Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Self-assembled monolayers of para-substituted phenylphosphonic acids were used to modify the surface of nickel oxide layer, which served as the hole-transport layer in the fabrication of inverted perovskite solar cells. The monolayer was installed to modulate the work function of nickel oxide-based on their electron-withdrawing or electron-donating substituent, while the perovskite film morphology and quality were not significantly altered due to the analogous hydrophilic nature of the modified surfaces. The modification impacted the device performance based on the work function modification and the dipole direction of the molecules. The best-performing device was observed with electron-withdrawing cyano-substituted phosphonic acid modification, with a maximum power conversion efficiency of 18.45%.