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High efficiency air-processed dithienogermole-based polymer solar cells.

Iordania Constantinou1, Tzung-Han Lai, Dewei Zhao

  • 1Department of Materials Science and Engineering, University of Florida , Gainesville, Florida 32611, United States.

ACS Applied Materials & Interfaces
|February 11, 2015
PubMed
Summary
This summary is machine-generated.

Air exposure before encapsulation significantly degrades organic solar cell performance. Power conversion efficiency drops by ~10% after just 10 minutes of air exposure, impacting device stability.

Keywords:
air processingcharge mobilityconjugated polymersdithienogermolefullerenesorganic photovoltaicssolar cells

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Polymer Chemistry

Background:

  • Organic solar cells (OSCs) offer a promising alternative to traditional silicon photovoltaics.
  • The stability and performance of OSCs are highly sensitive to environmental factors during fabrication.
  • Understanding the impact of air exposure on device components is crucial for improving OSC longevity.

Purpose of the Study:

  • To investigate the effect of pre-encapsulation air exposure on the performance of polymer-based organic solar cells.
  • To quantify the degradation in power conversion efficiency (PCE) with varying air exposure times.
  • To identify the underlying mechanisms responsible for performance loss.

Main Methods:

  • Fabrication of poly(dithienogermole-alt-thienopyrrolodione) p(DTG-TPD)/PC71BM blend-based OSCs.
  • Controlled air exposure of devices for durations ranging from minutes to hours prior to encapsulation.
  • Electrical characterization (e.g., J-V measurements under AM1.5 illumination) to determine PCE.
  • Optical simulations to complement experimental findings.

Main Results:

  • A ~10% decrease in PCE was observed after 10 minutes of air exposure, with PCE dropping from 8.5% to 7.7%.
  • Further air exposure up to 3 hours resulted in PCE leveling off at approximately 7.04%.
  • Degradation is attributed to interfacial issues (electrode oxidation/hydration) and reduced hole transport in the active layer.

Conclusions:

  • Pre-encapsulation air exposure significantly impairs the performance of p(DTG-TPD)/PC71BM based OSCs.
  • Both electrode interfaces and active layer properties are negatively affected by oxygen and moisture.
  • Optimizing fabrication conditions to minimize air exposure is critical for achieving high-performance and stable organic solar cells.