Achieving a high open-circuit voltage in inverted wide-bandgap perovskite solar cells with a graded perovskite homojunction

Chen, Cong; Song, Zhaoning; Xiao, Chuanxiao; Zhao, Dewei; Shrestha, Niraj; Li, Chongwen; Yang, Guang; Yao, Fang; Zheng, Xiaolu; Ellingson, Randy J.; Jiang, Chun Sheng; Al-Jassim, Mowafak M; Zhu, Kai; Fang, Guojia; Yan, Yanfa

doi:10.1016/j.nanoen.2019.04.069

Title: Achieving a high open-circuit voltage in inverted wide-bandgap perovskite solar cells with a graded perovskite homojunction

Journal Article · Fri Apr 19 00:00:00 EDT 2019 · Nano Energy

DOI:https://doi.org/10.1016/j.nanoen.2019.04.069· OSTI ID:1512681

Chen, Cong ^[1]; Song, Zhaoning ^[2]; Xiao, Chuanxiao ^[3]; Zhao, Dewei ^[4]; Shrestha, Niraj ^[2]; Li, Chongwen ^[2]; Yang, Guang ^[5]; Yao, Fang ^[5]; Zheng, Xiaolu ^[1]; Ellingson, Randy J. ^[2]; Jiang, Chun Sheng ^[3]; Al-Jassim, Mowafak M ^[3]; Zhu, Kai ^[3]; Fang, Guojia ^[5]; Yan, Yanfa ^[2]

Univ. of Toledo, OH (United States); Wuhan Univ. (China)
Univ. of Toledo, OH (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Univ. of Toledo, OH (United States); Nanchang Univ. (China)
Wuhan Univ. (China)

Wide-bandgap (~1.7-1.8 eV) perovskite solar cells have attracted substantial research interest in recent years due to their great potential to fabricate efficient tandem solar cells via combining with a lower bandgap (1.1-1.3 eV) absorber (e.g., Si, copper indium gallium diselenide, or low-bandgap perovskite). However, wide-bandgap perovskite solar cells usually suffer from large open circuit voltage (V_oc) deficits caused by small grain sizes and photoinduced phase segregation. Here, we demonstrate that in addition to large grain sizes and passivated grain boundaries, controlling interface properties is critical for achieving high V_oc's in the inverted wide-bandgap perovskite solar cells. We adopt guanidinium bromide solution to tune the effective doping and electronic properties of the surface layer of perovskite thin films, leading to the formation of a graded perovskite homojunction. The enhanced electric field at the perovskite homojunction is revealed by Kelvin probe force microscopy measurements. This advance enables an increase in the V_oc of the inverted perovskite solar cells from an initial 1.12 V to 1.24 V. With the optimization of the device fabrication process, the champion inverted wide-bandgap cell delivers a power conversion efficiency of 18.19% and sustains more than 72% of its initial efficiency after continuous illumination for 70 h without encapsulation. Additionally, a semitransparent device with an indium tin oxide back contact retains more than 88% of its initial efficiency after 100 h maximum power point tracking.

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Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S), SunShot Initiative; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: AC36-08GO28308; FOA-0000990

OSTI ID:: 1512681

Alternate ID(s):: OSTI ID: 1637196

Report Number(s):: NREL/JA-5K00-73656

Journal Information:: Nano Energy, Vol. 61, Issue C; ISSN 2211-2855

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 110 works

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guanidinium bromide
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Title: Achieving a high open-circuit voltage in inverted wide-bandgap perovskite solar cells with a graded perovskite homojunction

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