Controlling Photoluminescence and Photocatalysis Activities in Lead-Free Cs₂Pt_xSn_1−xCl₆ Perovskites via Ion Substitution

Summary, in English

Lead-free halide perovskites have triggered interest in the field of optoelectronics and photocatalysis because of their low toxicity, and tunable optical and charge-carrier properties. From an application point of view, it is desirable to develop stable multifunctional lead-free halide perovskites. We have developed a series of Cs₂Pt_xSn_1−xCl₆ perovskites (0≤x≤1) with high stability, which show switchable photoluminescence and photocatalytic functions by varying the amount of Pt⁴⁺ substitution. A Cs₂Pt_xSn_1−xCl₆ solid solution with a dominant proportion of Pt⁴⁺ shows broadband photoluminescence with a lifetime on the microsecond timescale. A Cs₂Pt_xSn_1−xCl₆ solid solution with a small amount of Pt⁴⁺ substitution exhibits photocatalytic hydrogen evolution activity. An optical spectroscopy study reveals that the switch between photoluminescence and photocatalysis functions is controlled by sub-band gap states. Our finding provides a new way to develop lead-free multifunctional halide perovskites with high stability.

• Author: Hang Yin; Junsheng Chen; Peng Guan; Daoyuan Zheng; Qingkun Kong; Songqiu Yang; Panwang Zhou; Bin Yang; Tönu Pullerits; Keli Han
• Department/s: Chemical Physics; NanoLund: Centre for Nanoscience
• Publishing year: 2021
• Language: English
• Pages: 22693-22699
• Publication/Series: Angewandte Chemie - International Edition
• Volume: 60
• Issue: 42
• Links: http://dx.doi.org/10.1002/anie.202108133
• Document type: Journal article
• Publisher: John Wiley & Sons Inc.
• Topic: Physical Chemistry (including Surface- and Colloid Chemistry); Condensed Matter Physics (including Material Physics, Nano Physics)
• Keywords: charge-carrier dynamics; lead-free perovskite; photocatalysis; photoluminescence; sub-band gap
• Status: Published
• ISBN/ISSN/Other: ISSN: 1433-7851