In Situ Back-Contact Passivation Improves Photovoltage and Fill Factor in Perovskite Solar Cells

Furui Tan, Hairen Tan*, Makhsud I. Saidaminov, Mingyang Wei, Mengxia Liu, Anyi Mei, Peicheng Li, Bowen Zhang, Chih Shan Tan, Xiwen Gong, Yongbiao Zhao, Ahmad R. Kirmani, Ziru Huang, James Z. Fan, Rafael Quintero-Bermudez, Junghwan Kim, Yicheng Zhao, Oleksandr Voznyy, Yueyue Gao, Feng ZhangLee J. Richter, Zheng Hong Lu, Weifeng Zhang, Edward H. Sargent

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

139 Scopus citations


Organic–inorganic hybrid perovskite solar cells (PSCs) have seen a rapid rise in power conversion efficiencies in recent years; however, they still suffer from interfacial recombination and charge extraction losses at interfaces between the perovskite absorber and the charge–transport layers. Here, in situ back-contact passivation (BCP) that reduces interfacial and extraction losses between the perovskite absorber and the hole transport layer (HTL) is reported. A thin layer of nondoped semiconducting polymer at the perovskite/HTL interface is introduced and it is shown that the use of the semiconductor polymer permits—in contrast with previously studied insulator-based passivants—the use of a relatively thick passivating layer. It is shown that a flat-band alignment between the perovskite and polymer passivation layers achieves a high photovoltage and fill factor: the resultant BCP enables a photovoltage of 1.15 V and a fill factor of 83% in 1.53 eV bandgap PSCs, leading to an efficiency of 21.6% in planar solar cells.

Original languageEnglish
Article number1807435
JournalAdvanced Materials
Issue number14
StatePublished - 5 Apr 2019


  • band alignment
  • passivation
  • perovskite solar cells
  • semiconducting polymers


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