中国物理B ›› 2008, Vol. 17 ›› Issue (6): 2251-2256.doi: 10.1088/1674-1056/17/6/052

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Anisotropic electrical conductivity,phase transition and thermal hysteresis of a charge-transfer salt dibutylammonium bis-7,7,8,8-tetracyanoquinodimethane DBA(TCNQ)2

陈兆甲1, 彭海琳2, 刘忠范2, 龙云泽3   

  1. (1)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; (2)Center for Nanoscale Science and Technology, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China; (3)College of Physics Science, Qingdao University, Qingdao 266071, China
  • 收稿日期:2007-10-29 修回日期:2007-11-29 出版日期:2008-06-20 发布日期:2008-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10604038) and the Program for New Century Excellent Talents in University (NCET-2007).

Anisotropic electrical conductivity,phase transition and thermal hysteresis of a charge-transfer salt dibutylammonium bis-7,7,8,8-tetracyanoquinodimethane DBA(TCNQ)2

Long Yun-Ze(龙云泽)a)†, Chen Zhao-Jia(陈兆甲)b), Peng Hai-Lin(彭海琳)c), and Liu Zhong-Fan(刘忠范)c)   

  1. a College of Physics Science, Qingdao University, Qingdao 266071, China; b Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; c Center for Nanoscale Science and Technology, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
  • Received:2007-10-29 Revised:2007-11-29 Online:2008-06-20 Published:2008-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10604038) and the Program for New Century Excellent Talents in University (NCET-2007).

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摘要： This paper reports that a charge-transfer salt dibutylammonium bis-7,7,8,8-tetracyanoquinodimethane [DBA (TCNQ)2] has been prepared. The temperature dependences of the DC electrical conductivity of the DBA (TCNQ)2 single crystal measured along the crystallographic a, b, and c axes are reported. The crystal shows semiconducting behaviour and the room-temperature conductivities are highly anisotropic (\sigmaa = 3.63\times 10-4S/cm, \sigmab= 2.84$\times 10-6S/cm, and \sigmac = 1.82\times 10-5S/cm). Particularly, a sharp semiconductor to semiconductor transition has been observed around 270 K on the resistivity curves measured under cooling and heating. In addition, thermal hysteresis phenomena on conductivity and differential scanning calorimetry curves are also reported.

关键词: organic crystals, charge-transfer salt, conductivity, anisotropy

Abstract: This paper reports that a charge-transfer salt dibutylammonium bis-7,7,8,8-tetracyanoquinodimethane [DBA (TCNQ)2] has been prepared. The temperature dependences of the DC electrical conductivity of the DBA (TCNQ)2 single crystal measured along the crystallographic a, b, and c axes are reported. The crystal shows semiconducting behaviour and the room-temperature conductivities are highly anisotropic  ($\sigma_{a}=3.63\times10^{-4}$ S/cm, $\sigma_{b}=2.84\times10^{-6}$S/cm, and $\sigma_{c}=1.82\times10^{-5}$S/cm). Particularly, a sharp semiconductor to semiconductor transition has been observed around 270 K on the resistivity curves measured under cooling and heating. In addition, thermal hysteresis phenomena on conductivity and differential scanning calorimetry curves are also reported.

Key words: organic crystals, charge-transfer salt, conductivity, anisotropy

中图分类号:  (Charge carriers: generation, recombination, lifetime, and trapping)

  • 72.20.Jv
66.70.-f (Nonelectronic thermal conduction and heat-pulse propagation in solids;thermal waves) 72.80.Le (Polymers; organic compounds (including organic semiconductors)) 81.70.Pg (Thermal analysis, differential thermal analysis (DTA), differential thermogravimetric analysis)