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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.