Impact of Cation Multiplicity on Halide Perovskite Defect Densities and Solar Cell Voltages
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ArticleAuthors
Ledinský, Martin
Vlk, Aleš
Schönfeldová, Tereza
Holovský, Jakub
Aydin, Erkan

Dang, Hoang X.
Hájková, Zdeňka
Landová, Lucie
Valenta, Jan
Fejfar, Antonín
De Wolf, Stefaan

KAUST Department
Physical Science and Engineering (PSE) DivisionKAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
Material Science and Engineering Program
KAUST Solar Center (KSC)
KAUST Grant Number
OSR-CARF URF/1/3079-33-01Date
2020-12-08Embargo End Date
2021-12-08Submitted Date
2020-09-08Permanent link to this record
http://hdl.handle.net/10754/666398
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Show full item recordAbstract
Metal-halide perovskites feature very low deep-defect densities, thereby enabling high operating voltages at the solar cell level. Here, by precise extraction of their absorption spectra, we find that the low deep-defect density is unaffected when cations such as Cs+ and Rb+ are added during the perovskite synthesis. By comparing single crystals and polycrystalline thin films of methylammonium lead iodide/bromide, we find these defects to be predominantly localized at surfaces and grain boundaries. Furthermore, generally, for the most important photovoltaic materials, we demonstrate a strong correlation between their Urbach energy and open-circuit voltage deficiency at the solar cell level. Through external quantum yield photoluminescence efficiency measurements, we explain these results as a consequence of nonradiative open-circuit voltage losses in the solar cell. Finally, we define practical power conversion efficiency limits of solar cells by taking into account the Urbach energy.Citation
Ledinský, M., Vlk, A., Schönfeldová, T., Holovský, J., Aydin, E., Dang, H. X., … De Wolf, S. (2020). Impact of Cation Multiplicity on Halide Perovskite Defect Densities and Solar Cell Voltages. The Journal of Physical Chemistry C. doi:10.1021/acs.jpcc.0c08193Sponsors
The authors acknowledge the support of the 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_019/0000760SOLID21 and CzechNanoLab Research Infrastructure LM2018110). E.A., H.X.D., and S.D.W. acknowledge financial support under Award No. OSR-CARF URF/1/3079-33-01 by King Abdullah University of Science and Technology (KAUST). J.V. acknowledges support from the Charles University Research Centre (UNCE/SCI/010).Publisher
American Chemical Society (ACS)Additional Links
https://pubs.acs.org/doi/10.1021/acs.jpcc.0c08193ae974a485f413a2113503eed53cd6c53
10.1021/acs.jpcc.0c08193