Broadband and ultrahigh optical haze thin films with self-aggregated alumina nanowire bundles for photovoltaic applications

Gumin Kang, Kyuyoung Bae, Minwoo Nam, Doo Hyun Ko, Kyoungsik Kim, Willie J. Padilla

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Optical haze is one of the most important factors to be considered in the development of efficient photonic and optoelectronic devices by manipulating the light behavior. In this work, we fabricated a high optical haze film composed of self-aggregated alumina nanowire arrays and applied this novel structure to improve the energy conversion efficiency of organic photovoltaic (OPV) devices. We controlled the optical properties of films, such as total/diffuse transmittance and haze value, by changing the packing density of nanowires during the wet etching process. By optimizing the etching conditions, the nanowire bundle arrays enabled us to obtain an ultrahigh optical haze value up to ∼98% or high transmittance up to ∼96%. By simply attaching the haze film onto the front glass surface of the OPV device, we significantly elongated the optical path length in the active layer, thereby achieving an overall efficiency of 9.01% out of the bare device of 8.17%, resulting in 10.28% enhancement.

Original languageEnglish
Pages (from-to)2650-2656
Number of pages7
JournalEnergy and Environmental Science
Volume8
Issue number9
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

Optical films
Aluminum Oxide
haze
aluminum oxide
Nanowires
Alumina
Thin films
etching
transmittance
Photonic devices
Wet etching
Energy conversion
Optoelectronic devices
Conversion efficiency
Etching
Optical properties
active layer
Glass
optical property
glass

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

Cite this

Kang, Gumin ; Bae, Kyuyoung ; Nam, Minwoo ; Ko, Doo Hyun ; Kim, Kyoungsik ; Padilla, Willie J. / Broadband and ultrahigh optical haze thin films with self-aggregated alumina nanowire bundles for photovoltaic applications. In: Energy and Environmental Science. 2015 ; Vol. 8, No. 9. pp. 2650-2656.
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Broadband and ultrahigh optical haze thin films with self-aggregated alumina nanowire bundles for photovoltaic applications. / Kang, Gumin; Bae, Kyuyoung; Nam, Minwoo; Ko, Doo Hyun; Kim, Kyoungsik; Padilla, Willie J.

In: Energy and Environmental Science, Vol. 8, No. 9, 01.01.2015, p. 2650-2656.

Research output: Contribution to journalArticle

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