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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Poster III
CPP 28.36: Poster
Mittwoch, 20. März 2024, 11:30–13:30, Poster C
Tuning band gap of double perovskite by anion exchange — •Zhaonan Jin1 and Peter Müller-Buschbaum1,2 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2TUM, MLZ, 85748 Garching, Germany
Double perovskite is a relatively new kind of lead-free perovskite that possesses low toxicity, long charge carrier lifetime and small effective charge carrier mass. It is considered as a promising photovoltaic material. Bismuth-based double perovskites have received considerable attention in recent years, and among them, Cs2AgBiX6 (X =Cl, Br, I) has displayed the most promising potential for photovoltaic applications due to the suitable band gap. Some researchers studied thermoelectric properties of double halide perovskite Cs2AgBiI6 and proved that it is an excellent candidate for thermoelectric applications. Increasing the content of iodide ions in Cs2AgBiX6 can effectively narrow the band gap. In this work, the iodide ions will be introduced to Cs2AgBiBr6 by adding TMSI when spin-coating. It is reported that no more anion exchange happened with more TMSI. Therefore, Cs2AgBi(BrxI1-x)6 perovskite solar cells will be fabricated by solution method. The anion exchange process is studied in this work. Morphology, device characterizations techniques like XRD, SEM, J-V curves, EQE spectra etc. are taken to help optimize the morphology of thin films and PCE of solar cells. In-operando studies are taken to identify morphology changes during device operation.
Keywords: Double perovskite; PSCs; Photovoltaics