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Achieving high-performance thick-film perovskite solar cells with electron transporting Bingel fullerenes

Yan, Kangrong and Chen, Jiehuan and Ju, Huanxin and Ding, Feizhi and Chen, Hongzheng and Li, Chang-Zhi (2018) Achieving high-performance thick-film perovskite solar cells with electron transporting Bingel fullerenes. Journal of Materials Chemistry A, 6 (32). pp. 15495-15503. ISSN 2050-7488. https://resolver.caltech.edu/CaltechAUTHORS:20180720-103005834

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Abstract

Two Bingel fullerenes, PCP and MCM, as electron transporting materials (ETMs) have been developed for achieving thick-film perovskite solar cells (PVSCs) with efficiencies beyond 19% with a planar absorber layer over 1 micrometer. Almost no PVSCs have exhibited PCEs above 18% with a 1 micrometer planar layer before, owing to the excess perovskite defects deteriorating charge extraction and the performance of thick-film based devices. Benefiting from the nearly identical optoelectronic properties of two ETMs stemming from tailored chemical structures, the studies on them allow us to unveil the fact that subtle molecular interaction (anion–π and Lewis acid–base) between ETMs and perovskites strongly affects the charge extraction at the heterointerface, which in turn influences the device hysteresis and performance. Particularly, weak Lewis base–acid O–Pb^(2+) interaction between MCM and the perovskite helps passivate the trap-states at the interface, resulting in a smooth electron extraction and reduced device hysteresis (the average hysteresis index (HI) of 0.03 ± 0.01). However, the strong N–Pb^(2+) coordination induces misalignment of the energy levels at the perovskite/PCP heterojunction, causing electron accumulation at the junction, and hence the large HI (0.17 ± 0.05) in devices. This work provides new insights into the charge extraction at the perovskite/organic interface and the possible molecular interaction from organics to cure perovskite defects.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://dx.doi.org/10.1039/C8TA05636FDOIArticle
ORCID:
AuthorORCID
Chen, Hongzheng0000-0002-5922-9550
Li, Chang-Zhi0000-0003-1968-2032
Additional Information:© Royal Society of Chemistry 2018. Received 13th June 2018 , Accepted 10th July 2018. First published on 11th July 2018. This research was funded by the National Natural Science Foundation of China (No. 21674093, 51620105006, 21503203 and 51473142), 973 program (No. 2014CB643503), International Science and Technology Cooperation Program of China (ISTCP) (Grant No. 2016YFE0102900), National Key R&D program of China (2017YFA0403403) and Zhejiang Province Science and Technology Plan (No. 2018C01047). C.-Z. Li acknowledges the support from the Zhejiang Natural Science Fund for Distinguished Young Scholars (LR17E030001), the Young 1000 Talents Global Recruitment Program of China, and the 100 Talents Program of Zhejiang University. Authors thank Mr Huanbing Li for FET mobility measurements. K. Yan and J. Chen contributed equally to this work.
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China21674093
National Natural Science Foundation of China51620105006
National Natural Science Foundation of China21503203
National Natural Science Foundation of China51473142
973 Program2014CB643503
International Science and Technology Cooperation Program of China (ISTCP)2016YFE0102900
National Key Research and Development Program of China2017YFA0403403
Zhejiang Province Science and Technology Plan2018C01047
Zhejiang Natural Science Fund for Distinguished Young ScholarsLR17E030001
Young 1000 Talents Global Recruitment Program of ChinaUNSPECIFIED
Zhejiang UniversityUNSPECIFIED
Issue or Number:32
Record Number:CaltechAUTHORS:20180720-103005834
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180720-103005834
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88055
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:23 Jul 2018 14:56
Last Modified:03 Oct 2019 20:02

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