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Proceedings Paper

High efficiency triple-junction solar cells employing biomimetic antireflective structures
Author(s): Meng-Yih Chiu; Chia-Hua Chang; Feng-Yu Chang; Peichen Yu
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Paper Abstract

In this work, we demonstrate a thorough device design, fabrication, characterization, and analysis of biomimetic antireflective structures implemented on a Ga0.5In0.5P/GaAs/Ge triple-junction solar cell. The sub-wavelength structures are fabricated on a silicon nitride passivation layer 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 the enhanced photocurrent, which is also verified by the external quantum efficiency characterization of fabricated solar cells. Under one-sun illumination, the short-circuit current of a cell with a biomimetic structures is enhanced by 24.1% and 2.2% due to much improved optical transmission and current matching, compared to cells without an ARC and with a conventional ARC, respectively. Further optimizations of the biomimetic structures including the periodicity and etching depth are conducted by performing comprehensive calculations based on a rigorous couple-wave analysis method.

Paper Details

Date Published: 21 February 2011
PDF: 7 pages
Proc. SPIE 7933, Physics and Simulation of Optoelectronic Devices XIX, 79330N (21 February 2011); doi: 10.1117/12.876850
Show Author Affiliations
Meng-Yih Chiu, National Chiao Tung Univ. (Taiwan)
Chia-Hua Chang, National Chiao Tung Univ. (Taiwan)
Feng-Yu Chang, National Chiao Tung Univ. (Taiwan)
Peichen Yu, National Chiao Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7933:
Physics and Simulation of Optoelectronic Devices XIX
Bernd Witzigmann; Fritz Henneberger; Yasuhiko Arakawa; Alexandre Freundlich, Editor(s)

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