Room temperature synthesis of lead-free FASnI3 perovskite nanocrystals with improved stability by SnF2 additive

被引:7
作者
Chen, Zeying [1 ,2 ]
Dhakal, Tara P. P. [1 ,2 ,3 ]
机构
[1] SUNY Binghamton, Ctr Autonomous Solar Power CASP, Vestal, NY 13850 USA
[2] SUNY Binghamton, Mat Sci & Engn Program, Vestal, NY 13850 USA
[3] SUNY Binghamton, Dept Elect & Comp Engn, Vestal, NY 13850 USA
基金
美国国家科学基金会;
关键词
SOLAR-CELLS; QUANTUM DOTS; RE-PRECIPITATION; PHOTOLUMINESCENCE; PERFORMANCE; FABRICATION;
D O I
10.1063/5.0125100
中图分类号
O59 [应用物理学];
学科分类号
摘要
Tin halide perovskites are among the candidates for replacing lead-based ones for less toxicity and comparable optical properties. However, stability remains a challenge due to the easier oxidation of Sn2+ than Pb2+. Here, for the first time, we applied the ligand-assisted reprecipitation method to synthesize CH(NH2)(2)SnI3 (FASnI(3)) orthorhombic perovskite nanocrystals with an average diameter of 7.7 nm and a photoluminescence emission at 825 & PLUSMN; 2 nm (1.5 eV). The influence of synthesis parameters, including precursor solvent, precipitation media, temperature, and time on optical properties of nanocrystals, was studied. By incorporating SnF2, the stability of the nanocrystals was improved, and the oxidation from FASnI(3) to FA(2)SnI(6) was significantly delayed, which was quantitively demonstrated and confirmed by observing the characteristic diffraction peaks of the perovskite phase using x-ray diffraction at various exposure time to air. The addition of SnF2 is optimized to be 6%. The FASnI(3) nanocrystals stayed stable for at least 265 days under N-2 storage at room temperature and relative humidity of 20%.
引用
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页数:8
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