Toward High‐Output Organic Vertical Field Effect Transistors: Key Design Parameters |
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Authors: | Hyukyun Kwon Mincheol Kim Hanul Moon Jongjin Lee Seunghyup Yoo |
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Affiliation: | 1. School of Electrical Engineering, KAIST, Daejeon, Republic of Korea;2. Department of Physics and Research Institute for Green Energy, Convergence Technology (RIGET), Gyeongsang National University, Jinju, Republic of Korea |
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Abstract: | The performance of C60‐based organic vertical field‐effect transistors (VFETs) is investigated as a function of key geometrical parameters to attain a better understanding of their operation mechanism and eventually to enhance their output current for maximal driving capability. To this end, a 2D device simulation is performed and compared with experimental results. The results reveal that the output current scales mostly with the width of its drain electrode, which is in essence equivalent to the channel width in conventional lateral‐channel transistors, but that of the source electrode and the thickness of C60 layers underneath the source electrode also play subtle but important roles mainly due to the source contact‐limited behavior of the organic VFETs under study. With design strategies acquired from this study, a VFET with an on/off ratio of 5.5 × 105 and on‐current corresponding to a channel length of near 1 μm in a conventional lateral‐channel organic field‐effect transistor (FET) is demonstrated, while the drain width of the VFET and the channel width of the lateral‐channel organic FET are the same. |
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Keywords: | C60 device simulation organic electronics organic field‐effect transistors vertical field‐effect transistors |
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