Low-Temperature-Deposited TiO2 Nanopillars for Efficient and Flexible Perovskite Solar Cells

Zhongwei Wu, Peng Li, Jie Zhao, Ting Xiao, Hong Hu, Peng Sun, Zehan Wu, Jianhua Hao, Chunlin Sun, Haoli Zhang, Zhifeng Huang*, Zijian Zheng*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

16 Citations (Scopus)


Organometal halide perovskite solar cells (PSCs) are promisingly applied to flexible solar cells because of the high power conversion efficiency (PCE) and intrinsic softness of perovskite materials. In the most efficient PSCs, mesoporous TiO2 generally functions as the electron transporting layer. However, the mesoporous TiO2 is typically generated through high-temperature thermal annealing that is not suitable for producing flexible PSCs. In this work, TiO2 nanopillar arrays are directly deposited on flexible substrates using glancing angle deposition at low substrate temperature. The TiO2 nanopillars strongly adhere to the flexible substrates, improving light harvesting in the perovskite layers, facilitating electron extraction and transportation, and enhancing the mechanical flexibility of the PSCs. The flexible PSCs hybridized with the TiO2 nanopillars show a PCE as high as 13.3% and excellent photovoltaic stability after 500 cycles of bending at a small radius of curvature.

Original languageEnglish
Article number2001512
JournalAdvanced Materials Interfaces
Issue number3
Early online date30 Nov 2020
Publication statusPublished - 5 Feb 2021

Scopus Subject Areas

  • Mechanics of Materials
  • Mechanical Engineering

User-Defined Keywords

  • flexible solar cells
  • glancing angle deposition
  • low temperature
  • perovskite
  • TiO nanopillars


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