期刊
NANO LETTERS
卷 20, 期 11, 页码 8151-8156出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03204
关键词
halide perovskite; nanowire heterostructure; anion exchange; solid-state ionic rectification; vacancy-driven ion migration and interdiffusion
类别
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-05-CH11231, KC3103]
- NSF [DBI0116016]
- National Institutes of Health S10 Program [1S10RR026866-01]
- U.S. Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
- Suzhou Industrial Park
- Energy & Environment Solutions I-Site (E2S-UPPA)
Halide perovskites have attracted increasing research attention with regard to their potential for optoelectronic applications. Because of its low activation energy, ion migration is implicated in the long-term stability and many unusual transport behaviors of halide perovskite devices. However, direct observation and precise control of the ionic transport in halide perovskite crystals remain challenging. Here, we have designed an axial CsPbBr3 -CsPbCl3 nanowire heterostructure, in which electric-field-induced halide ion migration was clearly visualized and quantified. We demonstrated that halide ion migration is dependent on the applied electric field and exhibits ionic rectification in this solid-state system, which is due to the nonuniform distribution of the ionic vacancies in the nanowire that results from a competition between electrical screening and their creation/destruction at the electrodes' interfaces. The asymmetric heterostructure characteristics add an additional knob to control the ion movement in the design of advanced ionic circuits with halide perovskites as building blocks.
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