SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 51: Hybrid and Perovskite Photovoltaics III

CPP 51.6: Talk

Thursday, March 30, 2023, 16:30–16:45, GÖR 226

Influence of mesoporous-TiO₂ on mobile ion migration and charge extraction of perovskite solar cells — •Patrick Dörflinger¹, Valentin Schmid¹, Yong Ding², Mohammad Khaja Nazeeruddin², and Vladimir Dyakonov¹ — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL Valais, Sion 1950, Switzerland

Hybrid lead halide perovskite solar cells have reached over 25% power conversion efficiency in the past years but still suffer from poor long term stability. Therefore, increasing attention is given to interfacial engineering. Especially the interplay of the transport layer with the perovskite layer is essential, determining various key properties like the ability of charge extraction or surface recombination. In this study, the potential of different mesoporous TiO₂ electron transport layers (ETL) with focus on the mobile ions is investigated. Therfore, concentration and diffusion of mobile ions, often linked to device degradation, is analyzed by measuring open-circuit voltage decay (OCVD). Furthermore, measuring the photoluminescence quenching efficiencies (PLQE) between open-circuit and short-circuit conditions of complete devices allows to study charge extraction and link the obtained results to device performance. These studies prove the advantage of using a mesoporous-TiO₂ layer made of single-crystalline nanoparticles as an ETL.