期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 29, 页码 19024-19030出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b04231
关键词
single carbon nanotube; Y-junction; photoresponse; zero-bias photocurrent; low-temperature electrical transport; Schottky barrier
资金
- Nanomission, Department of Science and Technology, Govt. of India
- Theme Unit of Excellence in Nanodevice Technology
- J.C. Bose Fellowship
- American Physical Society
- Indo-US Science and Technology Forum (IUSSTF) through India-US Physics Visitation Program
We report investigation of optical response in a single strand of a branched carbon nanotube (CNT), a Y-junction CNT composed of multiwalled CNTs. The experiment was performed by connecting a pair of branches while grounding the remaining one. Of the three branch combinations, only one combination is optically active which also shows a nonlinear semiconductor-like I V curve, while the other two branch combinations are optically inactive and show linear ohmic I V curves. The photoresponse includes a zero-bias photocurrent from the active branch combination. Responsivity of approximate to 1.6 mA/W has been observed from a single Y-CNT at a moderate bias of 150 mV with an illumination of wavelength 488 nm. The photoresponse experiment allows us to understand the nature of internal connections in the Y-CNT. Analysis of data locates the region of photoactivity at the junction of only two branches and only the combination of these two branches (and not individual branches) exhibits photoresponse upon illumination. A model calculation based on back-to-back Schottky-type junctions at the branch connection explains the I-V data in the dark and shows that under illumination the barriers at the contacts become lowered due to the presence of photogenerated carriers.
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