中国物理B ›› 2008, Vol. 17 ›› Issue (7): 2707-2711.doi: 10.1088/1674-1056/17/7/058

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Rectifying effect of heterojunctions between metals and doped conducting polymer nanostructure pellets

惠雯1, 龙云泽2, 尹志华2, 万梅香3, 陈兆甲4   

  1. (1)Beijing University of Technology, Beijing 100022, China; (2)College of Physics Science, Qingdao University, Qingdao 266071, China; (3)Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China; (4)Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2007-12-19 修回日期:2008-01-20 出版日期:2008-07-09 发布日期:2008-07-09
  • 基金资助:
    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).

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)   

  1. a College of Physics Science, Qingdao University, Qingdao 266071, China; b Beijing University of Technology, Beijing 100022, China; c Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; d Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2007-12-19 Revised:2008-01-20 Online:2008-07-09 Published:2008-07-09
  • Supported by:
    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).

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摘要： 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.

关键词: Schottky junctions, rectifying effect, conducting polymer nanostructures

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.

Key words: Schottky junctions, rectifying effect, conducting polymer nanostructures

中图分类号:  (Rectification)

  • 73.40.Ei
73.30.+y (Surface double layers, Schottky barriers, and work functions) 73.40.Ns (Metal-nonmetal contacts) 73.40.Sx (Metal-semiconductor-metal structures) 85.30.Kk (Junction diodes)