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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Poster III

CPP 28.39: Poster

Wednesday, March 20, 2024, 11:30–13:30, Poster C

Charge transfer and recombination in hole transport/perovskite bilayers probed by photoluminescence — •Lukas Schäfer, Patrick Dörflinger, Olga Trukhina, and Vladimir Dyakonov — Experimental Physics 6, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany

Hole transport materials (HTMs) play a crucial role in enhancing the performance of perovskite solar cells by selectively extracting holes from the active layer. While their charge extraction capabilities positively impact solar cell efficiency, surface recombination at the perovskite interface can hinder overall performance. In this study, we employ steady-state PL (SSPL) as well as time-resolved PL (TRPL) experiments on HTM/perovskite bilayers to assess the charge extraction capability and the surface recombination. We demonstrate the quenching of the photoluminescence quantum yield of these bilayers which is characteristic for the extraction of charges and their non-radiative recombination at the HTM/perovskite interface. Furthermore, the bilayers exhibit a faster decay in TRPL transients compared to pristine perovskite. This can be indicative for charge extraction and surface recombination. SSPL and TRPL have proven to be useful tools to characterize novel HTMs for perovskite solar cell applications and to gain insights into the processes at the interface between the perovskite and the HTMs.

Keywords: Perovskite; Photoluminescence; Charge carrier recombination; TRPL; HTM