Abstract
Single crystal (SC) MAPbBr3 perovskite is regarded as a promising material to fabricate high-performance photodetectors (PDs) due to its impressive optoelectronic properties and good chemical stability. Rb+ doping has been proved to be an effective method to significantly improve the optoelectronic properties of MAPbBr3 SC. However, the intrinsic effect of Rb+ on the crystal structure is still unclear. Herein, Rb-doping enhances optoelectronic performance of RbxMA(1−x)PbBr3 single crystals by lattice relaxation effect was proved. The density functional theory (DFT) calculations demonstrate that Rb-doping leads to lattice relaxation effect which is benefit to reduce trap density of RbxMA(1−x)PbBr3 SCs. And then a series RbxMA(1−x)PbBr3 SCs were grown. X-ray rocking curves (XRC) of RbxMA(1−x)PbBr3 SCs prove that appropriate Rb-doping concentration could reduce defect density effectively. X-ray photoelectron spectroscopy (XPS) measurements indicate that Rb-doping enhances the atoms interaction in RbxMA(1−x)PbBr3 lattice. Single-crystal PDs were fabricated to compare the optoelectronic properties of MAPbBr3 SCs with different Rb-doping concentration, and the 2% Rb-doped RbxMA(1−x)PbBr3 PD shows the optimum performance.
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09 February 2022
A Correction to this paper has been published: https://doi.org/10.1007/s10854-022-07859-w
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Acknowledgements
This work was supported by the fund for talent of Guangxi province, (Nos. T3120099202, T3120097921, C31200992001), Talent Model Base (AD19110157), Disinfection Robot Based on High Power AlGaN-based UVLEDs (No. BB31200014), Guangxi Science and Technology Program (AD19245132, AD20238093), and Guangxi University Foundation (A3120051010), China.
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YW and WHS conceived the idea. XQ and LL designed the experiments. XQ and LL carried out the device fabrication. LL and XQ carried out electrical characterizations. XQ, LL, LH,.and GL carried out the optical characterizations. LL carried out DFT calculations. All the authors analyzed and interpreted the data and wrote the paper.
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Qiu, X., Li, L., Li, G. et al. Lattice relaxation effect in RbxMA(1−x)PbBr3 single crystal to enhance optoelectronic performance of perovskite photodetectors. J Mater Sci: Mater Electron 33, 3438–3451 (2022). https://doi.org/10.1007/s10854-021-07396-y
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DOI: https://doi.org/10.1007/s10854-021-07396-y