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Solid Additive-Assisted Layer-by-Layer Processing for 19% Efficiency Binary Organic Solar Cells.

Guanyu Ding1, Tianyi Chen1, Mengting Wang1

  • 1State Key Laboratory of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.

Nano-Micro Letters
|April 10, 2023
PubMed
Summary
This summary is machine-generated.

A novel solid additive-assisted layer-by-layer (SAA-LBL) processing method enhances organic solar cell (OSC) performance by controlling morphology. This technique improves exciton dissociation and charge transport, leading to higher power conversion efficiencies (PCEs).

Keywords:
Fatty acidLayer-by-layerOrganic solar cellsSolid additiveVertical phase separation

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Morphology is critical for organic solar cell (OSC) performance, influencing exciton dissociation and charge recombination.
  • Effective control over active layer morphology is essential for achieving high power conversion efficiencies (PCEs).

Purpose of the Study:

  • To develop a novel solid additive-assisted layer-by-layer (SAA-LBL) processing technique for fabricating high-efficiency OSCs.
  • To investigate the impact of fatty acid (FA) as a solid additive on the morphology and performance of PM6:Y6 based OSCs.

Main Methods:

  • Incorporation of a solid additive, fatty acid (FA), into the polymer donor (PM6) solution to induce pre-phase separation.
  • Utilizing layer-by-layer (LBL) processing with chloroform solution dripping to facilitate acceptor (Y6) diffusion and control morphology.
  • Fabrication and characterization of binary single-junction OSCs using the SAA-LBL method.

Main Results:

  • SAA-LBL processing resulted in refined phase-separated domains and vertical phase separation, optimizing charge transport and exciton dissociation.
  • PM6:Y6 based binary single-junction OSCs achieved a champion PCE of 18.16%.
  • The SAA-LBL method demonstrated broad applicability, achieving record PCEs of 19.02% (100 nm) and 16.44% (250 nm) for PM6:L8-BO based devices.

Conclusions:

  • The SAA-LBL processing is a simple yet effective method for controlling morphology in high-efficiency OSCs.
  • This methodology shows significant promise for boosting the industrial manufacturing of organic solar cells.
  • The developed technique offers a pathway to enhance device performance through precise morphological control.