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Perovskite-fullerene hybrid materials suppress hysteresis in planar diodese

Title
Perovskite-fullerene hybrid materials suppress hysteresis in planar diodese
Authors
Xu, JixianBuin, AndreiIp, Alexander H.Li, WeiVoznyy, OleksandrComin, RiccardoYuan, MingjianJeon, SeokminNing, ZhijunMcDowell, Jeffrey J.Kanjanaboos, PongsakornSun, Jon-PaulLan, XinzhengQuan, Li NaKim, Dong HaHill, Ian G.Maksymovych, PeterSargent, Edward H.
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2015
Journal Title
NATURE COMMUNICATIONS
ISSN
2041-1723JCR Link
Citation
vol. 6
Publisher
NATURE PUBLISHING GROUP
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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 PbI3- 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.
DOI
10.1038/ncomms8081
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자연과학대학 > 화학·나노과학전공 > Journal papers
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