Impact of Cation Multiplicity on Halide Perovskite Defect Densities and Solar Cell Voltages
Dang, Hoang X.
De Wolf, Stefaan
KAUST DepartmentPhysical Science and Engineering (PSE) Division
KAUST 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 NumberOSR-CARF URF/1/3079-33-01
Embargo End Date2021-12-08
Permanent link to this recordhttp://hdl.handle.net/10754/666398
MetadataShow full item record
AbstractMetal-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.
CitationLedinský, 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.0c08193
SponsorsThe 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).
PublisherAmerican Chemical Society (ACS)