| 학회 |
한국재료학회 |
| 학술대회 |
2016년 봄 (05/18 ~ 05/20, 여수 디오션리조트 ) |
| 권호 |
22권 1호 |
| 발표분야 |
F. 광기능/디스플레이 재료 분과 |
| 제목 |
Omnidirectional and Flexible Photodetector Based on Hierarchical ZnO Nanowires on Honeycomb-Structured Si Membranes |
| 초록 |
Flexible photodetectors are important for future optoelectronics applications such as flexible image sensors, artificial retina, biomedical imaging, and smart wearable systems. One of the critical limitations of previous flexible photodetectors is the absence of omnidirectional light-detection capability, which would allow a wide field of view and thus precise monitoring of a moving object of light. Here, we suggest omnidirectional and flexible photodetectors based on hierarchical ZnO nanowires (NWs) on honeycomb-structured Si (H-Si) membranes. UV-Vis-NIR reflectance analysis with variable angles confirmed that the hierarchical ZnO NW/H-Si structures exhibited excellent omnidirectional light-absorption ability with greatly diminished reflectance over the entire range of light from UV to NIR. In addition, photodetectors based on hierarchical ZnO NWs/H-Si membranes maintained high photocurrents when the angle of incident light changed from 0 to 70°, which can be favorably compared to photodetectors based on ZnO films on flat Si (F-Si) membranes. Furthermore, the unique honeycomb structures in the flexible photodetectors provided high mechanical flexibility (a 10% decrease in photocurrent at a bending radius of 3 mm) and durability (minimal change in photocurrent over 10,000 bending cycles). The proposed hierarchical design of nanowire arrays on honeycomb-structured semiconductor membranes can be used in a valuable platform for various optoelectronic devices requiring enhanced light-absorption properties and mechanical flexibility. |
| 저자 |
Seongdong Lim1, Doo-Seung Um1, Minjeong Ha1, Qianpeng Zhang2, Youngsu Lee1, Yuanjing Lin2, Zhiyong Fan2, Hyunhyub Ko1
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| 소속 |
1UNIST, 2HKUST |
| 키워드 |
Flexible photodetector; photodiode; omnidirectional; hierarchical; zinc oxide nanowire
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| E-Mail |
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