Resonance-Enhanced Absorption in Hollow Nanoshell Spheres with Omnidirectional Detection and High Responsivity and Speed

Der-Hsien Lien, Zhenghong Dong, Jose Ramon Duran Retamal, Hsin-Ping Wang, Tzu-Chiao Wei, Dan Wang, Jr-Hau He, Yi Cui

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Optical resonance formed inside a nanocavity resonator can trap light within the active region and hence enhance light absorption, effectively boosting device or material performance in applications of solar cells, photodetectors (PDs), and photocatalysts. Complementing conventional circular and spherical structures, a new type of multishelled spherical resonant strategy is presented. Due to the resonance-enhanced absorption by multiple convex shells, ZnO nanoshell PDs show improved optoelectronic performance and omnidirectional detection of light at different incidence angles and polarization. In addition, the response and recovery speeds of these devices are improved (0.8 and 0.7 ms, respectively) up to three orders of magnitude faster than in previous reports because of the existence of junction barriers between the nanoshells. The general design principles behind these hollow ZnO nanoshells pave a new way to improve the performance of sophisticated nanophotonic devices.
Original languageEnglish (US)
Pages (from-to)1801972
JournalAdvanced Materials
Volume30
Issue number34
DOIs
StatePublished - Jul 18 2018

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