Comparative study of field-effect mobility with different expressions in organic thin film transistors |
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| Authors: | Wenbin Guo Liang Shen Dongge Ma |
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| Institution: | aState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China;bCollege of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China |
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| Abstract: | In organic thin film transistors (OTFTs), mobility generally exhibits field-effect dependence, and is strongly related to the disorder property of organic semiconductors used in OTFTs. Here, we compared three typical field-effect mobility models and used them to simulate the output characteristics of pentacene-based OTFTs. From the comparison of the theory and experiment, an analytic expression for the field-effect mobility to exactly describe the electrical characteristics of OTFTs was obtained. The better fit to the output characteristics of poly(9,9-dioctyl-fluorene-co-N-(4-butylphenyl)-diphenylamine) (TFB)-based OTFT and copper phthalocyanine (CuPc)-based OTFT by using the obtained analytic expression of the field-effect mobility further extended its applicability in OTFTs. This supplies a valuable manner to derive the field-effect mobility of carriers and understand the transport characteristics of carriers in OTFTs. |
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| Keywords: | Field-effect mobility Organic thin film transistor Modeling |
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