TY - JOUR
T1 - How Humidity and Light Exposure Change the Photophysics of Metal Halide Perovskite Solar Cells
AU - Ugur, Esma
AU - Alarousu, Erkki
AU - Khan, Jafar I.
AU - Vlk, Aleš
AU - Aydin, Erkan
AU - De Bastiani, Michele
AU - Balawi, Ahmed H.
AU - Gonzalez Lopez, Sandra P.
AU - Ledinský, Martin
AU - De Wolf, Stefaan
AU - Laquai, Frédéric
N1 - Funding Information:
This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No.: OSR‐2018‐CARF/CCF‐3079. E.U. and F.L. thank K. Vandewal and M. Baier for contributing to the setup for photothermal deflection spectroscopy (PDS). M.L. and A.V. acknowledge the support of Czech Science Foundation Project No. 17‐26041Y, Operational Programme Research, Development, and Education financed by the European Structural and Investment Funds and the Czech Ministry of Education, Youth and Sports (Project No. CZ.02.1.01/0.0/0.0/16_019/0000760 – SOLID21) and CzechNanoLab Research Infrastructure supported by MEYS CR (LM2018110).
Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2020
Y1 - 2020
N2 - 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, in this context, the impact of excess lead iodide (PbI2) is revealed. For exposed samples, the formation of subbandgap states and increased trap-assisted recombination is observed, using highly sensitive absorption and time-resolved photoluminescence (TRPL) 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.
AB - 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, in this context, the impact of excess lead iodide (PbI2) is revealed. For exposed samples, the formation of subbandgap states and increased trap-assisted recombination is observed, using highly sensitive absorption and time-resolved photoluminescence (TRPL) 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.
KW - metal halide perovskites
KW - perovskite photophysics
KW - perovskite solar cells
KW - photodegradation
UR - http://www.scopus.com/inward/record.url?scp=85091381917&partnerID=8YFLogxK
U2 - 10.1002/solr.202000382
DO - 10.1002/solr.202000382
M3 - Article
AN - SCOPUS:85091381917
SN - 2367-198X
VL - 4
JO - Solar RRL
JF - Solar RRL
IS - 11
M1 - 2000382
ER -