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Related Concept Videos

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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...
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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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Updated: Apr 24, 2026

Developing High Performance GaP/Si Heterojunction Solar Cells
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Self-Assembled Monolayer Anode Enables 7% Efficiency in Y6-Based Quasi-Homojunction Solar Cells With 4% Donor

Man Hing Suen1, Zhuoqiong Zhang1, Yidan An2

  • 1Department of Physics and Institute of Advanced Materials Hong Kong Baptist University Hong Kong SAR China.

Small Science
|April 23, 2026
PubMed
Summary

Quasi-homojunction organic solar cells (OSCs) with 4% donor content achieve 7.1% efficiency. Novel anodes induce vertical phase separation for enhanced charge extraction and stability in these Y6-based devices.

Keywords:
homojunction cellsorganic solar cellsquasi‐homojunctionself‐assembled monolayervertical phase separation

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Organic solar cells (OSCs) offer flexible and low-cost energy solutions.
  • Bulk heterojunction (BHJ) OSCs provide high efficiency but suffer from morphological complexity and instability.
  • Homojunction (HJ) OSCs offer simplicity but limited performance.

Purpose of the Study:

  • To investigate the potential of quasi-homojunction (QHJ) organic solar cells (OSCs) as a hybrid architecture.
  • To enhance charge separation, transport, and stability in OSCs by minimizing donor content.
  • To achieve high power conversion efficiency (PCE) in Y6-based QHJ OSCs.

Main Methods:

  • Fabrication of QHJ OSCs using a nonfullerene acceptor matrix with a minimal donor fraction (4 wt%).
  • Replacement of the standard PEDOT:PSS anode with a novel self-assembled monolayer (SAM) anode.
  • Characterization of device performance, including power conversion efficiency (PCE) and stability.
  • Analysis of the induced vertical phase separation and its impact on morphology and charge extraction.

Main Results:

  • Achieved a power conversion efficiency (PCE) of 7.1% in Y6-based QHJ OSCs with only 4 wt% donor content.
  • Demonstrated efficient charge extraction due to vertical phase separation induced by the SAM anode.
  • Maintained consistent performance across a wide range of active layer thicknesses (55-180 nm).
  • Exhibited excellent operational stability, combining the benefits of HJ simplicity and BHJ performance.

Conclusions:

  • The QHJ architecture offers a promising strategy to overcome the limitations of both BHJ and HJ OSCs.
  • Novel SAM anodes are effective in inducing vertical phase separation for improved charge extraction and device stability.
  • QHJ OSCs represent a viable pathway towards high-performance, stable, and easily processable organic solar cells.