Amran Al-Ashouri - Boosting Perovskite Tandem Solar Cells with Self-Assembled Monolayers

Описание: Relevant papers:
https://doi.org/10.1039/C9EE02268F
https://doi.org/10.1126/science.abd4016
https://doi.org/10.1016/j.joule.2021....

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Talk by Dr. Amran Al-Ashouri currently a Postdoc at Helmholtz-Zentrum Berlin on November 23rd, 2022
Abstract:
The usage of self-assembled monolayers (SAMs) as hole-selective layers was a key advancement for achieving 29%-efficient monolithic perovskite/silicon and 24%-efficient perovskite/CIGSe tandem solar cells. The SAMs also enabled model systems for a systematic study of charge extraction by transient methods.

This talk covers a short introduction into the development of SAMs for perovskite solar cells (PSCs) and shows which design guidelines could be concluded for a hole-selective interface with minimal non-radiative recombination losses. The SAM model system further allowed an analysis of the influence of hole extraction speed on the fill factor of the PSCs. We found that hole extraction is around 100-times slower than electron extraction in state-of-the-art p-i-n PSCs, which still leaves room for further fill factor gains. Charge extraction and non-radiative recombination was dissected by transient and absolute photoluminescence, and transient surface photovoltage. Finally, an overview of the wide variety of use cases for the SAMs in perovskite solar cells is shown, underlining their versatility, simplicity and robustness.