Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array

Barbara Fazio; Pietro Artoni; Maria Antonia Iatì; Cristiano D'Andrea; Maria Josè Lo Faro; Salvatore Del Sorbo; Stefano Pirotta; Pietro Giuseppe Gucciardi; Paolo Musumeci; Cirino Salvatore Vasi; Rosalba Saija; Matteo Galli; Francesco Priolo; Alessia Irrera

doi:10.1038/lsa.2016.62

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Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array

Original Articles

- Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array
- Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array
- LSA 2016年5卷第2期
- Affiliations：
  
  1.CNR-IPCF, Istituto per i Processi Chimico Fisici, 98158 Messina, Italy
  2.Dipartimento di Fisica e Astronomia, Università di Catania, 95123 Catania, Italy
  3.CNR-MATIS IMM, Istituto per la Microelettronica e Microsistemi, 95123 Catania, Italy
  4.Dipartimento di Fisica, Università degli Studi di Pavia, 27100 Pavia, Italy
  5.Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, 98166 Messina, Italy
  6.Scuola Superiore di Catania, Università di Catania, via Valdisavoia, 9, 95123 Catania, Italy
- Author bio：
  
  B Fazio, Email: fazio@ipcf.cnr.it
  A Irrera, Email: irrera@ipcf.cnr.it
- Funds：
- DOI：10.1038/lsa.2016.62
  中图分类号：
- 纸质出版日期：2016-06，
  
  网络出版日期：2016-01-07，
  
  收稿日期：2015-08-02，
  
  修回日期：2015-12-07，
  
  录用日期：2016-01-03
- Accepted：
Scan QR Code
Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array[J]. LSA, 2016,5(2).

Fazio, B. et al. Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array. Light: Science & Applications, 5, e16062 (2016).
Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array[J]. LSA, 2016,5(2). DOI： 10.1038/lsa.2016.62.

Fazio, B. et al. Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array. Light: Science & Applications, 5, e16062 (2016). DOI： 10.1038/lsa.2016.62.

摘要

Abstract

We report on the unconventional optical properties exhibited by a two-dimensional array of thin Si nanowires arranged in a random fractal geometry and fabricated using an inexpensive

fast and maskless process compatible with Si technology. The structure allows for a high light-trapping efficiency across the entire visible range

attaining total reflectance values as low as 0.1% when the wavelength in the medium matches the length scale of maximum heterogeneity in the system. We show that the random fractal structure of our nanowire array is responsible for a strong in-plane multiple scattering

which is related to the material refractive index fluctuations and leads to a greatly enhanced Raman scattering and a bright photoluminescence. These strong emissions are correlated on all length scales according to the refractive index fluctuations. The relevance and the perspectives of the reported results are discussed as promising for Si-based photovoltaic and photonic applications.

关键词

Keywords

light trappingmultiple scatteringRaman enhancementrandom fractalsilicon nanowires

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