Space-charge limited conduction in doped polypyrrole devices

被引:48
|
作者
Anjaneyulu, P. [1 ]
Sangeeth, C. S. Suchand [1 ]
Menon, Reghu [1 ]
机构
[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India
关键词
TEMPERATURE-DEPENDENCE; POLYMER; INJECTION; ELECTRON; MOBILITY; FIELD;
D O I
10.1063/1.3373393
中图分类号
O59 [应用物理学];
学科分类号
摘要
Doping dependent current-voltage (I-V) and capacitance-voltage (C-V) measurements were carried out on polypyrrole devices in metal-polymer-metal sandwich structure. Temperature dependent I-V measurements infer that space-charge limited conduction (SCLC) with exponential trap distribution is appropriate for the moderately doped samples, whereas trap-free SCLC is observed in lightly doped samples. Trap densities and energies are estimated, the effective mobility is calculated using the Poole-Frenkel model, and the mobility exhibits thermally activated behavior. Frequency dependent capacitance-voltage characteristics show a peak near zero bias voltage, which implies that these devices are symmetric with a negligible barrier height at the metal-polymer interface. Low frequency capacitance measurements have revealed a negative capacitance at higher voltages due to the processes associated with the injection and redistribution of space-charges. (C) 2010 American Institute of Physics. [doi:10.1063/1.3373393]
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页数:6
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