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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S3 — May. 5, 2014
  • pp: A651–A662

Nanoimprinted backside reflectors for a-Si:H thin-film solar cells: Critical role of absorber front textures

Yao-Chung Tsao, Christian Fisker, and Thomas Garm Pedersen  »View Author Affiliations

Optics Express, Vol. 22, Issue S3, pp. A651-A662 (2014)

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The development of optimal backside reflectors (BSRs) is crucial for future low cost and high efficiency silicon (Si) thin-film solar cells. In this work, nanostructured polymer substrates with aluminum coatings intended as BSRs were produced by positive and negative nanoimprint lithography (NIL) techniques, and hydrogenated amorphous silicon (a-Si:H) was deposited hereon as absorbing layers. The relationship between optical properties and geometry of front textures was studied by combining experimental reflectance spectra and theoretical simulations. It was found that a significant height variation on front textures plays a critical role for light-trapping enhancement in solar cell applications. As a part of sample preparation, a transfer NIL process was developed to overcome the problem of low heat deflection temperature of polymer substrates during solar cell fabrication.

© 2014 Optical Society of America

OCIS Codes
(350.6050) Other areas of optics : Solar energy
(240.3695) Optics at surfaces : Linear and nonlinear light scattering from surfaces
(050.6624) Diffraction and gratings : Subwavelength structures
(050.6875) Diffraction and gratings : Three-dimensional fabrication

ToC Category:
Light Trapping for Photovoltaics

Original Manuscript: January 13, 2014
Revised Manuscript: February 20, 2014
Manuscript Accepted: March 7, 2014
Published: March 19, 2014

Yao-Chung Tsao, Christian Fisker, and Thomas Garm Pedersen, "Nanoimprinted backside reflectors for a-Si:H thin-film solar cells: Critical role of absorber front textures," Opt. Express 22, A651-A662 (2014)

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