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Finetuning Hole-Extracting Monolayers for Efficient Organic Solar Cells.

Haijun Bin1, Kunal Datta1, Junke Wang1

  • 1Molecular Materials and Nanosystems & Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven 5600 MB, The Netherlands.

ACS Applied Materials & Interfaces
|March 30, 2022
PubMed
Summary

New carbazole-based monolayers improve organic solar cell efficiency. The 3PACz layer offers higher performance and easier processing than traditional materials, making it ideal for next-generation solar cells.

Keywords:
3PACzhole-transport layermonolayernonfullerene acceptororganic solar cells

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Interface layers are crucial for organic solar cell (OSC) performance.
  • Hole extraction interface engineering remains underexplored.
  • Carbazole-based self-assembled monolayers (SAMs) offer potential for improved OSCs.

Purpose of the Study:

  • To investigate carbazole-based SAMs as hole transport layers (HTLs) in OSCs.
  • To compare the performance of PACz monolayers against PEDOT:PSS.
  • To identify optimal PACz derivatives for enhanced OSC efficiency.

Main Methods:

  • Synthesized carbazole-based SAMs with varying alkane linker lengths (2PACz, 3PACz, 4PACz).
  • Incorporated PACz monolayers as HTLs in OSC devices.
  • Evaluated device performance metrics including power conversion efficiency (PCE), short-circuit current density (Jsc), and fill factor (FF).

Main Results:

  • PACz monolayers demonstrated higher optical transmittance and lower resistance than PEDOT:PSS.
  • OSCs utilizing PACz HTLs achieved higher Jsc and FF.
  • A peak PCE of 17.4% was reached with the 3PACz HTL, surpassing the 16.2% achieved with PEDOT:PSS.
  • 3PACz consistently outperformed 2PACz and 4PACz across various nonfullerene acceptors.

Conclusions:

  • Carbazole-based PACz monolayers are effective HTLs for OSCs.
  • 3PACz shows superior performance, facile synthesis, and convenient processing.
  • 3PACz is a promising candidate for widespread application in organic solar cells.