Nonlinear impedance spectroscopy of organic MIS capacitors and planar heterojunction diodes
Nonlinear impedance spectroscopy of organic MIS capacitors and planar heterojunction diodes
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有机 MIS 电容器和平面异质结二极管的非线性阻抗谱
DOI：
10.1016/j.orgel.2018.07.003
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发表时间：
2018
影响因子：
3.2
通讯作者：
White, Matthew S.
中科院分区：
文献类型：
--
作者：
Larsen, Andrew;Dahal, Ekraj;Paluba, Justin;Cianciulli, Karen;Isenhart, Benjamin;Arnold, Michael;Du, Bin;Jiang, Yu;White, Matthew S.
我们提出了一种非线性阻抗谱技术，并展示了其直接测量非线性过程的能力，包括有机半导体二极管和 MIS 电容器中的电子空穴复合和空间电荷效应。该方法基于所测量的高次谐波电流对交流电压信号的响应的傅立叶分析。高次谐波响应的表征允许非线性阻抗谱在较宽的频率范围内测量材料和器件的特性，否则使用传统阻抗谱是不可能实现的。由于高次谐波信号纯粹是非线性过程的产物，因此它们与线性器件电容和电阻无关。这使得可以在几个数量级的更高频率下研究空间电荷和复合效应，而无需拟合等效电路模型。
We present a nonlinear impedance spectroscopy technique and demonstrate its ability to directly measure nonlinear processes including electron-hole recombination and space charge effects in organic-semiconductor-based diodes and MIS capacitors. The method is based on Fourier analysis of the measured higher harmonic current response to an AC voltage signal. Characterization of the higher harmonic response allows nonlinear impedance spectroscopy to measure material and device properties over a wide range of frequencies, which would otherwise be impossible using conventional impedance spectroscopy. As the higher harmonic signals are purely a product of nonlinear processes, they are independent of the linear device capacitance and resistance. This allows space charge and recombination effects to be investigated at several orders of magnitude higher frequency without fitting to an equivalent circuit model.