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Toward Efficient Polymer Solar Cells Processed by a Solution-Processed Layer-By-Layer Approach.

Yong Cui1,2, Shaoqing Zhang3, Ningning Liang1,2

  • 1State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

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Summary
This summary is machine-generated.

The layer-by-layer (LBL) method enhances polymer solar cells (PSCs) by controlling donor and acceptor interdiffusion. This technique achieved a 13.0% power conversion efficiency, surpassing conventional methods.

Keywords:
high performancelayer-by-layerpolymer solar cellstunable interdiffusion

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Solution-processed layer-by-layer (LBL) method offers potential for high-performance polymer solar cells (PSCs) by controlling donor and acceptor placement.
  • Current LBL-PSCs exhibit lower power conversion efficiencies (PCEs) compared to conventional one-step-processed PSCs (OS-PSCs).

Purpose of the Study:

  • To address critical issues hindering LBL-PSC performance.
  • To optimize the interdiffusion and phase separation in the active layer of LBL-PSCs.

Main Methods:

  • Utilized a mixed solvent system (o-dichlorobenzene [o-DCB]/tetrahydrofuran) for spin-coating the small-molecule acceptor IT-4F onto a polymer donor (PBDB-TFS1).
  • Controlled interdiffusion between PBDB-TFS1 and IT-4F to achieve ideal phase separation and a large donor/acceptor interface area.

Main Results:

  • The LBL-processed PSCs achieved a PCE of 13.0%.
  • This PCE is higher than the 11.8% achieved by conventional OS solution processing.
  • Demonstrated that controlled interdiffusion is critical for realizing optimal active layer morphology.

Conclusions:

  • The LBL method, with optimized solvent processing, is a promising approach for enhancing PSC performance.
  • This study highlights the potential of LBL processing to significantly improve photovoltaic efficiency in polymer solar cells.