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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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All-Polymer Solar Cells Sequentially Solution Processed from Hydrocarbon Solvent with a Thick Active Layer.

Yajie Wang1, Chaoyue Zhao1, Ziqi Cai2

  • 1College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China.

Polymers
|August 26, 2023
PubMed
Summary

Thicker organic solar cells processed from toluene using sequential processing (SqP) maintain high efficiency. This method improves film properties, reduces recombination, and enhances charge extraction for industrial applications.

Keywords:
all-polymer solar cellshydrocarbon solvent processingsequential processingthick-film active layer

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • All-polymer solar cells (all-PSCs) show promise due to excellent film formation, mechanical, and thermal properties.
  • High-efficiency all-PSCs typically require thin active layers processed from chloroform.
  • Industrialization demands thicker active layers processed from low-vapor pressure solvents like hydrocarbons.

Purpose of the Study:

  • To develop a method for fabricating thicker all-PSC active layers using toluene.
  • To investigate the impact of sequential processing (SqP) on device performance with increasing film thickness.
  • To compare SqP with traditional blend-casting methods for thicker active layers.

Main Methods:

  • Utilized toluene, a high-boiling point hydrocarbon solvent.
  • Employed sequential processing (SqP) for active layer deposition.
  • Fabricated and characterized all-PSCs with varying active layer thicknesses.

Main Results:

  • SqP mitigated the efficiency drop typically observed with increasing film thickness.
  • SqP promoted favorable vertical phase segregation in the active layer.
  • Devices processed with SqP exhibited reduced trap-assisted recombination, enhanced charge extraction, and longer charge carrier lifetimes compared to blend-cast devices.

Conclusions:

  • Sequential processing (SqP) is a viable strategy for achieving high-efficiency, thicker all-polymer solar cells using hydrocarbon solvents.
  • SqP enables improved morphology control, leading to enhanced device performance and reduced recombination losses.
  • This approach addresses key challenges for the industrialization of all-PSCs.