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Solution-Processed 8-Hydroquinolatolithium as Effective Cathode Interlayer for High-Performance Polymer Solar Cells.

Wenqing Liu1, Tao Liang1, Qi Chen2

  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, State Key Laboratory of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University , Hangzhou 310027, P. R. China.

ACS Applied Materials & Interfaces
|March 26, 2016
PubMed
Summary

Solution-processed 8-hydroxyquinolinatolithium (s-Liq) enhances polymer solar cell performance by improving electron extraction and increasing open-circuit voltage. This cathode interlayer boosts power conversion efficiency and device stability.

Keywords:
LiqPCEPSCcathode interlayerstabilitywork function

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Bulk heterojunction polymer solar cells (PSCs) require efficient charge extraction for optimal performance.
  • Cathode interlayers play a crucial role in facilitating electron extraction and improving device energetics.

Purpose of the Study:

  • To investigate the efficacy of solution-processed 8-hydroxyquinolinatolithium (s-Liq) as a cathode interlayer in PSCs.
  • To elucidate the mechanism by which s-Liq enhances device performance.

Main Methods:

  • Fabrication of PSCs utilizing s-Liq as a cathode interlayer.
  • Characterization using ultraviolet photoelectron spectroscopy (UPS) to analyze work function modification.
  • Surface potential analysis via scanning Kelvin probe microscopy (SKPM) to study interfacial properties.

Main Results:

  • s-Liq effectively lowers the work function of the Al cathode, promoting ohmic contact with the fullerene acceptor.
  • Formation of an interfacial dipole at the s-Liq/Al interface enhances the built-in potential and charge transport.
  • PSCs with s-Liq achieved a power conversion efficiency (PCE) of 9.04%, outperforming devices with evaporated Liq or PFN interlayers.
  • s-Liq-based devices demonstrated good operational stability, retaining 75% (N2) and 45% (air) of initial PCE after 7 days.

Conclusions:

  • Solution-processed s-Liq is a highly effective cathode interlayer for enhancing PSC performance.
  • The improved efficiency is attributed to better electron extraction and enhanced built-in potential.
  • s-Liq presents a promising material for developing high-performance and stable polymer solar cells.