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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 19, Iss. S5 — Sep. 12, 2011
  • pp: A1155–A1164

Broadband wide-angle antireflection enhancement in AZO/Si shell/core subwavelength grating structures with hydrophobic surface for Si-based solar cells

Jung Woo Leem, Young Min Song, and Jae Su Yu  »View Author Affiliations


Optics Express, Vol. 19, Issue S5, pp. A1155-A1164 (2011)
http://dx.doi.org/10.1364/OE.19.0A1155


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Abstract

Broadband wide-angle antireflection characteristics of aluminum-doped zinc oxide (AZO)/silicon (Si) shell/core subwavelength grating (SWG) structures with a hydrophobic surface, together with theoretical prediction using a rigorous coupled-wave analysis simulation, were investigated for Si-based solar cells. The AZO films with different thicknesses were deposited on Si SWGs by rf magnetron sputtering method, which forms a shell/core structure. The AZO/Si shell/core SWGs reduced significantly the surface reflection compared to the AZO films/Si substrate. The coverage of AZO films on Si SWGs improved the antireflective property over a wider incident angle. The AZO/Si shell/core SWG structure with a 200 nm-thick AZO layer deposited at an rf power of 200 W exhibited a water contact angle of 123°. This structure also exhibited a low average reflectance of ~2% over a wide wavelength range of 300-2100 nm with a solar weighted reflectance of 2.8%, maintaining a reflectance of < 9.2% at wavelengths of 300-2100 nm up to the incident angle of θi = 70°. The effective electrical properties of AZO films in AZO/Si shell/core SWGs were also analyzed.

© 2011 OSA

OCIS Codes
(310.1210) Thin films : Antireflection coatings
(220.4241) Optical design and fabrication : Nanostructure fabrication
(050.6624) Diffraction and gratings : Subwavelength structures

History
Original Manuscript: June 9, 2011
Revised Manuscript: July 25, 2011
Manuscript Accepted: August 8, 2011
Published: August 23, 2011

Citation
Jung Woo Leem, Young Min Song, and Jae Su Yu, "Broadband wide-angle antireflection enhancement in AZO/Si shell/core subwavelength grating structures with hydrophobic surface for Si-based solar cells," Opt. Express 19, A1155-A1164 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-S5-A1155


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