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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...
Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...

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Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells
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III-nitride core–shell nanowire arrayed solar cells.

Jonathan J Wierer1, Qiming Li, Daniel D Koleske

  • 1Sandia National Laboratories, Albuquerque, NM 87185, USA. jwierer@sandia.gov

Nanotechnology
|April 28, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a new hybrid solar cell using nanowires and a film architecture. This design improves efficiency and light absorption for advanced solar energy applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Traditional solar cells face limitations in efficiency and light absorption.
  • Integrating nanowires into solar cells presents processing challenges.
  • III-nitride materials offer potential for high-efficiency solar cells but require innovative architectures.

Purpose of the Study:

  • To demonstrate a novel hybrid nanowire-film solar cell architecture.
  • To overcome integration challenges associated with nanowire-based devices.
  • To enhance light absorption and carrier collection for improved solar cell performance.

Main Methods:

  • Fabrication of vertically aligned InGaN/GaN multi-quantum well core-shell nanowires.
  • Electrical connection of nanowires using a coalesced p-InGaN canopy layer.
  • Integration into a hybrid nanowire-film architecture for planar device processing.

Main Results:

  • The hybrid structure enabled standard planar device fabrication.
  • Achieved higher indium composition in InGaN layers due to elastic strain relief.
  • Demonstrated efficient carrier collection in thinner layers and enhanced light trapping.
  • Working solar cells showed photoresponse up to 2.1 eV with ~1 mA cm(-2) short-circuit current density under 1 sun AM1.5G illumination.

Conclusions:

  • The hybrid nanowire-film architecture is a viable approach for III-nitride solar cells.
  • This design addresses key challenges in nanowire device integration.
  • The demonstrated device serves as a proof-of-concept for high-efficiency solar energy conversion using nanowires.