Browsing by Author "Tsai, M. -A."

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Improved optical transmission and current matching of a triple-junction solar cell utilizing sub-wavelength structures
(2010-09-13)
Chiu, M. -Y.
;
Chang, C. -H.
;
Tsai, M. -A.
;
Chang, F. -Y.
;
Yu, Peichen
Sub-wavelength antireflective structures are fabricated on a silicon nitride passivation layer of a Ga(0.5)In(0.5)P/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 SiN(x) 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. (C) 2010 Optical Society of America