Facile Fabrication of Highly-Stable and Wavelength-Tunable Tin based Perovskite Materials with Enhanced Quantum Yield via Cation Transformation Reaction

Jia-Ming Meng,1# Zhi-Xian Yang,1# Shivaraj B. Patil,1# Jou-Chun Lin,1# Chen-Hao Yeh,2 Yi-Chia Chen,1 Chih-Wen Pao,3 Jeng-Lung Chen,3 Wun-Yu Chen,4 Chin-Wei Lu,4 Tsung-Rong Kuo,5 Di-Yan Wang1*

just accepted by J. Phys. Chem. Lett.

Metal halide perovskites have attracted great attention for their superior light energy conversion applications. Herein, we demonstrated a facile synthesis of zero-dimensional Sn2+ perovskite Cs4-xMxSnBr6 (M= K+ and Rb+) material through cation transformation reaction at room temperature. Cs4SnBr6 NCs were mixed with pure metal bromide salts (KBr and RbBr) via mechanochemical process to successfully synthesize Cs4-xMxSnBr6 perovskite where transformation of Cs to mixed Cs/Rb and mixed Cs/K was achieved. By substituting different cations, the bright fluorescence of the Cs4-xMxSnBr6 was tuned from dim green to greenish-cyan while achieving the photoluminescence (PL) quantum yield of ~39 %. The crystal structure of Sn based perovskite with the substitution of K+ or Rb+ cations were determined by X-ray diffraction (XRD). Moreover, the Cs4-xMxSnBr6 demonstrated superior air-stability and exhibited a better photocatalytic activity for CO2 reduction reaction (CO2RR) with high selectivity of CH4 gas with higher yield rate compared to the pristine Cs4SnBr6 NCs.

cation exchanging 20807

Facile Fabrication of Highly-Stable and Wavelength-Tunable Tin based Perovskite Materials with Enhanced Quantum Yield via Cation Transformation Reaction

Jia-Ming Meng,1# Zhi-Xian Yang,1# Shivaraj B. Patil,1# Jou-Chun Lin,1# Chen-Hao Yeh,2 Yi-Chia Chen,1 Chih-Wen Pao,3 Jeng-Lung Chen,3 Wun-Yu Chen,4 Chin-Wei Lu,4 Tsung-Rong Kuo,5 Di-Yan Wang1*