Suppressed phase segregation for triple-junction perovskite solar cells

by Zaiwei Wang, Lewei Zeng, Tong Zhu, Hao Chen, Bin Chen, Dominik J. Kubicki, Adam Balvanz, Chongwen Li, Aidan Maxwell, Esma Ugur, Roberto dos Reis, Matthew Cheng, Guang Yang, Biwas Subedi, Deying Luo, Juantao Hu, Junke Wang, Sam Teale, Suhas Mahesh, Sasa Wang, Shuangyan HU, Euidae Jung, Mingyang Wei, So Min Park, Luke Grater, Erkan Aydin, Zhaoning Song, Nikolas J. Podraza, Zheng-Hong Lu, Jinsong Huang, Vinayak P. Dravid, Stefaan De Wolf, Yanfa Yan, Michael Grätzel, Mercouri Kanatzidis, Edward Sargent

Article Year: 2023 DOI: https://doi.org/10.1038/s41586-023-06006-7

Bibliography

Wang, Z,. Zeng, L., Zhu, T., Chen, H., Chen, B., J. Kubicki, D., Balvanz, A., Li, C., Maxwell, A., Ugur, E., Dos Reis, R., Cheng, M., Yang, G., Subedi, B., Luo, D., Hu, J., Wang, J., Teale, S., Mahesh, S., Wang, S., Hu, S., Jung, E., Wei, M., Min Park, Luke, G., Aydin, E., Song, Z., J. Podraza, N., Lu, Z., Huang, J., P. Dravid, V., De Wolf, S., Yan, Y., Grätzel, M., Kanatzidis, M., Sargent, E.

Abstract

The tunable band gaps and facile fabrication of perovskites make them attractive for multi-junction photovoltaics1,2. However, light-induced phase segregation limits their efficiency and stability3-5: this occurs in wide band gap (> 1.65 eV) I/Br mixed perovskite absorbers, and becomes even more acute in the top cells of triple-junction solar photovoltaics that requires a fully 2.0 eV band gap absorber2,6. We report herein that lattice distortion in I/Br mixed perovskites is correlated with the suppression of phase segregation, generating an increased ion migration energy barrier arising from the decreased average interatomic distance between A-site cation and iodide. Using a ~2.0 eV Rb/Cs mixed-cation inorganic perovskite with large lattice distortion in the top subcell, we fabricated all-perovskite triple-junction solar cells and achieved an efficiency of 24.3% (23.3% certified quasi-steady-state efficiency) with an open-circuit voltage of 3.21 V. This is, to our knowledge, the first reported certified efficiency for perovskite-based triple-junction solar cells. The triple-junction devices retain 80% of their initial efficiency following 420 hours of operation at the maximum power point.

Keywords

Electronic devices Solar cells