Perovskite-fullerene hybrid materials suppress hysteresis in planar diodes
- 등재 SCIE, SCOPUS
- 발행기관 Nature Publishing Group
- 발행년도 2015
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000115758
- 본문언어 영어
- Published As http://dx.doi.org/10.1038/ncomms8081
- 저작권 이화여자대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Solution-processed planar perovskite devices are highly desirable in a wide variety of optoelectronic applications; however, they are prone to hysteresis and current instabilities. Here we report the first perovskite-PCBM hybrid solid with significantly reduced hysteresis and recombination loss achieved in a single step. This new material displays an efficient electrically coupled microstructure: PCBM is homogeneously distributed throughout the film at perovskite grain boundaries. The PCBM passivates the key PbI<inf>3</inf>- antisite defects during the perovskite self-assembly, as revealed by theory and experiment. Photoluminescence transient spectroscopy proves that the PCBM phase promotes electron extraction. We showcase this mixed material in planar solar cells that feature low hysteresis and enhanced photovoltage. Using conductive AFM studies, we reveal the memristive properties of perovskite films. We close by positing that PCBM, by tying up both halide-rich antisites and unincorporated halides, reduces electric field-induced anion migration that may give rise to hysteresis and unstable diode behaviour. © 2015 Macmillan Publishers Limited. All rights reserved.
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