期刊
ELECTRONICS
卷 12, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/electronics12030540
关键词
organic field-effect transistor; threshold voltage shift; charge trapping; pre-applied voltage
Field-effect transistors based on organic semiconducting materials (OFETs) have advantages such as mechanical flexibility, low manufacturing cost, and improved device parameters. However, a significant problem in OFETs is the shift in threshold voltage (V-TH). This study demonstrates that the V-TH of polymer OFETs with SiO2 dielectric is noticeably shifted by applying a large gate voltage, indicating the presence of charge trappings in the SiO2 bulk. The generality of this observation is further confirmed with other conjugated polymers.
Field-effect transistors based on organic semiconducting materials (OFETs) have unique advantages of intrinsically mechanical flexibility, simple preparation process, low manufacturing cost, and large-area preparation. Through the innovation of new material design and device structures, the performance of device parameters such as mobility, on-off current ratio, and the threshold voltage (V-TH) of OFETs continues to improve. However, the V-TH shift of OFETs has always been an important problem restricting their practical applications. In this work, we observe that the V-TH of polymer OFETs with the widely investigated device structure of a SiO2 bottom-gate dielectric is noticeably shifted by pre-applying a large gate voltage. Such a shift in V-TH remains to a large extent, even after modifying the surface of the SiO2 dielectric using a hexamethyldisilazane (HMDS) self-assembled monolayer. This behavior of V-TH can be ascribed to the charge trappings at the bulk of the SiO2. In addition, the generality of this observation is further proven by using two other conjugated polymers including p-type PDPP3T and n-type PTzNDI-2FT, and a similar trend is obtained.
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