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Related Concept Videos

P-N junction01:11

P-N junction

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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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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A polymer tandem solar cell with 10.6% power conversion efficiency.

Jingbi You1, Letian Dou, Ken Yoshimura

  • 1Department of Material Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, USA.

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|February 7, 2013
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Researchers developed a new low-bandgap polymer, enabling the first certified polymer solar cell efficiency over 10%. This breakthrough advances polymer solar cell technology for broader solar spectrum utilization and reduced energy loss.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Renewable Energy

Background:

  • Tandem structures enhance polymer solar cell efficiency by utilizing more solar spectrum and minimizing thermalization losses.
  • High-performance low-bandgap polymers are crucial for advancing tandem solar cell technology but have been a limiting factor.

Purpose of the Study:

  • To develop a high-performance, low-bandgap polymer for efficient polymer solar cells.
  • To demonstrate the potential of this new polymer in single-junction and tandem solar cell configurations.

Main Methods:

  • Synthesis of a novel low-bandgap polymer: poly[2,7-(5,5-bis-(3,7-dimethyloctyl)-5H-dithieno[3,2-b:2',3'-d]pyran)-alt-4,7-(5,6-difluoro-2,1,3-benzothia diazole)] with a bandgap of 1.38 eV.
  • Fabrication and characterization of single-junction polymer solar cells.
  • Fabrication and testing of solution-processed tandem polymer solar cells.

Main Results:

  • The new polymer exhibits a bandgap of 1.38 eV, high charge carrier mobility, and a deep highest occupied molecular orbital.
  • Single-junction devices achieved over 60% external quantum efficiency and spectral response up to 900 nm, with a power conversion efficiency of 7.9%.
  • Solution-processed tandem solar cells reached a certified power conversion efficiency of 10.6%, surpassing the 10% threshold for the first time in polymer solar cells.

Conclusions:

  • The developed low-bandgap polymer overcomes previous limitations, enabling significant advancements in polymer solar cell performance.
  • This work paves the way for highly efficient, solution-processed tandem polymer solar cells.
  • The certified 10.6% efficiency marks a milestone, demonstrating the viability of polymer-based photovoltaics for practical applications.