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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...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...

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Related Experiment Video

Updated: Jun 1, 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

Sticky interconnect for solution-processed tandem solar cells.

Vincent C Tung1, Jaemyung Kim, Laura J Cote

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA.

Journal of the American Chemical Society
|May 28, 2011
PubMed
Summary
This summary is machine-generated.

Graphene oxide enhances conductive polymer conductivity, creating a novel metal-free solder. This material simplifies fabricating high-efficiency organic tandem solar cells.

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Published on: September 12, 2014

Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Graphene oxide (GO) acts as a 2D copolymer, guiding material assembly via π-π stacking and hydrogen bonding.
  • Conducting polymers like PEDOT:PSS are crucial for organic electronics but face fabrication challenges.

Purpose of the Study:

  • To investigate the synergistic effects of mixing graphene oxide (GO) with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS).
  • To develop a novel, metal-free conductive material for organic optoelectronic devices.

Main Methods:

  • Mixing GO and PEDOT:PSS in water to form a viscous dispersion.
  • Casting the dispersion into thin films.
  • Fabricating polymer tandem solar cells using the GO/PEDOT film as an adhesive interconnect.

Main Results:

  • GO significantly enhances the electrical conductivity of PEDOT:PSS by altering its chain conformation and morphology.
  • The GO/PEDOT mixture forms a sticky gel functioning as a metal-free solder.
  • A proof-of-concept polymer tandem solar cell was successfully fabricated using a direct adhesive lamination process.

Conclusions:

  • GO/PEDOT is a promising metal-free solder for organic optoelectronics.
  • This material simplifies the fabrication of complex organic tandem architectures.
  • Facilitates the construction of high-efficiency tandem solar cells with diverse solution-processable materials.