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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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Related Experiment Video

Updated: May 21, 2026

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells
14:37

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

Published on: November 5, 2014

Carbon nanotube solar cells.

Colin Klinger1, Yogeshwari Patel, Henk W Ch Postma

  • 1Department of Physics and Astronomy, California State University Northridge, Northridge, California, United States of America.

Plos One
|June 2, 2012
PubMed
Summary

We developed all-carbon solar cells using spray-paint techniques. Lower semiconducting nanotube concentrations improved performance by reducing electrical shorts, offering a promising, sustainable energy solution.

Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Traditional solar cells often rely on rare or expensive materials like indium and platinum.
  • Dye-based solar cells are susceptible to degradation and bleaching, limiting their lifespan.
  • High-grade semiconductor processing equipment is typically required for efficient solar cell fabrication.

Purpose of the Study:

  • To demonstrate proof-of-concept for all-carbon solar cells.
  • To explore fabrication methods that avoid rare materials and complex equipment.
  • To investigate the relationship between carbon nanotube concentration and solar cell performance.

Main Methods:

  • Fabrication of photoactive electrodes using predominantly semiconducting carbon nanotubes.

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  • Assembly of solar cells with a counter electrode of mixed carbon nanotubes or graphite.
  • Utilizing a liquid electrolyte and spray-paint technique for ease of manufacturing.
  • Analyzing the impact of carbon nanotube concentration on photoconversion efficiency.

    • Main Results:

    • All-carbon solar cells were successfully fabricated using a spray-paint method.
    • Cells utilizing lower concentrations of carbon nanotubes on the active electrode showed superior performance.
    • The improved performance at lower concentrations was attributed to reduced electrical shorts from metallic nanotubes.
    • Optimization strategies led to significant improvements in cell efficiency.

    Conclusions:

    • All-carbon solar cells offer a sustainable and cost-effective alternative to conventional photovoltaic devices.
    • Careful control of carbon nanotube concentration is crucial for optimizing solar cell efficiency.
    • Future advancements in producing semiconducting-only carbon nanotube films hold potential for further efficiency gains.