How humidity and light exposure change the photophysics of metal halide perovskite solar cells

0537871 - FZÚ 2021 RIV DE eng J - Journal Article
Ugur, E. - Alarousu, E. - Khan, J.I. - Vlk, Aleš - Aydin, E. - De Bastiani, M. - Balawi, A.H. - Gonzalez Lopez, S.P. - Ledinský, Martin - De Wolf, S. - Laquai, F.
How humidity and light exposure change the photophysics of metal halide perovskite solar cells.
Solar RRL. Roč. 4, č. 11 (2020), s. 1-10, č. článku 2000382. ISSN 2367-198X. E-ISSN 2367-198X
R&D Projects: GA MŠMT LM2018110; GA MŠMT(CZ) EF16_019/0000760; GA ČR GJ17-26041Y
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : cells photodegradation * metal halide perovskites * perovskite photophysics
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 8.582, year: 2020
Method of publishing: Limited access
https://doi.org/10.1002/solr.202000382

Metal halide perovskites exhibit outstanding optical and electronic properties but are very sensitive to humidity and light-soaking. In this work, the photophysics of perovskites that have been exposed to such conditions are studied and the impact of excess lead iodide is revealed. For exposed samples, the formation of sub-bandgap states and increased trap assisted recombination is observed, using highly sensitive absorption and time-resolved photoluminescence measurements, respectively. It appears that such exposure primarily affects the perovskite surface. Consequently, on n–i–p device level, the spiro-OMeTAD/perovskite interface is more rapidly affected than its buried electron-collecting interface. Moreover, both stoichiometric and nonstoichiometric MAPbI3-based solar cells show reduced device performance mainly due to voltage losses. Overall, this study brings forward key points to consider in engineering perovskite solar cells with improved performance and material stability.

Permanent Link: http://hdl.handle.net/11104/0315701