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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S6 — Oct. 20, 2014
  • pp: A1431–A1439

Silicon nanodisk array design for effective light trapping in ultrathin c-Si

Inho Kim, Doo Seok Jeong, Wook Seong Lee, Won Mok Kim, Taek-Sung Lee, Doh-Kwon Lee, Jong-Han Song, Joon-Kon Kim, and Kyeong-Seok Lee  »View Author Affiliations


Optics Express, Vol. 22, Issue S6, pp. A1431-A1439 (2014)
http://dx.doi.org/10.1364/OE.22.0A1431


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Abstract

The use of ultrathin c-Si (crystalline silicon) wafers thinner than 20 μm for solar cells is a very promising approach to realize dramatic reduction in cell cost. However, the ultrathin c-Si requires highly effective light trapping to compensate optical absorption reduction. Conventional texturing in micron scale is hardly applicable to the ultrathin c-Si wafers; thus, nano scale texturing is demanded. In general, nanotexturing is inevitably accompanied by surface area enlargements, which must be minimized in order to suppress surface recombination of minority carriers. In this study, we demonstrate using optical simulations that periodic c-Si nanodisk arrays of short heights less than 200 nm and optimal periods are very useful in terms of light trapping in the ultrathin c-Si wafers while low surface area enlargements are maintained. Double side texturing with the nanodisk arrays leads to over 90% of the Lambertian absorption limit while the surface area enlargement is kept below 1.5.

© 2014 Optical Society of America

OCIS Codes
(040.6040) Detectors : Silicon
(220.0220) Optical design and fabrication : Optical design and fabrication
(350.6050) Other areas of optics : Solar energy

ToC Category:
Light Trapping for Photovoltaics

History
Original Manuscript: July 22, 2014
Manuscript Accepted: August 9, 2014
Published: August 28, 2014

Citation
Inho Kim, Doo Seok Jeong, Wook Seong Lee, Won Mok Kim, Taek-Sung Lee, Doh-Kwon Lee, Jong-Han Song, Joon-Kon Kim, and Kyeong-Seok Lee, "Silicon nanodisk array design for effective light trapping in ultrathin c-Si," Opt. Express 22, A1431-A1439 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S6-A1431


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