Matching Charge Extraction Contact for Wide-Bandgap Perovskite Solar Cells

Lin, Yuze; Chen, Bo; Zhao, Fuwen; Zheng, Xiaopeng; Deng, Yehao; Shao, Yuchuan; Fang, Yanjun; Bai, Yang; Wang, Chunru; Huang, Jinsong

doi:10.1002/adma.201700607

Matching Charge Extraction Contact for Wide-Bandgap Perovskite Solar Cells

Journal Article · Wed May 03 00:00:00 EDT 2017 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201700607· OSTI ID:1533040

Lin, Yuze ^[1]; Chen, Bo ^[2]; Zhao, Fuwen ^[3]; Zheng, Xiaopeng ^[2]; Deng, Yehao ^[2]; Shao, Yuchuan ^[2]; Fang, Yanjun ^[2]; Bai, Yang ^[2]; Wang, Chunru ^[3]; Huang, Jinsong ^[4]

Univ. of Nebraska, Lincoln, NE (United States). Dept. of Mechanical and Materials Engineering. Nebraska Center for Materials and Nanoscience; DOE/OSTI
Univ. of Nebraska, Lincoln, NE (United States). Dept. of Mechanical and Materials Engineering. Nebraska Center for Materials and Nanoscience
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Chemistry
Univ. of Nebraska, Lincoln, NE (United States). Dept. of Mechanical and Materials Engineering. Nebraska Center for Materials and Nanoscience; Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Applied Physical Sciences

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 (V_OC) deficit than narrower bandgap ones. Here, it is shown that one major limitation of V_OC 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 V_OC 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 V_OC by 60 mV, reduced V_OC 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of North Carolina, Chapel Hill, NC (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0006709

OSTI ID:: 1533040

Alternate ID(s):: OSTI ID: 1401789

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 26 Vol. 29; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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