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Patterned radial GaAs nanopillar solar cells.

Giacomo Mariani1, Ping-Show Wong, Aaron M Katzenmeyer

  • 1Electrical Engineering Department , University of California at Los Angeles, Los Angeles, California 90095, United States. giacomomariani@ucla.edu

Nano Letters
|May 25, 2011
PubMed
Summary
This summary is machine-generated.

Gallium arsenide (GaAs) nanopillar radial p-n junctions were fabricated using catalyst-free metal-organic chemical vapor deposition, achieving 2.54% power conversion efficiency. This method minimizes contamination, leading to improved device performance and leakage current.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • Gallium arsenide (GaAs) is a key material for high-efficiency photovoltaics.
  • Nanostructured designs, such as nanopillars, offer enhanced light absorption and carrier collection.
  • Catalyst-free growth methods are desirable to avoid performance-degrading contamination.

Purpose of the Study:

  • To demonstrate photovoltaic devices based on GaAs nanopillar radial p-n junctions.
  • To investigate the performance and characteristics of these catalyst-free nanostructured solar cells.
  • To explore the impact of fabrication methods on device efficiency and leakage currents.

Main Methods:

  • Catalyst-free selective-area metal-organic chemical vapor deposition (MOCVD) for GaAs nanopillar growth.
  • Lithographic definition of dense, large-area vertical nanowire arrays.
  • Characterization using current-voltage measurements, scanning photocurrent microscopy, and external quantum efficiency (EQE).
  • Evaluation of different top electrode schemes via Hall effect, sheet resistance, and optical transmittance measurements.

Main Results:

  • Achieved power conversion efficiencies of 2.54% under AM 1.5 G illumination.
  • Demonstrated a high rectification ratio of 213 at ±1 V.
  • Observed low leakage currents of approximately 236 nA at -1 V due to the absence of metal catalyst contamination.
  • Scanning photocurrent microscopy confirmed independent nanowire function with peak photocurrents around 1 nA at 544 nm.
  • Photocarrier extraction was found to be highly dependent on the transparent contact oxide.

Conclusions:

  • Catalyst-free MOCVD enables efficient fabrication of GaAs nanopillar radial p-n junction solar cells.
  • The nanostructure design and clean fabrication process contribute to high performance and low leakage.
  • Further optimization of transparent conductive oxides is crucial for enhancing photocarrier extraction and overall device efficiency.