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Solution-processed and high-performance organic solar cells using small molecules with a benzodithiophene unit.

Jiaoyan Zhou1, Yi Zuo, Xiangjian Wan

  • 1Key Laboratory for Functional Polymer Materials and Centre for Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.

Journal of the American Chemical Society
|May 25, 2013
PubMed
Summary

New organic small molecules based on a benzo[1,2-b:4,5-b']dithiophene unit achieve high power conversion efficiencies (PCEs) in organic photovoltaic devices. These materials offer improved performance for solution-processed solar cells.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Renewable Energy

Background:

  • Organic photovoltaic devices (OPVs) are a promising area of renewable energy research.
  • Developing efficient and stable materials is crucial for advancing OPV technology.
  • Small molecules offer advantages in processability and tunability for bulk-heterojunction solar cells.

Purpose of the Study:

  • To design and synthesize novel small molecules for solution-processed bulk-heterojunction solar cells.
  • To investigate the structure-property relationships of benzo[1,2-b:4,5-b\]dithiophene (BDT)-based materials.
  • To achieve high power conversion efficiencies (PCEs) in organic photovoltaic devices.

Main Methods:

  • Synthesis of three novel small molecules: DR3TBDTT, DR3TBDTT-HD, and DR3TBD2T, featuring a BDT core.
  • Fabrication of bulk-heterojunction organic photovoltaic devices using these small molecules as donors and PC71BM as the acceptor.
  • Performance characterization of the OPVs under standard AM 1.5G solar irradiation (100 mW cm(-2)).

Main Results:

  • Achieved power conversion efficiencies (PCEs) of 8.12% for DR3TBDTT-based devices (certified 7.61%) and 8.02% for DR3TBDT2T-based devices.
  • Improved PCEs were attributed to enhanced short-circuit current density.
  • High open-circuit voltage and fill factor were maintained, indicating efficient charge generation and transport.

Conclusions:

  • The designed BDT-based small molecules are effective materials for high-performance organic photovoltaic devices.
  • The strategy of combining advantages of small molecules and polymers led to improved device efficiency.
  • These findings contribute to the development of efficient and solution-processable organic solar cells.