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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 18, Iss. S3 — Sep. 13, 2010
  • pp: A308–A313

Improved optical transmission and current matching of a triple-junction solar cell utilizing sub-wavelength structures

M.-Y. Chiu, C.-H. Chang, M.-A. Tsai, F.-Y. Chang, and Peichen Yu  »View Author Affiliations

Optics Express, Vol. 18, Issue S3, pp. A308-A313 (2010)

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Sub-wavelength antireflective structures are fabricated on a silicon nitride passivation layer of a Ga0.5In0.5P/GaAs/Ge triple-junction solar cell using polystyrene nanosphere lithography followed by anisotropic etching. The fabricated structures enhance optical transmission in the ultraviolet wavelength range, compared to a conventional single-layer antireflective coating (ARC). The transmission improvement contributes to an enhanced photocurrent, which is also verified by the external quantum efficiency characterization of the fabricated solar cells. Under one-sun illumination, the short-circuit current of a cell with sub-wavelength structures is enhanced by 46.1% and 3.4% due to much improved optical transmission and current matching, compared to cells without an ARC and with a conventional SiNx ARC, respectively. Further optimizations of the sub-wavelength structures including the periodicity and etching depth are conducted by performing comprehensive calculations based on a rigorous couple-wave analysis method.

© 2010 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:

Original Manuscript: May 21, 2010
Revised Manuscript: July 16, 2010
Manuscript Accepted: July 16, 2010
Published: July 30, 2010

M.-Y. Chiu, C.-H. Chang, M.-A. Tsai, F.-Y. Chang, and Peichen Yu, "Improved optical transmission and current matching of a triple-junction solar cell utilizing sub-wavelength structures," Opt. Express 18, A308-A313 (2010)

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