Dresden 2020 – wissenschaftliches Programm

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AKjDPG: Arbeitskreis junge DPG

AKjDPG 7: PhD Focus Session: In-situ probes toward better understanding of hybrid halide perovskites II (joint session CPP/AKjDPG)

AKjDPG 7.3: Vortrag

Freitag, 20. März 2020, 10:15–10:30, ZEU 222

The zero step for degrading perovskite solar cells: what atmosphere should we choose? — •Renjun Guo¹, Wei Chen¹, Lennart K. Reb¹, Manuel A. Scheel¹, Stephan Roth², and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany — ²Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany

The power conversion efficiency (PCE) of perovskite solar cells (PSCs) reached the champion value of 25.2 percent, making this technique competitive with commercial silicon solar cells. Despite such advantages, the application of PSCs is currently limited by combining high performance and operational stability because PCE of PSCs can degrade due to the presence of temperature, light, humidity, and oxygen. Besides, current degradation research on PSCs is carried out without standard protocol. Therefore, it is necessary to make the standard protocol for the long term degradation of PSCs. We investigated degradation processes of PSCs under both AM 1.5G and different atmosphere conditions with in-situ grazing incidence wide-angle X-ray scattering (GIWAXS) and grazing incidence small-angle X-ray scattering (GISAXS). With these approaches, we can follow the evolution of characteristic structures and of the inner morphology under the operational condition. After understanding the degradation mechanisms upon different atmosphere (nitrogen and vacuum), we can choose a reasonable atmosphere which allows for the standard aging routine to guide industrial development.