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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...
1.1K

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Related Experiment Video

Updated: Jan 13, 2026

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
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A Multifunctional 2D-Conjugated BDT Polymer Interlayer Enables Over 20% Organic Solar Cells.

Mingfei Li1, Ye Xu1, Wenchao Zhao2

  • 1School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China.

Advanced Materials (Deerfield Beach, Fla.)
|October 28, 2025
PubMed
Summary

A new polymer donor, PBDB-tvt, was designed for organic solar cells (OSCs). This material improves active layer morphology and light absorption, leading to a record power conversion efficiency (PCE) of 20.3%.

Keywords:
2D‐BDT polymermaterial designorganic solar cellsphase distributionsequential deposition

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • The morphology of the active layer in organic solar cells (OSCs) critically impacts charge transport and recombination.
  • Conventional bulk heterojunction (BHJ) methods often lead to poor vertical phase distribution, limiting power conversion efficiency (PCE).

Purpose of the Study:

  • To design a novel 2D conjugated polymer donor, PBDB-tvt, with enhanced properties for OSCs.
  • To investigate the effect of a multifunctional interlayer on active layer morphology and photovoltaic performance.

Main Methods:

  • Synthesized a 2D conjugated polymer donor (PBDB-tvt) with a benzodithiophene (BDT) core and a chlorinated alkylthio-thiophene-vinyl-thiophene (tvt) side chain.
  • Utilized PBDB-tvt as an interlayer in a hybrid device configuration (functional modification layer/BHJ) for sequential deposition.
  • Analyzed the impact of the tailored structure on phase distribution, light utilization, and photovoltaic parameters.

Main Results:

  • The PBDB-tvt polymer exhibited up-shifted energy levels, enhanced optical absorption, and improved charge transport.
  • The hybrid device configuration with the PBDB-tvt interlayer showed improved phase distribution and enhanced short-wavelength light utilization.
  • Key photovoltaic parameters, including open-circuit voltage, short-circuit current density, and fill factor, were simultaneously increased.

Conclusions:

  • The designed multifunctional interlayer plays a crucial role in optimizing active layer morphology and enhancing light absorption in OSCs.
  • The novel PBDB-tvt polymer and hybrid device architecture offer a viable strategy for significantly improving OSC performance.
  • A record PCE of 20.3% was achieved, demonstrating the potential of this approach for advancing organic solar cell technology.