Self-Assembled Monolayer Modification of Nickel Oxide Hole-Transport in Perovskite Solar Cells
Neha Singh a b c, Yu-Tai Tao a
a Institute of Chemistry, Academia Sinica, Nankang, Taipei 11529 Taiwan
b Department of physics, National Central University, No. 300, Zhongda Rd, Zhongli, Taiwan, Republic of China
c Molecular Science and Technology, Taiwan International Program, Academia Sinica, Nankang, Taipei, Taiwan, Republic of China
International Conference on Hybrid and Organic Photovoltaics
Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Online, Spain, 2021 May 24th - 28th
Organizers: Marina Freitag, Feng Gao and Sam Stranks
Oral, Neha Singh, presentation 069
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%.

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