Institutional support: RVO:61389013
Keywords : Cu doping * lead-free double perovskites * near-infrared absorption
OECD category: Analytical chemistry
Impact factor: 18.808, year: 2020
Method of publishing: Open access
https://onlinelibrary.wiley.com/doi/10.1002/adfm.202005521

Lead‐free halide double perovskites (A2BIBIIIX6) with attractive optical and electronic features are considered to be a promising candidate to overcome the toxicity and stability issues of lead halide perovskites (APbX3). However, their poor absorption profiles limit device performance. Here the absorption band edge of Cs2AgBiBr6 double perovskite to the near‐infrared range is significantly broadened by developing doped double perovskites, Cs2(Ag:Cu)BiBr6. The partial replacement of Ag ions by Cu ions in the crystal lattice is confirmed by the X‐ray photoelectron spectroscopy (XPS) and solid‐state nuclear magnetic resonance (ssNMR) measurements. Cu doping barely affects the bandgap of Cs2AgBiBr6, instead it introduces subbandgap states with strong absorption to the near‐infrared range. More interestingly, the near‐infrared absorption can generate band carriers upon excitation, as indicated by the photoconductivity measurement. This work sheds new light on the absorption modulation of halide double perovskites for future efficient optoelectronic devices.
Permanent Link: http://hdl.handle.net/11104/0314359