Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO22)
DOI: https://doi.org/10.29363/nanoge.nipho.2022.002
Publication date: 11th November 2021
The perovskite solar cells have been extensively developed since 2009 but still the ultrafast processes occurring at the interfaces in that system are not fully understood. The main tool providing wide view of a charge transport behavior is transient absorption spectroscopy. We focused on the investigation of electron transport paths: after light absorption, an electron is promoted from the valence to the conduction band, and then several processes can occur. First few hundreds of femtosecond after light absorption are governed by cooling of the hot carriers. When the process is finished, sharp bleach due to the band filling phenomena occurs at absorption edge in the transient absorption measurements. Its decay correlates with photoluminescence kinetics and represents the excited carrier lifetime. That decay proceeds by several paths such as the recombination (first-, second- and third-order) and the charge injection to an electron transporting material (ETM) or a hole transporting material (HTM).
Despite the fact that scientific world has been better understanding processes within perovskite material, we are still quite far from description of a full cell (with gold electrodes) behavior at working conditions i.e. with applied voltage and under light illumination. Therefore, I will present our recent spectroscopic findings, mainly, the femtosecond transient absorption measured through different thickness gold electrodes in full PSC. The measurements were taken with only femtosecond laser illumination as well as with applied additional potential and with 1Sun illumination during experiments. I will also describe differences in carrier transport behavior between perovskite/ETM and perovskite/HTM interfaces.
The study was supported by Polish Ministry of Science and Higher Education (Ministerstwo Nauki i Szkolnictwa Wyższego) under project “Diamentowy Grant” 0019/DIA/2017/46.
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