期刊
NANO LETTERS
卷 17, 期 11, 页码 6863-6869出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b03179
关键词
Mixed-halide perovskite; halide migration; phase separation; LEDs; solar cells
类别
资金
- DARPA Young Faculty Award [D15AP00093]
- ONR Young Investigator Program [N00014-17-1-2005]
- DuPont Young Professor Award
One merit of organic-inorganic hybrid perovskites is their tunable bandgap by adjusting the halide stoichiometry, an aspect critical to their application in tandem solar cells, wavelength-tunable light emitting diodes (LEDs), and lasers. However, the phase separation of mixed-halide perovskites caused by light or applied bias results in undesirable recombination at iodide-rich domains, meaning open-circuit voltage (V-oc) pinning in solar cells and infrared emission in LEDs. Here, we report an approach to suppress halide redistribution by self-assembled long-chain organic ammonium capping layers at nanometer-sized grain surfaces. Using the stable mixed-halide perovskite films, we are able to fabricate efficient and wavelength-tunable perovskite LEDs from infrared to green with high external quantum efficiencies of up to 5%, as well as linearly tuned V-oc from 1.05 to 1.45 V in solar cells.
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