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Energy Express

  • Editor: Christian Seassal
  • Vol. 21, Iss. S5 — Sep. 9, 2013
  • pp: A808–A820

Light trapping in thin-film solar cells with randomly rough and hybrid textures

Piotr Kowalczewski, Marco Liscidini, and Lucio Claudio Andreani  »View Author Affiliations

Optics Express, Vol. 21, Issue S5, pp. A808-A820 (2013)

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We study light-trapping in thin-film silicon solar cells with rough interfaces. We consider solar cells made of different materials (c-Si and μc-Si) to investigate the role of size and nature (direct/indirect) of the energy band gap in light trapping. By means of rigorous calculations we demonstrate that the Lambertian Limit of absorption can be obtained in a structure with an optimized rough interface. We gain insight into the light trapping mechanisms by analysing the optical properties of rough interfaces in terms of Angular Intensity Distribution (AID) and haze. Finally, we show the benefits of merging ordered and disordered photonic structures for light trapping by studying a hybrid interface, which is a combination of a rough interface and a diffraction grating. This approach gives a significant absorption enhancement for a roughness with a modest size of spatial features, assuring good electrical properties of the interface. All the structures presented in this work are compatible with present-day technologies, giving recent progress in fabrication of thin monocrystalline silicon films and nanoimprint lithography.

© 2013 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(050.1950) Diffraction and gratings : Diffraction gratings
(240.0310) Optics at surfaces : Thin films
(240.5770) Optics at surfaces : Roughness

ToC Category:

Original Manuscript: May 23, 2013
Revised Manuscript: June 20, 2013
Manuscript Accepted: June 20, 2013
Published: August 1, 2013

Piotr Kowalczewski, Marco Liscidini, and Lucio Claudio Andreani, "Light trapping in thin-film solar cells with randomly rough and hybrid textures," Opt. Express 21, A808-A820 (2013)

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