提出了一种可以精确获得有机薄膜晶体管(OTFT)的直流电流-电压模型中的参数提取方法.该方法通过对实验获得的输出特性曲线和转移特性曲线进行计算和处理,精确获得OTFT器件模型中的7个参数.实验制备了两种采用不同绝缘栅的基于并五苯的底栅顶接触的OTFT,并对其进行了参数提取.利用提取的参数及直流电流-电压模型对OTFT进行模拟,将模拟结果与实验测试结果相比较发现,模拟得到的输出特性及转移特性与测试结果拟合得很好,验证了本文中参数提取方法的正确性.应用建立的模型及本文中的参数提取方法可以用于OTFT器件的设计与模拟.
A new procedure is proposed to extract the basic parameters for the accurate spice-like direct current(DC)current-voltage mode for OTFTs,which provides a much rigorous and accurate determination of main electrical parameters of organic TFTs.All the main electrical parameters are extracted in a simple and direct way from the experimental measurements,including the output characteristics cure and the transfer characteristics cure,with no need of assigning predetermined values to any other model parameter or using optimization methods.Two types of top source and drain contact(TC)pentacene TFTs using different gate dielectrics are researched on and parameters are extracted from experimental data.With these parameters extracted and the model,simulation results based on SPICE are obtained,which show a very good agreement with measured curves in both transfer and output characteristics,then the accuracy of the extracted parameters method is verified.The unified model and the parameter extraction method should present a high level of accuracy in OTFTs' design and simulations.
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