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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization
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High performance asymmetrical push-pull small molecules end-capped with cyanophenyl for solution-processed solar

Hang Gao1, Yanqin Li, Lihui Wang

  • 1School of Chemistry, Dalian University of Technology, Dalian, China. lxyin@dlut.edu.cn.

Chemical Communications (Cambridge, England)
|July 24, 2014
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Summary

Two novel D-π-A small molecules were synthesized for organic electronics. One molecule, TPATDPPCN, achieved a 5.94% power conversion efficiency (PCE), showing promise for solar cell applications.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photovoltaics

Background:

  • Small molecules with donor-pi-acceptor (D-π-A) structures are crucial for organic electronics.
  • Developing efficient and stable organic materials is key to advancing solar cell technology.

Purpose of the Study:

  • To synthesize novel asymmetrical push-pull small molecules for potential use in organic solar cells.
  • To investigate the structure-property relationships of these new materials.

Main Methods:

  • Synthesis of two novel asymmetrical D-π-A small molecules.
  • Characterization of molecular structure and optical properties.
  • Fabrication and testing of organic solar cells incorporating the synthesized molecules.

Main Results:

  • Successful synthesis of two novel D-π-A small molecules featuring triphenylamine and diketopyrrolopyrrole units.
  • TPATDPPCN, end-capped with cyanophenyl, exhibited a low optical band gap of 1.65 eV.
  • An impressive power conversion efficiency (PCE) of 5.94% was achieved for TPATDPPCN in a device.

Conclusions:

  • The synthesized asymmetrical push-pull small molecules show potential for organic photovoltaic applications.
  • The D-π-A design incorporating triphenylamine and diketopyrrolopyrrole is effective for achieving desirable optoelectronic properties.
  • Further optimization could lead to even higher efficiencies in organic solar cells.