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Absorption of light in InP nanowire arrays

In English

Författare

Summary, in English

An understanding of the absorption of light is essential for efficient photovoltaic and photodetection applications with III-V nanowire arrays. Here, we correlate experiments with modeling and verify experimentally the predicted absorption of light in InP nanowire arrays for varying nanowire diameter and length. We find that 2,000 nm long nanowires in a pitch of 400 nm can absorb 94% of the incident light with energy above the band gap and, as a consequence, light which in a simple ray-optics description would be travelling between the nanowires can be efficiently absorbed by the nanowires. Our measurements demonstrate that the absorption for long nanowires is limited by insertion reflection losses when light is coupled from the air top-region into the array. These reflection losses can be reduced by introducing a smaller diameter to the nanowire-part closest to the air top-region. For nanowire arrays with such a nanowire morphology modulation, we find that the absorptance increases monotonously with increasing diameter of the rest of the nanowire.

Publiceringsår

2014

Språk

Engelska

Sidor

816-823

Publikation/Tidskrift/Serie

Nano Reseach

Volym

7

Issue

6

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Condensed Matter Physics
  • Nano Technology

Nyckelord

  • indium phosphide
  • semiconductor
  • nanowire
  • absorption of light

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1998-0124