Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.041
Publication date: 7th February 2022
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), shows their application in perovskite tandem solar cells and shows which design guidelines could be concluded for a high-performance hole-selective interface. A combination of time-resolved and absolute photoluminescence spectroscopy, together with solar cell characterization identified how non-radiative recombination losses were minimized at the hole-selective interface, leading to high open-circuit voltages. 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 p-i-n PSCs, which still leaves room for further fill factor gains. The dissection of charge extraction and non-radiative recombination in a perovskite absorber deposited on hole-selective layers was further detailed by a transient surface photovoltage study, confirming and completing the photoluminescence and solar cell analysis.
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.
Supported by Federal Ministry for Education and Research (BMBF) grant 03SF0540 within the project “Materialforschung für die Energiewende”; the Federal Ministry for Economic Affairs and Energy (BMWi)–funded project ProTandem (0324288C); the HyPerCells graduate school; the Helmholtz Association within the HySPRINT Innovation lab project and TAPAS project; the Helmholtz Association via HI-SCORE (Helmholtz International Research School); the European Union’s Horizon 2020 research and innovation program under grant agreement 763977 of the PerTPV project; the Research Council of Lithuania under grant agreement S‐MIP‐19‐5/SV3‐1079 of the SAM project; the PEROSEED project and the AiF project (ZIM-KK5085302DF0).
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