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Related Concept Videos

P-N junction01:11

P-N junction

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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...
673

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Updated: Sep 9, 2025

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20.64% Efficient and Stable Binary Organic Solar Cells via Thermodynamic-Engineered Interlayer Diffusion and Exciton

Kangbo Sun1, Yufei Wang1, Guangye Zhang1

  • 1College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, 518118, China.

Advanced Materials (Deerfield Beach, Fla.)
|August 30, 2025
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Summary

Hot-substrate processing enhances organic solar cell performance by controlling active-layer assembly dynamics. This method improves efficiency and operational stability, paving the way for advanced organic photovoltaic devices.

Keywords:
device engineeringinterlayer diffusionnon‐radiative recombinationorganic solar cellssequential processing

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Area of Science:

  • Organic electronics
  • Materials science
  • Photovoltaics

Background:

  • Thermodynamics is crucial for organic solar cell active-layer optimization, but temperature-dependent mechanisms limit efficiency.
  • Understanding these mechanisms is key to advancing organic solar cell technology.

Purpose of the Study:

  • To investigate temperature-controlled assembly dynamics during sequential processing (SqP) of organic solar cell active layers using real-time thermal imaging.
  • To elucidate how hot-substrate (HS) processing influences active-layer morphology and performance compared to traditional hot-solution techniques.

Main Methods:

  • Real-time thermal imaging to monitor active-layer assembly dynamics during sequential processing (SqP).
  • Hot-substrate (HS) processing technique with higher temperature and prolonged heating compared to hot-solution methods.
  • Fabrication and characterization of organic solar cell devices with varying active-layer thicknesses and hole transport layers.

Main Results:

  • HS processing accelerates liquid-phase reorganization and nucleation, promoting layer interpenetration and optimal donor content.
  • Achieved a highly crystalline fibrous structure, enhancing hole mobility and suppressing non-radiative recombination.
  • Demonstrated improved device efficiency (19.75% for 100 nm D18/eC9) and operational stability (90% retention after 270 h).
  • Exceeded 20% efficiency in multiple systems using 2PACZ as the hole transport layer.
  • HS-processed 300 nm binary devices achieved over 18.12% efficiency.

Conclusions:

  • Hot-substrate processing is an effective strategy for optimizing organic solar cell active layers.
  • The technique enhances morphological control, leading to improved photovoltaic performance and stability.
  • This approach offers a pathway to achieving higher efficiencies in organic solar cells, including thicker active layers.