卤化铅钙钛矿纳米晶体中与尺寸和卤化物相关的俄歇复合
Size- and Halide-Dependent Auger Recombination in Lead Halide Perovskite Nanocrystals.
作者信息
Li Yulu, Luo Xiao, Ding Tao, Lu Xin, Wu Kaifeng
机构信息
State Key Laboratory of Molecular Reaction Dynamics, Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 116023, China.
Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, China.
出版信息
Angew Chem Int Ed Engl. 2020 Aug 17;59(34):14292-14295. doi: 10.1002/anie.202004668. Epub 2020 Jul 3.
Lead halide perovskite nanocrystals (NCs) hold strong promise for a variety of light-harvesting, emitting, and detecting applications, all of which, however, could be complicated by multicarrier Auger recombination. Therefore, complete documentation of the size- and composition-dependent Auger recombination rates of these NCs is highly desirable, as it can guide system design in many applications. Herein we report the synthesis and Auger measurements of monodisperse APbX (A=Cs and FA; X=Cl, Br, and I) NCs in an extensive size range (ca. 3-9 nm). The biexciton Auger lifetime of all the NCs scales linearly with the NC volume. The scaling coefficient is virtually independent of the cation but rather depends sensitively on the anion, and is 0.035, 0.085, and 0.142 ps nm for Cl, Br, and I, respectively. In all of these nanocrystals the Auger recombination is much faster than in standard CdSe and PbSe NCs (ca. 1 ps nm ).
卤化铅钙钛矿纳米晶体（NCs）在各种光捕获、发光和检测应用中有着巨大的前景，然而，所有这些应用都可能因多载流子俄歇复合而变得复杂。因此，非常需要完整记录这些纳米晶体尺寸和成分依赖的俄歇复合率，因为它可以指导许多应用中的系统设计。在此，我们报告了在广泛尺寸范围（约3 - 9 nm）内单分散APbX（A = Cs和FA；X = Cl、Br和I）纳米晶体的合成及俄歇测量。所有纳米晶体的双激子俄歇寿命与纳米晶体体积呈线性关系。缩放系数实际上与阳离子无关，而是敏感地依赖于阴离子，对于Cl、Br和I，分别为0.035、0.085和0.142 ps nm 。在所有这些纳米晶体中，俄歇复合比标准CdSe和PbSe纳米晶体（约1 ps nm ）快得多。
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