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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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Updated: May 24, 2026

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
08:29

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

Published on: January 10, 2017

Parallel-like bulk heterojunction polymer solar cells.

Liqiang Yang1, Huaxing Zhou, Samuel C Price

  • 1Curriculum in Applied Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3287, United States.

Journal of the American Chemical Society
|March 8, 2012
PubMed
Summary
This summary is machine-generated.

A new parallel-like bulk heterojunction (PBHJ) solar cell design combines simple processing with multiple polymers. This approach enhances short-circuit current and overall efficiency compared to single-junction cells.

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Area of Science:

  • Organic electronics
  • Photovoltaics
  • Materials science

Background:

  • Single-junction bulk heterojunction (BHJ) solar cells offer simple processing and low cost.
  • Tandem solar cells achieve higher efficiencies by incorporating multiple light-absorbing materials but often involve complex configurations.
  • A need exists for efficient solar cell architectures that balance performance with manufacturing simplicity.

Purpose of the Study:

  • To introduce a novel parallel-like bulk heterojunction (PBHJ) solar cell architecture.
  • To combine the benefits of single-junction BHJ cells (simplicity, low cost) with those of tandem cells (multiple light absorbers).
  • To investigate the charge transport and performance characteristics of the PBHJ design.

Main Methods:

  • Fabrication of PBHJ solar cells utilizing multiple donor polymers and fullerene-enriched domains.
  • Characterization of device performance, including short-circuit current (Jsc) and open-circuit voltage (Voc).
  • Comparison of PBHJ performance against traditional single-junction BHJ devices.

Main Results:

  • The PBHJ architecture facilitates charge carrier transport through distinct donor-polymer channels to electrodes, mimicking a parallel connection.
  • PBHJ solar cells exhibited a short-circuit current (Jsc) nearly equivalent to the sum of individual subcells.
  • The open-circuit voltage (Voc) of PBHJ devices was found to be intermediate between those of the subcells.
  • Preliminary optimization led to significant improvements: up to 40% increase in Jsc and 30% increase in overall efficiency (η) compared to single-junction BHJ cells.

Conclusions:

  • The parallel-like bulk heterojunction (PBHJ) is a viable and promising new approach for organic solar cells.
  • PBHJ cells effectively integrate multiple light-absorbing polymers while maintaining a simple device structure.
  • This architecture offers a pathway to enhanced photovoltaic performance without compromising processing advantages.