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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Hyperbranched polymer as an acceptor for polymer solar cells.

Jicheng Zhang1, Sufei Xie1, Xuejuan Zhang1

  • 1Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China. xuxj@bnu.edu.cn zsbo@bnu.edu.cn.

Chemical Communications (Cambridge, England)
|December 15, 2016
PubMed
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Researchers developed a novel hyperbranched polymer acceptor (HP-PDI) for polymer solar cells (PSCs). This new material significantly boosts power conversion efficiency by preventing molecular aggregation, paving the way for high-performance PSCs.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Renewable Energy

Background:

  • Polymer solar cells (PSCs) are a promising renewable energy technology.
  • Developing efficient polymer acceptors is crucial for improving PSC performance.
  • Molecular aggregation in acceptors can hinder device efficiency.

Purpose of the Study:

  • To design and synthesize a novel hyperbranched polymer acceptor, HP-PDI.
  • To evaluate the performance of HP-PDI in PSCs.
  • To investigate the effect of hyperbranched structure on acceptor aggregation and device efficiency.

Main Methods:

  • Synthesis of the hyperbranched polymer acceptor (HP-PDI).
  • Fabrication and characterization of PSC devices using HP-PDI.
  • Comparison of device performance with a small molecular acceptor (SM-PDI).
  • Analysis of molecular aggregation using structural properties.

Main Results:

  • Successfully designed and synthesized HP-PDI.
  • Achieved a power conversion efficiency of 2.15% in PSCs based on HP-PDI.
  • Demonstrated a 14-fold increase in efficiency compared to devices using SM-PDI.
  • Observed that the hyperbranched structure effectively suppresses PDI molecule aggregation.

Conclusions:

  • HP-PDI is a viable and highly efficient polymer acceptor for PSCs.
  • Hyperbranched architecture is a promising strategy for developing high-performance PSC acceptors.
  • This work opens new avenues for efficient polymer solar cell design.