Absorption of light in InP nanowire arrays

Nicklas Anttu*, Alireza Abrand, Damir Asoli, Magnus Heurlin, Ingvar Åberg, Lars Samuelson, Magnus Borgström

*Korresponderande författare för detta arbete

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

67 Citeringar (Scopus)

Sammanfattning

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. [Figure not available: see fulltext.]

OriginalspråkEngelska
Sidor (från-till)816-823
Antal sidor8
TidskriftNano Research
Volym7
Utgåva6
DOI
StatusPublicerad - jun 2014
MoE-publikationstypA1 Tidskriftsartikel-refererad

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