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. 2017 Nov 8;17(11):6863-6869.
doi: 10.1021/acs.nanolett.7b03179. Epub 2017 Oct 5.

Mixed-Halide Perovskites with Stabilized Bandgaps

Zhengguo Xiao  1 , Lianfeng Zhao  1 , Nhu L Tran  1 , Yunhui Lisa Lin  1 , Scott H Silver  1 , Ross A Kerner  1 , Nan Yao  1 , Antoine Kahn  1 , Gregory D Scholes  1 , Barry P Rand  1
Affiliations

Mixed-Halide Perovskites with Stabilized Bandgaps

Zhengguo Xiao et al. Nano Lett. .

Abstract

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 (VOC) 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 VOC from 1.05 to 1.45 V in solar cells.

Keywords: LEDs; Mixed-halide perovskite; halide migration; phase separation; solar cells.

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