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Layer-by-Layer-Processed All-Polymer Solar Cells with Enhanced Performance Enabled by Regulating the Microstructure

Yixuan Wu1, Peng Li1, Shiqi Yu1

  • 1School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.

Molecules (Basel, Switzerland)
|June 27, 2024
PubMed
Summary

Layer-by-layer fabrication with additives enhances organic solar cell performance. This method optimizes microstructure, reduces recombination, and achieves a 15.07% power conversion efficiency for all-polymer solar cells.

Keywords:
additiveall-polymer solar cellscharge recombinationlayer-by-layermorphology control

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Layer-by-layer (LBL) fabrication offers precise control over microstructure and component distribution for large-scale organic solar cells (OSCs).
  • All-polymer solar cells (all-PSCs) are promising for flexible and low-cost energy applications.

Purpose of the Study:

  • To investigate the use of LBL fabrication with polymer donors (D18) and acceptors (PYIT-OD) for all-PSCs.
  • To evaluate the impact of additive engineering on the active layer microstructure and photovoltaic performance.

Main Methods:

  • Fabrication of all-PSCs using the layer-by-layer (LBL) method with D18 and PYIT-OD polymers.
  • Morphological studies to analyze the active layer microstructure.
  • Performance characterization of the fabricated solar cells, including power conversion efficiency (PCE).

Main Results:

  • Additive use optimized the active layer microstructure, improving crystallinity and charge transport.
  • An optimized device with 2% CN additive showed reduced bimolecular and trap-assisted recombination.
  • All-PSCs fabricated via LBL achieved a PCE of 15.07%.

Conclusions:

  • Additive engineering combined with LBL fabrication is effective in controlling active layer morphology.
  • This approach significantly enhances the photovoltaic performance of all-polymer solar cells by suppressing charge recombination.