Browsing by Author "Chou, Chu-Hsien"

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Organic solar cells comprising multiple-device stacked structures exhibiting complementary absorption behavior
(2014-01-01)
Lin, Wei-Ting
;
Lin, Yen-Tseng
;
Chou, Chu-Hsien
;
Chen, Fang-Chung
;
Hsu, Chain-Shu
We developed organic solar cells based on multiple-device stacked structures featuring complementary absorption behavior. The first, semitransparent (ST) subcell featured an inverted structure; its anode comprised a MoO3/Ag bilayer. This structure provided a transmittance of greater than 35% in the visible region. The second subcell, featuring a low-band-gap small molecule in its photoactive layer, was stacked onto the ST device; the two subcells could be connected either in series or in parallel. Because the two subcells exhibited complementary absorption behavior, their stacked structure connected in parallel displayed a power conversion efficiency of 4.37%, greater than those of the isolated subcells. (C) 2013 Elsevier B.V. All rights reserved.
Reduced optical loss in mechanically stacked multi-junction organic solar cells exhibiting complementary absorptions
(2014-03-10)
Lin, Yen-Tseng
;
Chou, Chu-Hsien
;
Chen, Fang-Chung
;
Chu, Chih-Wei
;
Hsu, Chain-Shu
This paper describes a promising approach toward preparing effective electrical and optical interconnections for tandem organic photovoltaic devices (OPVs). The first subcell featured a semi-transparent electrode, which allowed a portion of the solar irradiation to pass through and to enter the second subcell exhibiting complementary absorption behavior. The resulting multi-junction OPV had multiple contacts such that the subcells could be easily connected either in series or in parallel. More importantly, we used UV-curable epoxy to "mechanically" stack the two subcells and to eliminate the air gap between them, thereby reducing the optical loss induced by mismatches of refractive indices. Therefore, an improved power conversion efficiency of approximately 6.5% has been achieved. (C) 2014 Optical Society of America