Enhancing Charge Transport of 2D Perovskite Passivation Agent for Wide-Bandgap Perovskite Solar Cells Beyond 21%

Jiselle Y. Ye, Jinhui Tong, Jun Hu, Chuanxiao Xiao, Haipeng Lu, Sean P. Dunfield, Dong Hoe Kim, Xihan Chen, Bryon W. Larson, Ji Hao, Kang Wang, Qian Zhao, Zheng Chen, Huamin Hu, Wei You, Joseph J. Berry, Fei Zhang, Kai Zhu

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

The replacement of a small amount of organic cations with bulkier organic spacer cations in the perovskite precursor solution to form a 2D perovskite passivation agent (2D-PPA) in 3D perovskite thin films has recently become a promising strategy for developing perovskite solar cells (PSCs) with long-term stability and high efficiency. However, the long, bulky organic cations often form a barrier, hindering charge transport. Herein, for the first time, 2D-PPA engineering based on wide-bandgap (≈1.68 eV) perovskites are reported. Pentafluorophenethylammonium (F5PEA+) is introduced to partially replace phenylethylammonium (PEA+) as the 2D-PPA, forming a strong noncovalent interaction between the two bulky cations. The charge transport across and within the planes of pure 2D perovskites, based on mixed ammoniums, increases by a factor of five and three compared with that of mono-cation 2D perovskites, respectively. The perovskite films based on mixed-ammonium (F5PEA+-PEA+) 2D-PPA exhibit similar surface morphology and crystal structure, but longer carrier lifetime, lower exciton binding energy, less trap density and higher conductivity, in comparison with those using mono-cation (PEA+) 2D-PPA. The performance of PSCs based on mixed-cation 2D-PPA is enhanced from 19.58% to 21.10% along with improved stability, which is the highest performance for reported wide-bandgap PSCs.

Original languageEnglish
Article number2000082
JournalSolar RRL
Volume4
Issue number6
DOIs
Publication statusPublished - 2020 Jun 1
Externally publishedYes

Keywords

  • 2D
  • charge transports
  • passivation agents
  • perovskites
  • solar cells

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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