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Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization
07:32

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

Published on: January 29, 2017

Nanoparticle agglomeration in polymer-based solar cells.

Jonathon W Kiel1, Aaron P R Eberle, Michael E Mackay

  • 1Materials Science and Engineering Department, University of Delaware, Newark, Delaware 19716, USA.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Annealing polymer solar cells significantly alters nanoscale morphology. Phenyl-C61-butyric acid methyl ester (PCBM) coarsens within poly(3-hexylthiophene) (P3HT), improving device performance despite increased photoluminescence.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Renewable Energy

Background:

  • Polymer-based solar cells offer a promising renewable energy source.
  • Understanding nanoscale morphology is crucial for optimizing device efficiency.
  • Annealing is a common post-processing step for polymer solar cells.

Purpose of the Study:

  • To investigate the morphological changes in polymer solar cells after annealing.
  • To correlate nanoscale structural evolution with device performance and photoluminescence.

Main Methods:

  • Small angle neutron scattering (SANS) was employed to probe nanoscale morphology.
  • Characterization of blend morphology in poly(3-hexylthiophene) (P3HT) and Phenyl-C61-butyric acid methyl ester (PCBM) systems.

Main Results:

  • Initial spin coating results in good dispersion of PCBM within the P3HT phase.
  • Annealing leads to coarsening of the PCBM structure, indicated by increased scattering at small wave vectors.
  • Morphological changes correlate with enhanced device performance and a simultaneous increase in photoluminescence.

Conclusions:

  • Annealing significantly impacts the nanoscale morphology of P3HT:PCBM solar cells.
  • The observed morphological coarsening is linked to improved device efficiency.
  • The concurrent increase in photoluminescence suggests complex photophysical processes are influenced by annealing.