Matching Charge Extraction Contact for Wide‐Bandgap Perovskite Solar Cells

Efficient wide‐bandgap (WBG) perovskite solar cells are needed to boost the efficiency of silicon solar cells to beyond Schottky–Queisser limit, but they suffer from a larger open circuit voltage (VOC) deficit than narrower bandgap ones. Here, it is shown that one major limitation of VOC in WBG pero...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2017-07, Vol.29 (26), p.n/a
Main Authors: Lin, Yuze, Chen, Bo, Zhao, Fuwen, Zheng, Xiaopeng, Deng, Yehao, Shao, Yuchuan, Fang, Yanjun, Bai, Yang, Wang, Chunru, Huang, Jinsong
Format: Article
Language:English
Subjects:
Buckminsterfullerene
Charge transport
Energy conversion efficiency
Energy levels
fullerene
Fullerenes
Indene
isomers
Matching
Materials science
Open circuit voltage
Perovskites
Photovoltaic cells
Silicon
Silicon wafers
Solar cells
wide bandgap
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Summary:Efficient wide‐bandgap (WBG) perovskite solar cells are needed to boost the efficiency of silicon solar cells to beyond Schottky–Queisser limit, but they suffer from a larger open circuit voltage (VOC) deficit than narrower bandgap ones. Here, it is shown that one major limitation of VOC in WBG perovskite solar cells comes from the nonmatched energy levels of charge transport layers. Indene‐C60 bisadduct (ICBA) with higher‐lying lowest‐unoccupied‐molecular‐orbital is needed for WBG perovskite solar cells, while its energy‐disorder needs to be minimized before a larger VOC can be observed. A simple method is applied to reduce the energy disorder by isolating isomer ICBA‐tran3 from the as‐synthesized ICBA‐mixture. WBG perovskite solar cells with ICBA‐tran3 show enhanced VOC by 60 mV, reduced VOC deficit of 0.5 V, and then a record stabilized power conversion efficiency of 18.5%. This work points out the importance of matching the charge transport layers in perovskite solar cells when the perovskites have a different composition and energy levels. One major limitation of open‐circuit voltage (VOC) in wide‐bandgap (WBG) perovskite solar cells comes from the nonmatched charge extraction contact. WBG perovskite solar cells with indene‐C60 bisadduct‐tran3 isomer with higher‐lying lowest‐unoccupied‐molecular‐orbital and reduced energy disorder show enhanced VOC , and then a record stabilized power conversion efficiency of 18.5%.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201700607