纳米晶
锡
钙钛矿(结构)
光致发光
化学
胶体
纳米技术
量子产额
化学工程
激子
材料科学
光电子学
结晶学
物理化学
有机化学
物理
工程类
量子力学
荧光
作者
Yusheng Li,Dandan Wang,Yongge Yang,Chao Ding,Yuyu Hu,Feng Liu,Yuyao Wei,Dong Liu,Hua Li,Guozheng Shi,Shikai Chen,Hongshi Li,Akihito Fuchimoto,Kazuya Tosa,Unno Hiroki,Shuzi Hayase,Huiyun Wei,Qing Shen
摘要
Inorganic tin (Sn) perovskite nanocrystals offer a promising solution to the potential toxicity concerns associated with their established lead (Pb)-based counterparts. Yet, achieving their superior stability and optoelectronic properties remains an ongoing challenge. Here, we report a synthesis of high-symmetry α-phase CsSnI3 nanocrystals with an ultralong 278 ns carrier lifetime, exceeding previous benchmarks by 2 orders of magnitude through meticulous Sn(IV) control. The nanocrystals demonstrate excellent colloidal stability, uniform monodispersity, and a distinct exciton peak. Central to these outcomes is our designed solid–liquid antioxidation suspension of tri-n-octylphosphine (TOP) and zerovalent tin (Sn(0)) that fully addresses the unique coexisting oxygen-driven and solvent-driven Sn oxidation mechanisms in Sn perovskite nanocrystal synthesis. We uncover the largely undervalued function of TOP in mitigating oxygen-driven Sn oxidation and introduce Sn(0) powder to generate a synergistic antioxidation function with TOP, significantly reducing Sn(IV)-induced defects and distortions and contributing to enhanced optoelectronic properties. Strikingly, this approach also profoundly impacts inorganic Sn–Pb perovskite nanocrystals, boosting lifetimes by 2 orders of magnitude and increasing photoluminescence quantum yield over 100-fold to 35%. Our findings illuminate the potential of Sn-based nanocrystals for optoelectronic applications.
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