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Highly efficient all-polymer solar cells achieved over 4.5% power conversion efficiency using intermixed PTB7-Th donor and P(NDI2OD-T2) acceptor polymers. Additives enhanced morphology and charge transport for improved performance.

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Area of Science:

  • Organic electronics
  • Polymer science
  • Photovoltaics

Background:

  • All-polymer solar cells offer potential for flexible and low-cost energy solutions.
  • Achieving high power conversion efficiencies requires optimized morphology and charge transport.
  • PTB7-Th donor and P(NDI2OD-T2) acceptor polymers are promising materials for organic photovoltaics.

Purpose of the Study:

  • To develop highly efficient all-polymer solar cells.
  • To investigate the effect of blend morphology on device performance.
  • To explore the role of additives in optimizing polymer solar cell characteristics.

Main Methods:

  • Fabrication of all-polymer solar cells using PTB7-Th donor and P(NDI2OD-T2) acceptor polymers.
  • Formulation of highly intermixed polymer blends.
  • Incorporation of 1,8-diiodooctane as an additive.
  • Characterization of blend morphology, charge transport, and device performance.

Main Results:

  • Achieved power conversion efficiencies exceeding 4.5%.
  • Demonstrated favorable nanophase morphology due to low interfacial tension and face-on π-π stacking.
  • Observed enhanced electron mobility, external quantum efficiency, and short-circuit current density (JSC) with additive incorporation.
  • Tuned crystallinity and orientation of P(NDI2OD-T2) acceptors using 1,8-diiodooctane.

Conclusions:

  • Highly intermixed blends of PTB7-Th and P(NDI2OD-T2) enable efficient all-polymer solar cells.
  • Optimized morphology and charge transport are crucial for high photovoltaic performance.
  • 1,8-diiodooctane is an effective additive for enhancing electron mobility and overall device efficiency.