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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...
Schottky Barrier Diode01:27

Schottky Barrier Diode

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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Related Experiment Video

Updated: May 10, 2026

Developing High Performance GaP/Si Heterojunction Solar Cells
10:31

Developing High Performance GaP/Si Heterojunction Solar Cells

Published on: November 16, 2018

Barium: an efficient cathode layer for bulk-heterojunction solar cells.

Vinay Gupta1, Aung Ko Ko Kyaw, Dong Hwan Wang

  • 1Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090, USA. drvinaygupta@netscape.net

Scientific Reports
|June 12, 2013
PubMed
Summary
This summary is machine-generated.

Barium (Ba) cathode layers significantly boost organic solar cell performance by enhancing fill factor (FF) to 75.1%. This novel approach suppresses recombination, improving charge collection and power conversion efficiency.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Bulk-heterojunction (BHJ) solar cells are a promising renewable energy technology.
  • Achieving high fill factor (FF) and power conversion efficiency (PCE) in organic solar cells remains a key challenge.
  • Efficient charge extraction and minimized recombination losses are crucial for device performance.

Purpose of the Study:

  • To investigate the effect of a Barium (Ba) cathode layer on the performance of p-DTS(FBTTh2)2/PC71BM BHJ solar cells.
  • To analyze the impact of Ba on recombination mechanisms and charge transport properties.
  • To identify a novel cathode interlayer for enhancing organic solar cell efficiency.

Main Methods:

  • Fabrication of BHJ solar cells with varying Barium (Ba) cathode layer thicknesses.
  • Characterization of device performance using current-voltage (J-V) measurements under varying light intensities.
  • Analysis of recombination mechanisms, including trap-assisted Shockley-Read-Hall (SRH) and bimolecular recombination.
  • Evaluation of series and shunt resistances.

Main Results:

  • A Barium (Ba) cathode layer enhanced the fill factor (FF) of the organic solar cell to 75.1%, a record high.
  • External quantum efficiency exceeded 80%.
  • Ba suppressed trap-assisted SRH recombination and shifted recombination towards bimolecular.
  • Ba significantly decreased series resistance and increased shunt resistance, improving charge collection probability.

Conclusions:

  • Barium (Ba) serves as an effective cathode interlayer for BHJ solar cells, outperforming existing materials.
  • The use of Ba leads to a substantial increase in FF and overall power conversion efficiency.
  • This finding has significant implications for the future development of high-performance organic solar cells.