Efficient and stable perovskite-silicon tandem solar cells through contact displacement by MgFx

by Jiang Liu, Michele De Bastiani, Erkan Aydin, George T. Harrison, Yajun Gao, Rakesh R. Pradhan, Mathan K. Eswaran, Mukunda Mandal, wenbo Yan, Akmaral Seitkhan, Maxime Babics, Anand S. Subbiah, Esma Ugur, Fuzong Xu, Lujia Xu, Mingcong Wang, Atteq ur Rehman, Arsalan Razzaq, Jingxuan Kang, Randi Azmi, Ahmed Ali Said, Furkan H. Isikgor, Thomas G. Allen, Denis Andrienko, Udo Schwingenschlögl, Frédéric Laquai, Stefaan De Wolf

Report Year: 2022 DOI: https://doi.org/10.1126/science.abn8910

Bibliography

Liu, J., De Bastiani, M., Aydin, E., T. Harrison, G., Gao, Y., R. Pradhan, R., K. Eswaran, M., Mandal, M., Yan W., Seitkhan, A., Babics, M., S. Subbiah, A., Ugur, E., Xu, F., Xu, L., Wang, M., Ur Rehman, A., Razzaq, A., Kang, J., Azmi, R., Ali Said, H., H. Isikgor, F., G. Allen, T., Andrienko, D., Schwingenschlögl, U., Laquai, F., De Wolf, S.

Extra Information

Abstract

The performance of perovskite solar cells with inverted polarity (p-i-n) is still limited by recombination at their electron extraction interface, which also lowers the power conversion efficiency (PCE) of p-i-n perovskite-silicon tandem solar cells. A ~1 nm thick MgFx interlayer at the perovskite/C60 interface through thermal evaporation favorably adjusts the surface energy of the perovskite layer, facilitating efficient electron extraction, and displaces C60 from the perovskite surface to mitigate nonradiative recombination. These effects enable a champion Voc of 1.92 volts, an improved fill factor of 80.7%, and an independently certified stabilized PCE of 29.3% for a ~1 cm2 monolithic perovskite-silicon tandem solar cell. The tandem retained ~95% of its initial performance following damp-heat testing (85 Celsius at 85% relative humidity) for > 1000 hours.