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Understanding the Interfacial Energy Structure and Electron Ex-traction Process in Inverted Organic Solar Cells with Phos-phine-doped Cathode Interlayers
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  • Yi Yang,
  • Jingwen Wang,
  • Xiao Yang,
  • Bowei Xu,
  • Jianhui Hou
Yi Yang
Institute of Chemistry Chinese Academy of Sciences
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Jingwen Wang
Institute of Chemistry
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Xiao Yang
Institute of Chemistry Chinese Academy of Sciences
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Bowei Xu
Beijing University of Chemical Technology

Corresponding Author:[email protected]

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Jianhui Hou
State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
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Abstract

Cathode interlayers (CILs) play an essential role in achieving efficient organic solar cells (OSCs). However, the electronic structure at the electrode/CIL/active layer interfaces and the underlying mechanisms for electron collection remain unclear, which becomes a major obstacle to develop high-performance CILs. Herein, we investigate the relationship of the electron collection abilities of four cross-linked and n-doped CILs (c-NDI:P0, c-NDI:P1, c-NDI:P2, c-NDI:P3) with their electronic structure of space charge region at hetero-junction interface. By accurately calculating the depletion region width according to the barrier height, doping density and permittivi-ty, we put forward that the optimal thickness of CIL should be consistent with the depletion region width to realize the minimum en-ergy loss. As a result, the depletion region width is largely reduced from 13 nm to 0.8 nm at the indium tin oxide (ITO)/c-NDI:P0 in-terface, resulting in a decent PCE of 17.7% for the corresponding inverted OSCs.
25 Oct 2023Submitted to Chinese Journal of Chemistry
26 Oct 2023Assigned to Editor
26 Oct 2023Submission Checks Completed
26 Oct 2023Review(s) Completed, Editorial Evaluation Pending
29 Oct 2023Reviewer(s) Assigned