期刊
NANO ENERGY
卷 90, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106608
关键词
Wide-bandgap perovskite solar cells; 2-thiopheneethylammonium chloride; Open-circuit voltage deficits; Stability; Perovskite; CIGS tandem solar cells
类别
资金
- National Natural Science Foundation of China [62074117, 61904126]
- Natural Science Foundation of Hubei Province, China [2019AAA020, 2019CFB122]
- Zhejiang Provincial Natural Science Foundation of China [LQ21B020009]
- Jiaxing Public Welfare Research Program [2020AY10011]
The device treated with TEACl achieves the highest power conversion efficiency and better stability, forming a thiophene-based 2D/3D perovskite heterojunction. This strategy improves the activation energy of ion movement and reduces the dark saturation current density of the device.
Fabricating highly efficient and stable inverted wide-bandgap (WBG) perovskite solar cells (PSCs) is the key factor for developing high-efficiency and stabilized tandem solar cells. Herein, we propose an interfacial engineering strategy to form a 2D/3D perovskite heterojunction using 2-thiopheneethylammonium chloride (TEACl). The thiophene-based 2D/3D perovskite heterojunction improves the optoelectronic properties of the perovskite absorber, passivates the electron and hole traps, increases the activation energy of the ion movement, and lowers the dark saturation current density of the device. As a result, the device with TEACl treatment delivers a champion power conversion efficiency of 20.31% with a 1.68-eV bandgap. In addition, the devices with TEACl treatment exhibit superior stability than the control devices under various testing conditions. Finally, an efficiency of 24.0% is achieved for a 4-terminal perovskite/CIGS tandem solar cell. Our results demonstrate that the thiophene-based 2D/3D perovskite heterojunction is a promising approach for achieving efficient and stable WBG PSCs.
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