Main content area

A Cu₃PS₄ nanoparticle hole selective layer for efficient inverted perovskite solar cells

Yin, Xinxing, McClary, Scott A., Song, Zhaoning, Zhao, Dewei, Graeser, Brian, Wang, Changlei, Shrestha, Niraj, Wang, Xiaoming, Chen, Cong, Li, Chongwen, Subedi, Kamala K., Ellingson, Randy J., Tang, Weihua, Agrawal, Rakesh, Yan, Yanfa
Journal of materials chemistry A 2019 v.7 no.9 pp. 4604-4610
chemistry, energy, hysteresis, nanoparticles, solar cells, solar energy
Cu₃PS₄ nanoparticles are used as a new inorganic hole selective layer (HSL) to fabricate efficient perovskite thin-film solar cells in the inverted device configuration. Compared with other HSL materials used in efficient perovskite solar cells, Cu₃PS₄ has the smallest effective mass for holes. Additionally, Cu₃PS₄ has a valence band energy level of −5.05 eV, which is suitable for effectively extracting holes generated in perovskite absorbers. These reveal intrinsic properties of Cu₃PS₄ that make it an excellent HSL material for perovskite solar cells. We further find that a Cu₃PS₄ nanoparticle HSL promotes grain growth of perovskite thin films, which benefits device performance. Our perovskite solar cells using a Cu₃PS₄ nanoparticle HSL achieve a maximum power conversion efficiency of 18.17% with small hysteresis and a high fill factor of 81.6%, which is significantly better than the performance of the best control device using the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) HSL.