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Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells
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High efficiency polymer solar cells with vertically modulated nanoscale morphology.

Ankit Kumar1, Gang Li, Ziruo Hong

  • 1Department of Material Science and Engineering, University of California, Los Angeles, CA 90095, USA.

Nanotechnology
|May 8, 2009
PubMed
Summary

Researchers created a vertical composition gradient in polymer solar cells using poly(3-hexylthiophene) and [6,6]-phenyl-C61-butyric acid methyl ester. This modification enhanced power conversion efficiency to 4.5% by reducing series resistance.

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Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Published on: January 29, 2017

Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Nanoscale morphology critically influences charge transport in polymer bulk heterojunction (BHJ) solar cells.
  • Vertical phase separation is a key area of focus for controlling 3D morphology in BHJ solar cells.

Purpose of the Study:

  • To engineer the donor and acceptor distribution within a BHJ polymer solar cell.
  • To create a vertical composition gradient by enriching the active layer with donors near the anode and acceptors near the cathode.

Main Methods:

  • Utilized [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as the acceptor material.
  • Thermally deposited PCBM onto a poly(3-hexylthiophene) (P3HT):PCBM active layer.
  • Achieved a vertical composition gradient in the BHJ structure.

Main Results:

  • Fabricated a polymer solar cell with an enhanced power conversion efficiency of 4.5%.
  • Observed a direct correlation between the enhanced efficiency and a decrease in the device's series resistance.
  • Demonstrated successful modification of BHJ morphology for improved performance.

Conclusions:

  • Vertical composition gradients are an effective strategy for optimizing BHJ solar cell performance.
  • Reduced series resistance is a key factor in achieving higher power conversion efficiencies.
  • The P3HT:PCBM system with controlled morphology shows promise for efficient organic photovoltaics.