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, Peichen Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)A308-A313
JournalOptics Express
Volume18
Issue numberS3
DOIs
StatePublished - 21 Jun 2010

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