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首页> 外文期刊>IEE Proceedings. Part A >Conduction in partially monoclinic films of lead phthalocyanine
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Conduction in partially monoclinic films of lead phthalocyanine

机译:铅酞菁的部分单斜膜中的导电

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The X-ray diffraction pattern of vacuum sublimed thin films of lead phthalocyanine on glass substrates shows a partially monoclinic structure. The DC conduction is extrinsic since the activation energy is much smaller than the energy bandgap. AC conductivity σ_ac follows a power law dependence on frequency (f) for T ≤ 230K and 20Hz ≤ f ≤ 320kHz range, and this behaviour is believed to be due to correlated hopping of charge carriers over a reduced intercluster potential barrier of 0.49eV and a minimum distance of 6.7nm. Above 230K, the dielectric polarisation occurs due to structural inhomogeneities with a distribution of relaxation times. The conduction becomes independent of temperature at 1 MHz.
机译:真空升华的酞菁铅在玻璃基板上的薄膜的X射线衍射图显示出部分单斜晶结构。直流传导是非本征的,因为活化能远小于能带隙。对于T≤230K和20Hz≤f≤320kHz范围,AC电导率σ_ac遵循幂定律对频率(f)的依赖,并且此行为被认为是由于电荷载流子在0.49eV的减小的簇间势垒和a上的相关跳跃引起的。最小距离为6.7nm。在230K以上,由于结构不均匀以及弛豫时间的分布,会发生介电极化。传导变得独立于1 MHz的温度。

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