Regensburg 2025 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Poster Session II

CPP 32.43: Poster

Thursday, March 20, 2025, 09:30–12:00, P3

In-situ Monitoring for Optimizing Perovskite Solar Cell Fabrication: Correlating Process Parameters with Power Conversion Efficiency — •Yuxin Liu, Alexander Tarasov, Maxim Simmonds, and Eva Unger — Department Solution Processing of Hybrid Materials and Devices, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany

Halide perovskite solar cells need dependable, reproducible production to reach commercialization. For stable perovskite photovoltaic manufacture and research, deposition processes must be monitored. In-situ photoluminescence (PL) monitoring compares the PL during spin-coating and annealing with absolute PL measurements obtained after annealing of the sample. Examples demonstrating how process conditions and variables like anti-solvent type and drip timing significantly influence PL signatures. We demonstrate that insight during processing can serve as feedback to stabilize the perovskite solar cell fabrication. In-situ PL monitoring shows two distinct peaks within one second of anti-solvent treatment, revealing perovskite nucleation and growth mechanism. All Helmholtz association perovskite PV research uses a standard operating procedure (SOP) for solar cell samples. Absolute PL measurements for thin-film samples quantify Quasi-Fermi Level Splitting, reflecting the opto-electronic quality of the absorber and losses at selective contacts. The absolute PL is correlated to the in-situ PL to establish how far in-situ PL during processing can predict solar cell performance. This study highlights the potential of optical process monitoring to enhance material and interface quality.

Keywords: In-situ Photoluminescence; Spin-coating; Perovskite; Absolute Photoluminescence; standard operating procedure (SOP)