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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S1 — Jan. 13, 2014
  • pp: A167–A178

Suppressing lossy-film-induced angular mismatches between reflectance and transmittance extrema: optimum optical designs of interlayers and AR coating for maximum transmittance into active layers of CIGS solar cells

Yin-Jung Chang  »View Author Affiliations

Optics Express, Vol. 22, Issue S1, pp. A167-A178 (2014)

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The investigation of optimum optical designs of interlayers and antireflection (AR) coating for achieving maximum average transmittance (Tave) into the CuIn1−xGaxSe2 (CIGS) absorber of a typical CIGS solar cell through the suppression of lossy-film-induced angular mismatches is described. Simulated-annealing algorithm incorporated with rigorous electromagnetic transmission-line network approach is applied with criteria of minimum average reflectance (Rave) from the cell surface or maximum Tave into the CIGS absorber. In the presence of one MgF2 coating, difference in Rave associated with optimum designs based upon the two distinct criteria is only 0.3% under broadband and nearly omnidirectional incidence; however, their corresponding Tave values could be up to 14.34% apart. Significant Tave improvements associated with the maximum-Tave-based design are found mainly in the mid to longer wavelengths and are attributed to the largest suppression of lossy-film-induced angular mismatches over the entire CIGS absorption spectrum. Maximum-Tave-based designs with a MgF2 coating optimized under extreme deficiency of angular information is shown, as opposed to their minimum-Rave-based counterparts, to be highly robust to omnidirectional incidence.

© 2014 Optical Society of America

OCIS Codes
(310.1210) Thin films : Antireflection coatings
(310.6860) Thin films : Thin films, optical properties
(350.6050) Other areas of optics : Solar energy
(310.4165) Thin films : Multilayer design

ToC Category:

Original Manuscript: November 4, 2013
Revised Manuscript: December 19, 2013
Manuscript Accepted: December 25, 2013
Published: January 9, 2014

Yin-Jung Chang, "Suppressing lossy-film-induced angular mismatches between reflectance and transmittance extrema: optimum optical designs of interlayers and AR coating for maximum transmittance into active layers of CIGS solar cells," Opt. Express 22, A167-A178 (2014)

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