Achieving a high open-circuit voltage in inverted wide-bandgap perovskite solar cells with a graded perovskite homojunction
Abstract
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 (Voc) 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 Voc'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 Voc 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 withoutmore »
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Org.:
- 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
- OSTI Identifier:
- 1512681
- Alternate Identifier(s):
- OSTI ID: 1637196
- Report Number(s):
- NREL/JA-5K00-73656
Journal ID: ISSN 2211-2855
- Grant/Contract Number:
- AC36-08GO28308; FOA-0000990
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Energy
- Additional Journal Information:
- Journal Volume: 61; Journal Issue: C; Journal ID: ISSN 2211-2855
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 14 SOLAR ENERGY; 77 NANOSCIENCE AND NANOTECHNOLOGY; guanidinium bromide; perovskite homojunction; wide-bandgap perovskite solar cells
Citation Formats
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, and Yan, Yanfa. Achieving a high open-circuit voltage in inverted wide-bandgap perovskite solar cells with a graded perovskite homojunction. United States: N. p., 2019.
Web. doi:10.1016/j.nanoen.2019.04.069.
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. Achieving a high open-circuit voltage in inverted wide-bandgap perovskite solar cells with a graded perovskite homojunction. United States. https://doi.org/10.1016/j.nanoen.2019.04.069
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, and Yan, Yanfa. Fri .
"Achieving a high open-circuit voltage in inverted wide-bandgap perovskite solar cells with a graded perovskite homojunction". United States. https://doi.org/10.1016/j.nanoen.2019.04.069. https://www.osti.gov/servlets/purl/1512681.
@article{osti_1512681,
title = {Achieving a high open-circuit voltage in inverted wide-bandgap perovskite solar cells with a graded perovskite homojunction},
author = {Chen, Cong and Song, Zhaoning and Xiao, Chuanxiao and Zhao, Dewei and Shrestha, Niraj and Li, Chongwen and Yang, Guang and Yao, Fang and Zheng, Xiaolu and Ellingson, Randy J. and Jiang, Chun Sheng and Al-Jassim, Mowafak M and Zhu, Kai and Fang, Guojia and Yan, Yanfa},
abstractNote = {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 (Voc) 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 Voc'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 Voc 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.},
doi = {10.1016/j.nanoen.2019.04.069},
journal = {Nano Energy},
number = C,
volume = 61,
place = {United States},
year = {Fri Apr 19 00:00:00 EDT 2019},
month = {Fri Apr 19 00:00:00 EDT 2019}
}
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