Holistic Energy Landscape Management in 2D/3D Heterojunction via Molecular Engineering for Efficient Perovskite Solar Cells

Ke Ma, Jiaonan Sun, Harindi R. Atapattu, Bryon W. Larson, Hanjun Yang, Dewei Sun, Ke Chen, Kang Wang, Yoonho Lee, Yuanhao Tang, Anika Bhoopalam, Libai Huang, Kenneth R. Graham, Jianguo Mei, Letian Dou

Research output: Contribution to journalArticlepeer-review

14 Scopus Citations

Abstract

Constructing two-dimensional (2D) perovskite atop of 3D with energy landscape management is still a challenge in perovskite photovoltaics. Here, we report a strategy through designing a series of π-conjugated organic cations to construct stable 2D perovskites and to realize delicate energy level tunability at 2D/3D heterojunctions. As a result, the hole transfer energy barriers can be reduced both at heterojunctions and within 2D structures, and the preferable work function shift reduces charge accumulation at interface. Leveraging these insights and also benefitted from the superior interface contact between conjugated cations and poly(triarylamine) (PTAA) hole transporting layer, a solar cell with power conversion efficiency of 24.6% has been achieved, which is the highest among PTAA-based n-i-p devices to the best of our knowledge. The devices exhibit greatly enhanced stability and reproducibility. This approach is generic to several hole transporting materials, offering opportunities to realize high efficiency without using the unstable Spiro-OMeTAD.

Original languageAmerican English
Article numbereadg0032
Number of pages10
JournalScience Advances
Volume9
Issue number23
DOIs
StatePublished - Jun 2023

Bibliographical note

Publisher Copyright:
© 2023 The Authors.

NREL Publication Number

  • NREL/JA-5900-84375

Keywords

  • 2D ligand
  • high PCE
  • perovskite
  • stability
  • surface engineering

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