研究目的
Investigating the effect of heterovalent-metal doping in two-dimensional tin-based halide perovskite single crystals to tailor their optoelectronic properties.
研究成果
Bi-doped lead-free two-dimensional perovskite PEA2SnBr4 single crystals exhibit tunable PL behaviors, with the incorporation of Bi promoting the formation of nonradiative extrinsic self-trapped excitons. This study provides insights into the role of heterovalent doping in tailoring the optoelectronic properties of two-dimensional perovskites.
研究不足
The study focuses on Bi-doped PEA2SnBr4 single crystals, and the findings may not be directly applicable to other perovskite materials or doping strategies. The PL quantum yield is relatively low, indicating potential areas for optimization in doping concentration and crystal quality.
1：Experimental Design and Method Selection:
Cooling-induced crystallization method was used to synthesize Bi-doped PEA2SnBr4 single crystals.
2：Sample Selection and Data Sources:
Single crystals were fabricated by mixing PEABr and SnBr2 with BiBr3 in HBr and H3PO2 solutions.
3：List of Experimental Equipment and Materials:
PANalytical Empyrean for X-ray analysis, Perkin Elmer 7300 DV ICP-OES for molar ratio determination, Shimadzu Uv 2550 spectrometer for optical diffuse reflectance spectra, Horiba PTI QuantaMaster 400 for PL spectra, JEOL JSM-7800F FESEM for surface morphology analysis, Hamamatsu C11347 for PLQE measurement, Spectra Physics laser system for fs TA measurement.
4：Experimental Procedures and Operational Workflow:
The solution was stirred at 120 oC for 1 h, cooled to room temperature, washed with ethanol, and dried in vacuum.
5：Data Analysis Methods:
Global analysis with a parallel model was performed to yield decay-associated difference spectra (DADS).
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