Broadband Light‐Trapping Enhancement in an Ultrathin Film a‐Si Absorber Using Whispering Gallery Modes and Guided Wave Modes with Dielectric Surface‐Textured Structures
- 26 March 2013
- journal article
- research article
- Published by Wiley in Advanced Materials
- Vol. 25 (18) , 2617-2623
Abstract
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.Keywords
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