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Related Concept Videos

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Related Experiment Video

Updated: Apr 30, 2026

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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Inverted bulk-heterojunction solar cell with cross-linked hole-blocking layer.

Yasemin Udum1, Patrick Denk2, Getachew Adam2

  • 1Institute for Organic Solar Cells, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria ; Institute of Science and Technology, Department of Advanced Technologies, Gazi University, 06570 Ankara, Turkey.

Organic Electronics
|May 13, 2014
PubMed
Summary

Researchers developed a cross-linked polyethylenimine (PEI) hole-blocking layer for bulk-heterojunction solar cells. This layer improves device fabrication reproducibility without compromising solar cell efficiency.

Keywords:
Device designElectrical contactOrganic solar cellStability

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Organic Electronics

Background:

  • Bulk-heterojunction solar cells require efficient charge transport layers.
  • Polyethylenimine (PEI) is a promising material for hole-blocking layers.
  • Improving the stability and reproducibility of these layers is crucial for commercialization.

Purpose of the Study:

  • To develop and evaluate a cross-linked polyethylenimine (PEI) based hole-blocking layer for bulk-heterojunction solar cells.
  • To investigate the impact of cross-linking on PEI layer properties and solar cell performance.
  • To assess the solvent resistance and reproducibility of the cross-linked PEI layer.

Main Methods:

  • Synthesis of cross-linked PEI using five different ether-based cross-linkers.
  • Fabrication of bulk-heterojunction solar cells incorporating the cross-linked PEI layer.
  • Characterization of solar cell efficiency and device reproducibility.
  • Evaluation of PEI layer adhesion and solvent resistance.

Main Results:

  • All tested cross-linkers yielded comparable solar cell efficiencies.
  • The cross-linked PEI layer demonstrated excellent adhesion to indium-tin-oxide electrodes, unaffected by processing solvents.
  • The cross-linked PEI layer functioned effectively with various donor-acceptor blends.
  • Cross-linking significantly improved the reproducibility of the solar cell fabrication process.

Conclusions:

  • Cross-linked PEI serves as an effective hole-blocking layer in bulk-heterojunction solar cells.
  • While not enhancing solvent resistance, cross-linking improves device fabrication consistency.
  • The developed cross-linked PEI layer offers a viable solution for reproducible organic solar cell manufacturing.