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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...
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Indirect generation involves an...
The Z-Scheme of Electron Transport in Photosynthesis01:34

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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...

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Updated: Jun 9, 2026

Morphology Control for Fully Printable Organic&#8211;Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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Published on: January 10, 2017

Rethinking Charge Transport and Recombination in Donor-Diluted Organic Solar Cells.

Chen Wang1, Christopher Wöpke1, Toni Seiler1

  • 1Institut für Physik, Technische Universität Chemnitz, Chemnitz, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|June 8, 2026
PubMed
Summary
This summary is machine-generated.

Even at low donor fractions, organic solar cells maintain charge generation if a continuous donor network exists. Performance is limited by topology-controlled transport and non-Langevin recombination.

Keywords:
Langevin reduction factorSmoluchowskicharge transportconductivitynongeminate recombinationorganic solar cellstransport resistance

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Published on: September 12, 2014

Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Bulk-heterojunction organic solar cells (OSCs) are promising for flexible electronics.
  • Optimizing morphology and charge dynamics is crucial for high-performance OSCs.
  • Understanding donor dilution effects is key to improving OSC stability and efficiency.

Purpose of the Study:

  • To investigate the impact of donor fractions (1-45%) on PM6:Y12 OSC performance.
  • To correlate morphology, charge transport, and recombination with device efficiency.
  • To elucidate the mechanisms limiting performance in donor-diluted OSCs.

Main Methods:

  • Systematic variation of donor fractions in PM6:Y12 blends.
  • Utilizing complementary structural and spectroscopic methods.
  • Analyzing charge transport using percolation models and recombination kinetics.

Main Results:

  • A continuous PM6 network forms below 5% donor content, preserving charge extraction.
  • Charge transport follows a 3D percolation model, governed by network topology.
  • A transition to dispersive Smoluchowski-type recombination occurs below 5% donor fraction, exceeding Langevin predictions.
  • Reduced fill factors result from topology-limited hole transport despite high photogeneration.

Conclusions:

  • Strong donor dilution in OSCs preserves photogeneration if a continuous donor network is maintained.
  • Device performance in donor-diluted blends is limited by topology-controlled transport and non-Langevin recombination.
  • These findings offer insights into optimizing organic solar cell design for enhanced efficiency and stability.