All-perovskite tandem solar cells with 24.2% certified efficiency and area over 1 cm2 using surface-anchoring zwitterionic antioxidant

Ke Xiao, Renxing Lin, Qiaolei Han, Yi Hou, Zhenyuan Qin, Hieu T. Nguyen, Jin Wen, Mingyang Wei, Vishal Yeddu, Makhsud I. Saidaminov, Yuan Gao, Xin Luo, Yurui Wang, Han Gao, Chunfeng Zhang, Jun Xu, Jia Zhu, Edward H. Sargent and Hairen Tan ()
Additional contact information
Ke Xiao: Nanjing University
Renxing Lin: Nanjing University
Qiaolei Han: Nanjing University
Yi Hou: University of Toronto
Zhenyuan Qin: Nanjing University
Hieu T. Nguyen: The Australian National University
Jin Wen: Nanjing University
Mingyang Wei: University of Toronto
Vishal Yeddu: University of Victoria
Makhsud I. Saidaminov: University of Victoria
Yuan Gao: Nanjing University
Xin Luo: Nanjing University
Yurui Wang: Nanjing University
Han Gao: Nanjing University
Chunfeng Zhang: Nanjing University
Jun Xu: Nanjing University
Jia Zhu: Nanjing University
Edward H. Sargent: University of Toronto
Hairen Tan: Nanjing University

Nature Energy, 2020, vol. 5, issue 11, 870-880

Abstract: Abstract Monolithic all-perovskite tandem solar cells offer an avenue to increase power conversion efficiency beyond the limits of single-junction cells. It is an important priority to unite efficiency, uniformity and stability, yet this has proven challenging because of high trap density and ready oxidation in narrow-bandgap mixed lead–tin perovskite subcells. Here we report simultaneous enhancements in the efficiency, uniformity and stability of narrow-bandgap subcells using strongly reductive surface-anchoring zwitterionic molecules. The zwitterionic antioxidant inhibits Sn2+ oxidation and passivates defects at the grain surfaces in mixed lead–tin perovskite films, enabling an efficiency of 21.7% (certified 20.7%) for single-junction solar cells. We further obtain a certified efficiency of 24.2% in 1-cm2-area all-perovskite tandem cells and in-lab power conversion efficiencies of 25.6% and 21.4% for 0.049 cm2 and 12 cm2 devices, respectively. The encapsulated tandem devices retain 88% of their initial performance following 500 hours of operation at a device temperature of 54–60 °C under one-sun illumination in ambient conditions.

Date: 2020
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DOI: 10.1038/s41560-020-00705-5

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