Affiliation:
1. Institute for Materials Discovery University College London Malet Place London WC1E 7JE UK
2. Nanoelectronics and Device Physics Lab School of Physical Sciences National Institute of Science Education and Research OCC of HBNI Jatni 752050 India
3. School of Aerospace Engineering University of Rome Sapienza 00138 Rome Italy
4. Department of Applied Physics and Astronomy University of Sharjah P. O. Box 27272 Sharjah United Arab Emirates
5. Bullaki Ltd. Covent Garden London WC2H 9JQ UK
Abstract
Perovskite solar cells (PSCs) have reached a formidable power conversion efficiency of 25.7% over the years of development. One of the strategies that has been responsible for the development of stable and highly efficient PSCs is modifications of the monovalent A‐site cations (methylammonium, MA; formamidinium, FA; cesium, Cs, etc.) in lead halide perovskites. Herein, the impact of modifying the monovalent cation (MA, FAMA, CsFAMA, potassium‐passivated CsFAMA, rubidium‐passivated CsFAMA) in lead halide perovskite on their optoelectronic, charge transport, and photovoltaic behavior is systematically studied. Reduced trap density and improved charge carrier mobility after introduction of FA and Cs in the MAPb(I0.85Br0.15)3 system are confirmed. Further passivation of the triple‐cation perovskite with K and Rb enhances the optoelectronic characteristics, charge transport, and charge extraction efficiency in halide perovskite solar cells.
Funder
Horizon 2020 Framework Programme
Royal Society