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Ko, Hyunhyub
Functional Nanomaterials & Devices Lab
Research Interests
  • Functional nanomaterials, flexible electronics, electronic skins, wearable sensors

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Broadband omnidirectional light detection in flexible and hierarchical ZnO/Si heterojunction photodiodes

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Title
Broadband omnidirectional light detection in flexible and hierarchical ZnO/Si heterojunction photodiodes
Author
Lim, SeongdongUm, Doo-SeungHa, MinjeongZhang, QianpengLee, YoungsuLin, YuanjingFan, ZhiyongKo, Hyunhyub
Keywords
flexible photodetector; photodiode; omnidirectional; hierarchical; zinc oxide nanowire
Issue Date
201701
Publisher
TSINGHUA UNIV PRESS
Citation
NANO RESEARCH, v.10, no.1, pp.22 - 36
Abstract
The development of flexible photodetectors has received great attention for future optoelectronic applications including flexible image sensors, biomedical imaging, and smart, wearable systems. Previously, omnidirectional photodetectors were only achievable by integration of a hemispherical microlens assembly on multiple photodetectors. Herein, a hierarchical photodiode design of ZnO nanowires (NWs) on honeycomb-structured Si (H-Si) membranes is demonstrated to exhibit excellent omnidirectional light-absorption ability and thus maintain high photocurrents over broad spectral ranges (365 to 1,100 nm) for wide incident angles (0° to 70°), which enabled broadband omnidirectional light detection in flexible photodetectors. Furthermore, the stress-relieving honeycomb pattern within the photodiode micromembranes provided photodetectors with excellent mechanical flexibility (10% decrease in photocurrent at a bending radius of 3 mm) and durability (minimal change in photocurrent over 10,000 bending cycles). When employed in semiconductor thin films, the hierarchical NW/honeycomb heterostructure design acts as an efficient platform for various optoelectronic devices requiring mechanical flexibility and broadband omnidirectional light detection.[Figure not available: see fulltext.] © 2016 Tsinghua University Press and Springer-Verlag Berlin Heidelber
URI
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DOI
http://dx.doi.org/10.1007/s12274-016-1263-y
ISSN
1998-0124
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