Broadband Light-Trapping Enhancement in an Ultrathin Film a-Si Absorber Using Whispering Gallery Modes and Guided Wave Modes with Dielectric Surface-Textured Structures

Authors

  • Gumin Kang,

    1. Address School of Mechanical Engineering, Yonsei University, Address 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
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  • Haesung Park,

    1. Address School of Mechanical Engineering, Yonsei University, Address 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
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  • Dongheok Shin,

    1. Address School of Mechanical Engineering, Yonsei University, Address 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
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  • Seunghwa Baek,

    1. Address School of Mechanical Engineering, Yonsei University, Address 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
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  • Minjung Choi,

    1. Address School of Mechanical Engineering, Yonsei University, Address 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
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  • Dai-Hyuk Yu,

    1. Division of Physical Metrology, Address Korea Research Institute of Standards and Science, Address 267 Gajeong-Ro, Yuseong-Gu, Daejeon 305-340, South Korea
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  • Kyoungsik Kim,

    Corresponding author
    1. Address School of Mechanical Engineering, Yonsei University, Address 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
    • Address School of Mechanical Engineering, Yonsei University, Address 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea.===

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  • Willie J. Padilla

    1. Department of Physics, Boston College, Address 140 Commonwealth Avenue, Chestnut Hill, MA 02467, United States
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Abstract

original image

An embedded nanosphere dielectric structure on an a-Si ultrathin film improves weighted absorption from 23.8% to 39.9%. The PMMA embedding layer offers a guided wave mode as well as mechanical robustness, in addition to the resonant whispering gallery modes coupling. Broadband light-trapping enhancements are observed by dielectric surface textured structures of hemispheres, nanocones, nanospheres, or embedded nanospheres.

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