Chen P.-Y.Hsiao H.-H.Ho C.-I.Ho C.-C.Lee W.-L.Chang H.-C.Lee S.-C.Chen J.-Z.JIAN-ZHANG CHENSI-CHEN LEEI-CHUN CHENGHUI-HSIN HSIAO2019-09-262019-09-26201410944087https://scholars.lib.ntu.edu.tw/handle/123456789/425316Large and periodic anti-ring arrays are fabricated by using a monolayer of polymer/nanosphere hybrid technique and applied as back reflectors in substrate-type hydrogenated amorphous silicon (a-Si:H) thinfilm solar cells. The structure of each anti-ring comprises a nanodome centered inside a nanohole. The excitation of Bloch wave surface plasmon polaritons is observed in the Ag-coated anti-ring arrays. The nanodomes of the anti-ring arrays turn out to enhance large-angle light scattering and increase the effective optical path in the solar cell. The resulting efficiency of an ultrathin a-Si:H (thickness: 150 nm) solar cell is enhanced by 39% compared to that with a flat back reflector and by 13% compared to that with a nanohole back reflector. ? 2014 Optical Society of America.journal article10.1364/OE.22.0A11282-s2.0-84903711672WOS:000338055900011https://www2.scopus.com/inward/record.uri?eid=2-s2.0-84903711672&doi=10.1364%2fOE.22.0A1128&partnerID=40&md5=27b5cb285886ac6454cb4f29656dc7f1