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Related Concept Videos

P-N junction01:11

P-N junction

717
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...
717

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Vertically optimized phase separation with improved exciton diffusion enables efficient organic solar cells with

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  • 1School of Chemistry, Beihang University, 100191, Beijing, P. R. China.

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|May 2, 2022
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Summary

Researchers developed efficient thick-film organic solar cells (OSCs) using a polymer donor and two non-fullerene acceptors. This approach enhances exciton diffusion and vertical phase separation, achieving high power conversion efficiencies for large-area solar panels.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Thick active layers are crucial for large-area organic solar cells (OSCs) via roll-to-roll printing.
  • Increased active layer thickness typically leads to reduced device efficiency.

Purpose of the Study:

  • To fabricate efficient thick-film OSCs with active layers exceeding 300 nm.
  • To investigate strategies for overcoming efficiency losses in thicker OSC active layers.

Main Methods:

  • Fabrication of OSCs using a ternary blend of one polymer donor and two non-fullerene acceptors.
  • Optimization of active layer morphology through a layer-by-layer approach to control vertical phase separation.
  • Characterization of exciton diffusion length and device performance.

Main Results:

  • Achieved a power conversion efficiency of 17.31% for a 300 nm thick OSC (certified 16.9%).
  • Demonstrated a high short-circuit current density of 28.36 mA cm⁻² and fill factor of 73.0% for the 300 nm device.
  • Obtained an efficiency of 15.21% for a 500 nm thick OSC, indicating scalability.

Conclusions:

  • Synergistic effects of enlarged exciton diffusion length and graded vertical phase separation enable high efficiency in thick-film OSCs.
  • The developed ternary blend and fabrication method are promising for efficient, large-area organic solar panel production.
  • This study offers valuable insights for designing and fabricating high-performance thick-film organic solar cells.