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Nonhalogenated Dual-Slot-Die Processing Enables High-Efficiency Organic Solar Cells.

Jingwei Xue1, Heng Zhao1, Baojun Lin1

  • 1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China.

Advanced Materials (Deerfield Beach, Fla.)
|June 14, 2022
PubMed
Summary
This summary is machine-generated.

A new dual-slot-die sequential processing (DSDS) method enables high-efficiency, eco-friendly organic solar cells (OSCs). This approach avoids toxic solvents and improves performance by creating a graded bulk-heterojunction morphology.

Keywords:
dual-slot-die coatingkinetic statesorganic solar cellssequential processing

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Organic Electronics

Background:

  • Organic solar cells (OSCs) show promise for next-generation photovoltaics, but their commercialization is hindered by processing challenges.
  • Current methods often use toxic solvents and bulk-heterojunctions (BHJs) that lead to charge recombination, limiting power conversion efficiencies (PCEs).

Purpose of the Study:

  • To develop an efficient and environmentally friendly processing strategy for organic solar cells.
  • To address limitations of spin-coating, toxic solvents, and BHJ morphology in OSC fabrication.

Main Methods:

  • A dual-slot-die sequential processing (DSDS) strategy was employed for continuous solution supply and nonhalogen solvent use.
  • This method facilitated the creation of a graded-BHJ morphology without post-treatment.

Main Results:

  • An excellent PCE of 17.07% was achieved using o-xylene in an open-air environment.
  • High PCEs over 14% were maintained across a wide range of active-layer thicknesses.
  • The DSDS process was shown to form a graded-BHJ morphology through donor-acceptor diffusion and aggregation.

Conclusions:

  • The DSDS approach effectively enhances charge transport and inhibits recombination, leading to high PCEs in OSCs.
  • This method offers a pathway towards high-efficiency, eco-friendly organic solar cells.
  • The DSDS strategy may be applicable to other organic photoelectric devices.