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Related Experiment Video

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Interplay between efficiency and device architecture for small molecule organic solar cells.

Graeme Williams1, Sibi Sutty, Hany Aziz

  • 1Department of Electrical and Computer Engineering & Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue, Waterloo, ON, CanadaN2L 3G1. g3willia@uwaterloo.ca.

Physical Chemistry Chemical Physics : PCCP
|May 7, 2014
PubMed
Summary

Small molecule organic solar cells (OSCs) show improved reliability. The bulk heterojunction (BHJ)/acceptor architecture offers the best performance by balancing charge generation and collection.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Small molecule organic solar cells (OSCs) are gaining interest due to enhanced reliability compared to polymer solar cells.
  • Understanding device architecture is crucial for optimizing OSC performance.

Purpose of the Study:

  • To systematically investigate five different small molecule OSC device architectures.
  • To comprehensively understand charge transport behavior across various donor:acceptor mixing concentrations.

Main Methods:

  • Fabrication and characterization of five OSC device architectures (planar heterojunction (PHJ), bulk heterojunction (BHJ), and planar-mixed).
  • Transient photocurrent decay measurements to analyze charge sweep-out, recombination, and space charge effects.

Main Results:

  • The BHJ/acceptor architecture, with high C60 acceptor content, achieved the highest OSC performance.
  • Optimal performance resulted from balanced charge generation and collection in the BHJ/acceptor structure.
  • Other architectures were limited by hole transport, leading to hole accumulation and space charge effects.

Conclusions:

  • The BHJ/acceptor architecture is superior for small molecule OSCs.
  • Charge transport dynamics, including space charge effects, significantly impact device performance.
  • Optimizing donor:acceptor ratios and architecture is key to advancing OSC technology.