期刊
ACS NANO
卷 13, 期 6, 页码 6955-6962出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b01907
关键词
layered perovskites; large nanosheets; energy funneling; hot-injection; lead halide precursors
类别
资金
- German Research Foundation DFG [KL 1453/9-2]
- European Research Council [304980]
- MINECO (Spain) [MAT2016-81118-P]
Hybrid lead halide perovskites with 2D stacking structures have recently emerged as promising materials for optoelectronic applications. We report a method for growing 2D nanosheets of hybrid lead halide perovskites (I, Br and Cl), with tunable lateral sizes ranging from 0.05 to 8 mu m and a structure consisting of n stacked monolayers separated by long alkylamines, tunable from bulk down to n = 1. The key to obtaining such a wide range of perovskite properties hinged on utilizing the respective lead halide nanosheets as precursors in a hot-injection synthesis that afforded careful control over all process parameters. The layered, quantum-confined (n <= 4) nanosheets were comprised of major and minor fractions with differing n. Energy funneling from low to high n (high to low energy) regions within a single sheet, mediated by the length of the ligands between stacks, produced photoluminescent quantum yields as high as 49%. These large, tunable 2D nanosheets could serve as convenient platforms for future high-efficiency optoelectronic devices.
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