Broadband omnidirectional light detection in flexible and hierarchical ZnO/Si heterojunction photodiodes
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- 作者：Seongdong Lim ; Doo-Seung Um ; Minjeong Ha ; Qianpeng Zhang ; Youngsu Lee…
- 关键词：flexible photodetector ; photodiode ; omnidirectional ; hierarchical ; zinc oxide nanowire
- 刊名：Nano Research
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：10
- 期：1
- 页码：22-36
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Nanotechnology; Materials Science, general; Atomic/Molecular Structure and Spectra; Condensed Matter Physics; Biotechnology; Biomedicine, general;
- 出版者：Tsinghua University Press
- ISSN：1998-0000
- 卷排序：10
文摘
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.