Rectifying effect of heterojunctions between metals and doped conducting polymer nanostructure pellets
Long Yun-Ze(龙云泽)a)†, Yin Zhi-Hua(尹志华)a), Hui Wen(惠雯)b), Chen Zhao-Jia(陈兆甲)c), and Wan Mei-Xiang(万梅香)d)
aCollege of Physics Science, Qingdao University, Qingdao 266071, China; bBeijing University of Technology, Beijing 100022, China; cInstitute of Physics, Chinese Academy of Sciences, Beijing 100190, China; dInstitute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
Abstract This paper reports that the Schottky junctions between low work function metals (e.g. Al and In) and doped semiconducting polymer pellets (e.g. polyaniline (PANI) microsphere pellet and polypyrrole (PPy) nanotube pellet) have been prepared and studied. Since Ag is a high work function metal which can make an ohmic contact with polymer, silver paste was used to fabricate the electrodes. The Al/PANI/Ag heterojunction shows an obvious rectifying effect as shown in $I-V$ characteristic curves (rectifying ratio $\gamma = 5$ at $\pm $6 V bias at room temperature). As compared to the Al/PANI/Ag, the heterojunction between In and PANI (In/PANI/Ag) exhibits a lower rectifying ratio $\gamma = 1.6$ at $\pm $2 V bias at room temperature. In addition, rectifying effect was also observed in the heterojunctions Al/PPy/Ag ($\gamma = 3.2$ at $\pm $1.6 V bias) and In/PPy/Ag ($\gamma = 1.2$ at $\pm $3.0 V bias). The results were discussed in terms of thermoionic emission theory.
Received: 19 December 2007
Revised: 20 January 2008
Accepted manuscript online:
Fund: Project supported by
the National Natural Science Foundation of China (Grant No 10604038)
and Program for New Century Excellent Talents in University of China
(Grant No NCET2007).
Cite this article:
Long Yun-Ze(龙云泽), Yin Zhi-Hua(尹志华), Hui Wen(惠雯), Chen Zhao-Jia(陈兆甲), and Wan Mei-Xiang(万梅香) Rectifying effect of heterojunctions between metals and doped conducting polymer nanostructure pellets 2008 Chin. Phys. B 17 2707
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