A Review of Inorganic Hole Transport Materials for Perovskite Solar Cells

Po Kai Kung, Ming Hsien Li, Pei Ying Lin, Yu Hsien Chiang, Chia Ru Chan, Tzung Fang Guo, Peter Chen

Research output: Contribution to journalReview articlepeer-review

121 Citations (Scopus)


This review presents various hole transport layers (HTLs) employed in perovskite solar cells (PSCs) in pursuing high power conversion efficiency (PCE) and functional stability. The PSCs have achieved high PCE (over 23%, certified by NREL) and more efforts have been devoted into research for stability enhancement. Inorganic HTLs become a popular choice as selective contact materials because of their intrinsic chemical stability and low cost. HTLs and electron transport layers (ETLs) are critical components of PSCs due to the requirement to create charge collection selectivity. Herein the authors provide an overview on inorganic HTLs synthesis, properties, and their application in various PSCs for both mesoporous and planar architectures. Inorganic HTLs with appropriate properties, such as proper energy level and high carrier mobility, can not only assist with charge transport, but also improve the stability of PSCs under ambient conditions. The importance of interfacial chemistry and interfacial charge transport is further addressed to understand the underlying mechanism of related degradation and carrier dynamic. It is expected that the success of the inorganic HTL in PSCs can stimulate further research and bring real impact for future photovoltaic technologies.

Original languageEnglish
Article number1800882
JournalAdvanced Materials Interfaces
Issue number22
Publication statusPublished - 2018 Nov 23

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering


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