Understanding the Photophysical Processes at Interfaces between Perovskites and Hole-Transporting Self-Assembled Monolayers

Abstract
Solar cells formed from metal halide perovskites (MHPs) have reached remarkably high power conversion efficiencies over the past several years, with nearly 26% in single junction devices and over 27% in all-MHP tandem devices. To achieve such high-efficiency tandem devices, stacking of MHPs with different bandgap energies is a necessity. Bandgap engineering in MHPs can be achieved by varying the stoichiometry of the components; for example, changing the halide ratio in CsFAPb(BrxI1-x)3 can continuously tune the bandgap across a wide range, from 1.6-2.2 eV. While this halide mixing is critical towards developing tandem devices, there is also a drawback: photo-induced phase segregation occurs within these materials, in which different halides separate into iodide-rich and bromide-rich perovskite phases, embedded within the remaining well-mixed phase.

Acknowledgements
This abstract is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: ORA-CRG2021-4681. C. E. P. acknowledges support by the KAUST Global Fellowship Program, under the auspice of the Vice President for Research.

Publisher
FUNDACIO DE LA COMUNITAT VALENCIANA SCITO

Conference/Event Name
International Conference on Hybrid and Organic Photovoltaics Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)

DOI
10.29363/nanoge.hopv.2023.159