Aspartate all-in-one doping strategy enables efficient all-perovskite tandems

Shun Zhou, Shiqiang Fu, Chen Wang, Weiwei Meng, Jin Zhou, Yuanrong Zou, Qingxian Lin, Lishuai Huang, Wenjun Zhang, Guojun Zeng, Dexin Pu, Hongling Guan, Cheng Wang, Kailian Dong, Hongsen Cui, Shuxin Wang, Ti Wang, Guojia Fang () and Weijun Ke ()
Additional contact information
Shun Zhou: Wuhan University
Shiqiang Fu: Wuhan University
Chen Wang: Wuhan University
Weiwei Meng: Wuhan University
Jin Zhou: Wuhan University
Yuanrong Zou: Wuhan University
Qingxian Lin: Wuhan University
Lishuai Huang: Wuhan University
Wenjun Zhang: Wuhan University
Guojun Zeng: Wuhan University
Dexin Pu: Wuhan University
Hongling Guan: Wuhan University
Cheng Wang: Wuhan University
Kailian Dong: Wuhan University
Hongsen Cui: Wuhan University
Shuxin Wang: Wuhan University
Ti Wang: Wuhan University
Guojia Fang: Wuhan University
Weijun Ke: Wuhan University

Nature, 2023, vol. 624, issue 7990, 69-73

Abstract: Abstract All-perovskite tandem solar cells hold great promise in surpassing the Shockley–Queisser limit for single-junction solar cells1–3. However, the practical use of these cells is currently hampered by the subpar performance and stability issues associated with mixed tin–lead (Sn–Pb) narrow-bandgap perovskite subcells in all-perovskite tandems4–7. In this study, we focus on the narrow-bandgap subcells and develop an all-in-one doping strategy for them. We introduce aspartate hydrochloride (AspCl) into both the bottom poly(3,4-ethylene dioxythiophene)–poly(styrene sulfonate) and bulk perovskite layers, followed by another AspCl posttreatment. We show that a single AspCl additive can effectively passivate defects, reduce Sn4+ impurities and shift the Fermi energy level. Additionally, the strong molecular bonding of AspCl–Sn/Pb iodide and AspCl–AspCl can strengthen the structure and thereby improve the stability of Sn–Pb perovskites. Ultimately, the implementation of AspCl doping in Sn–Pb perovskite solar cells yielded power conversion efficiencies of 22.46% for single-junction cells and 27.84% (27.62% stabilized and 27.34% certified) for tandems with 95% retention after being stored in an N2-filled glovebox for 2,000 h. These results suggest that all-in-one AspCl doping is a favourable strategy for enhancing the efficiency and stability of single-junction Sn–Pb perovskite solar cells and their tandems.

Date: 2023
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DOI: 10.1038/s41586-023-06707-z

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