An easily accessible isoindigo-based polymer for high-performance polymer solar cells

Area of Science:

• Materials Science
• Organic Electronics
• Photovoltaics

Background:

• Developing efficient organic solar cells requires novel polymer semiconductors.
• Low optical band gap polymers are crucial for absorbing a broader solar spectrum.

Purpose of the Study:

• To design and synthesize a new low-band-gap alternating copolymer for high-performance polymer solar cells.
• To evaluate the photovoltaic properties of the synthesized polymer.

Main Methods:

• Chemical synthesis of a terthiophene-isoindigo alternating copolymer.
• Fabrication and characterization of polymer solar cells using the synthesized polymer and PC(71)BM as the acceptor.

Main Results:

• Successful synthesis of the novel low-band-gap alternating copolymer.
• Achieved a power conversion efficiency of 6.3% in polymer solar cells.
• This efficiency is a record for polymers with an optical band gap below 1.5 eV.

Conclusions:

• Isoindigo moieties are effective electron-deficient units for donor-acceptor polymers.
• The developed polymer shows significant potential for high-performance organic photovoltaics.
• This study advances the development of efficient, low-band-gap materials for solar energy conversion.