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Layer-by-Layer Solution-Processed Organic Solar Cells with Perylene Diimides as Acceptors.

Ming Hu1, Youdi Zhang1,2, Xia Liu1

  • 1College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.

ACS Applied Materials & Interfaces
|June 21, 2021
PubMed
Summary

Layer-by-layer (LBL) processing enhances organic solar cell (OSC) performance by optimizing vertical phase separation. Perylene diimide (PDI) acceptors fabricated using LBL methods show superior charge transport and higher power conversion efficiencies compared to traditional bulk heterojunction (BHJ) devices.

Keywords:
film morphologylayer-by-layer solution processorganic solar cells (OSCs)perylene diimides (PDIs)vertical component distribution

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Layer-by-layer (LBL) sequential solution processing is a key strategy for improving organic solar cell (OSC) performance.
  • Perylene diimide (PDI) derivatives are known for excellent photoelectric properties but are underexplored in LBL OSCs.

Purpose of the Study:

  • To investigate the fabrication and performance of PDI-based LBL OSCs.
  • To compare LBL OSCs with traditional bulk heterojunction (BHJ) OSCs using PDI acceptors.
  • To elucidate the morphological and electronic differences between LBL and BHJ devices.

Main Methods:

  • Fabrication of LBL and BHJ OSCs using three PDI acceptors (TBDPDI-C5, TBDPDI-C11, SdiPDI).
  • Device optimization and characterization including photoluminescence quenching, light intensity dependence, carrier mobility, AFM, TEM, GIWAXS, and DXPS.
  • Comparative analysis of charge transport, morphology, and vertical component distribution.

Main Results:

  • LBL OSCs demonstrated superior charge transport and more balanced carrier mobility than BHJ counterparts.
  • LBL films exhibited favorable morphology and proper vertical component distribution, leading to reduced exciton recombination.
  • All three PDI-based LBL OSCs outperformed their BHJ equivalents, with TBDPDI-C5 achieving a power conversion efficiency of 6.11%.

Conclusions:

  • LBL solution processing is a highly effective method for fabricating high-performance PDI-based OSCs.
  • The enhanced performance of LBL OSCs is attributed to improved charge transport, morphology, and vertical phase separation.
  • This study marks the first successful application of LBL solution processing for high-efficiency PDI small molecular acceptor OSCs.