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A lactam building block for efficient polymer solar cells.

Jiamin Cao1, Liu Qian, Futai Lu

  • 1National Center for Nanoscience and Technology, Beijing 100190, China. ding@nanoctr.cn xhqiu@nanoctr.cn.

Chemical Communications (Cambridge, England)
|June 26, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed a new lactam acceptor unit, [7,7'-bidithieno[3,2-b:2',3'-d]pyridine]-5,5'(4H,4'H)-dione (BDTP). This led to a donor-acceptor copolymer achieving over 9% power conversion efficiency in solar cells.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Polymer Chemistry

Background:

  • Developing efficient organic solar cells requires novel donor and acceptor materials.
  • Lactam-based acceptor units offer potential for tuning electronic properties.

Purpose of the Study:

  • To synthesize and characterize a new lactam acceptor unit, [7,7 '-bidithieno[3,2-b:2 ',3 '-d]pyridine]-5,5 '(4H,4 'H)-dione (BDTP).
  • To fabricate and evaluate organic solar cells based on a novel donor-acceptor (D-A) copolymer incorporating BDTP.

Main Methods:

  • Synthesis of the BDTP lactam acceptor unit.
  • Polymerization to create the PThBDTP D-A copolymer using thiophene as the donor.
  • Fabrication and characterization of PThBDTP:PC71BM bulk heterojunction solar cells.

Main Results:

  • The synthesized BDTP unit was successfully incorporated into the PThBDTP copolymer.
  • PThBDTP:PC71BM solar cells demonstrated a power conversion efficiency (PCE) of 9.13%.
  • An open-circuit voltage (V(oc)) of 0.96 V was achieved for the fabricated solar cells.

Conclusions:

  • The novel BDTP unit is a promising building block for high-performance D-A copolymers.
  • PThBDTP represents one of the few D-A copolymers achieving PCEs exceeding 9% in organic solar cells.
  • This study highlights the potential of lactam-based acceptors in advancing organic photovoltaic technology.