VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Tuesday 6
Poster Session

› 21:00 - 23:00 (2h)
SWCNTs - WO3 heterojunction contact as adetector for UV photocurent responses
Vuong Nguyen  1@  , Hieu Hoang  1@  , Dojin Kim  1@  
1 : ChungnamNationalUniversity, 220 Gung-dong, Yuseong-gu, Daejeon, Republic of Korea
ChungnamNationalUniversity, 220 Gung-dong, Yuseong-gu, Daejeon, Republic of Korea -  South Korea

We report an ultra violet (UV) photodetector based on nanostructure of single wall carbon nanotubes (SWCNTs) - WO3 heterojunction contact showing fast responses. WO3 thin film and SWCNTs were fabricated by DC sputtering system following heat treatment and arc - discharge method, respectively. The characterization of the WO3 thin film and SWCNTs was examined by scanning electron microscopy, X- ray diffraction and Raman spectroscopy. The Metal (Pt) - Semiconductor (WO3 or SWCNTs) - Metal (Pt) structure was also fabricated to investigate UV photocurrent response characterization for comparison purpose. It was found that the rectification behavior between SWCNTs and WO3 played a central role for the rectifying I-V characteristics and UV response performance improvement. The mechanism of the UV photocurrent was also proposed and discussed using energy band diagram.

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