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Author: search.filters.author.Chen, Fang-ChungSubject: search.filters.subject.Absorption

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    Organic solar cells comprising multiple-device stacked structures exhibiting complementary absorption behavior
    (2014-01-01)
    Lin, Wei-Ting
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    Lin, Yen-Tseng
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    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.
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    Photoerasable Organic Nonvolatile Memory Devices Based on Hafnium Silicate Insulators
    (2011-12-01)
    Chen, Fang-Chung
    ;
    Chang, Hsiao-Fen
    ;
    光電工程學系
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    顯示科技研究所
    ;
    Department of Photonics
    We have prepared photoerasable organic nonvolatile memories using high-dielectric (high-k) hafnium silicate as device insulators. The high-k material can effectively lower the operating voltage of the organic memory devices. The nonvolatile memory can be written by applying a gate bias and be effectively erased by photon illumination. The spectral study of the photoinduced recovery effect indicated that the erasing mechanism should be relevant to the recombination between the trapped charges and the photogenerated exctions.