Date
Place
- Room H (Room Hall 1, 1F)
- P2. Poster Session II
- August 21, 2015 (Friday)
- 14:00 ~ 15:30
- [P2-50]
- 14:00 ~ 15:30
- Title:Hierarchical ZnO Nanowire Arrays on Si Honeycomb Structures for Flexible and Omnidirectional Photodetectors
- Seongdong Lim, Minjeong Ha, Doo-Seung Um, Youngsu Lee, and Hyunhyub Ko (UNIST, Korea)
Abstract: The development of photon management techniques is a key issue for high performance of optoelectronics including photodetectors, light-emitting diodes, and solar cells. In order to effectively collect omnidirectional light, low-refractive index antireflection coating or antireflective nanostructures such as nanodome and inverted nanocone are introduced onto the surface of optoelectronics. Beside, hierarchically designed micro/nanostructures can enhance the light absorption efficiency via efficient light absorption and management behavior. In this study, we develop a flexible and omnidirectional UV/Visible photodetector which has a broad absorption spectral range of 380 to 1100 nm based on hierarchical heterostructures of n-type ZnO nanowires on honeycomb-structured p-type silicon membranes with polyimide substrate. The omnidirectional light absorption of hierarchical nanowire/honeycomb structure is demonstrated by angle-dependent photocurrent variation. Furthermore, the tendency of photocurrent variation is in good agreement with the result of UV-Vis-NIR analysis with variable angle specular reflectance accessory (VASRA). In summary, we suggest hierarchically designed nanowire on honeycomb structures as a new approach for omnidirectional light absorption in flexible optoelectronic system. We anticipate that our unique structure can be utilized to future energy-harvesting system and high-performance flexible electronic industry.
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