An Ultrathin Ferroelectric Perovskite Oxide Layer for High-Performance Hole Transport Material Free Carbon Based Halide Perovskite Solar Cells

Yinglong Yang, Zhenghao Liu, Wai Kit Ng, Lihua Zhang, Hua Zhang, Xiangyue Meng, Yang Bai, Shuang Xiao, Teng Zhang, Chen Hu, Kam Sing Wong, Shihe Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

112 Citations (Scopus)

Abstract

The hole transport material (HTM) free carbon based perovskite solar cells (C-PSCs) are promising for its manufactural simplicity, but they currently suffer from low power conversion efficiencies (PCE) largely because of the voltage loss. Here, a new strategy to increase the PCE by incorporating an ultrathin ferroelectric oxide PbTiO3 layer between the electron transport material and the halide perovskite is reported. The resulting C-PSCs have achieved PCEs up to 16.37%, which is the highest record for HTM-free C-PSCs to date, mainly ascribable to the ferroelectric layer enhanced open circuit voltage. Detail measurements and analysis show an enhanced built-in potential in the C-PSCs as well as suppression of the non-radiative recombination due to the ferroelectric PbTiO3 layer incorporation, accounting for the boosted VOC and photovoltaic performance.

Original languageEnglish
Article number1806506
JournalAdvanced Functional Materials
Volume29
Issue number1
DOIs
Publication statusPublished - 4 Jan 2019
Externally publishedYes

Keywords

  • PbTiO
  • carbon
  • ferroelectricity
  • hole transport material free
  • perovskite solar cells

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Yang, Y., Liu, Z., Ng, W. K., Zhang, L., Zhang, H., Meng, X., Bai, Y., Xiao, S., Zhang, T., Hu, C., Wong, K. S., & Yang, S. (2019). An Ultrathin Ferroelectric Perovskite Oxide Layer for High-Performance Hole Transport Material Free Carbon Based Halide Perovskite Solar Cells. Advanced Functional Materials, 29(1), Article 1806506. https://doi.org/10.1002/adfm.201806506