Enhancing the Photoluminescence and Stability of Methylammonium Lead Halide Perovskite Nanocrystals with Phenylalanine
文献类型： 外文期刊
作者： Liu, Li 1 ; Xu, Ke 2 ; Allen, A' Lester 2 ; Li, Xueming 4 ; Xia, Hong 1 ; Peng, Lijun 1 ; Zhang, Jin Z. 2 ;
作者机构： 1.Hubei Acad Agr Sci, Res Inst Agr Qual Stand & Testing Technol, Wuhan 430064, Hubei, Peoples R China
2.Univ Calif Santa Cruz, Dept Chem & Biochem, Santa Cruz, CA 95064 USA
3.Hubei Key Lab Nutr Qual & Safety Agro Prod, Wuhan 430064, Hubei, Peoples R China
4.Chongqing Univ, Coll Chem & Chem Engn, Chongqing 401331, Sichuan, Peoples R China
期刊名称：JOURNAL OF PHYSICAL CHEMISTRY C （ 影响因子：4.126； 五年影响因子：4.467 ）
ISSN： 1932-7447
年卷期： 2021 年 125 卷 4 期
页码：
收录情况： SCI
摘要： The choice of ligand is an important parameter in the synthesis of metal halide perovskites such as methylammonium lead bromide (MAPbBr(3)) perovskite nanocrystals (PNCs). In this work, phenylalanine (Phe) was demonstrated, for the first time, as a highly effective capping ligand for synthesizing MAPbBr(3) PNCs when used in conjunction with (3-aminopropyl) triethoxysilane (APTES) and oleic acid (OA) or methylphosphoric acid (MPA). Ultraviolet-visible absorption and photoluminescence (PL) emission spectroscopy, powder X-ray diffraction, and Fourier transform infrared spectroscopy were used to investigate the optoelectronic, structural, and surface properties of the PNCs. The combined use of Phe, APTES, and OA or MPA is demonstrated to be highly successful in passivating PNCs for achieving both improved PL and enhanced stability. The enhanced passivation by Phe is attributed to the three functional groups in Phe that can stabilize surface defects related to Pb2+, CH3NH3+, and Br- by mediating pH and hydrophobicity. Based on all the experimental results, a model is proposed to explain the passivation mechanism involving Phe in conjunction with other amine and acid ligands. This study demonstrates the effectiveness of multiligand passivation of perovskites involving amino acid as the capping ligand.
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