Thickness dependence of surface morphology and charge carrier mobility in organic field-effect transistors |
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Authors: | Tian Xue-Yan Xu Zheng Zhao Su-Ling Zhang Fu-Jun Yuan Guang-Cai Li Jing Sun Qin-Jun Wang Yun and Xu Xu-Rong |
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Institution: | Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China;Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education, Beijing 100044, China |
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Abstract: | With the aim of understanding the relationships between
organic small molecule field-effect transistors (FETs) and organic
conjugated polymer FETs, we investigate the thickness dependence of
surface morphology and charge carrier mobility in pentacene and
regioregular poly (3-hexylthiophene) (RR-P3HT) field-effect
transistors. On the basis of the results of surface morphologies and
electrical properties, we presume that the charge carrier mobility
is largely related to the morphology of the organic active layer. We
observe that the change trends of the surface morphologies (average
size and average roughness) of pentacene and RR-P3HT thin films are
mutually opposite, as the thickness of the organic layer increases.
Further, we demonstrate that the change trends of the field-effect
mobilities of pentacene and RR-P3HT FETs are also opposite to each
other, as the thickness of the organic layer increases within its
limit. |
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Keywords: | organic field-effect transistors morphology thickness dependence field-effect mobility |
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