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MOSFET-Like Behavior of a-InGaZnO Thin-Film Transistors With Plasma-Exposed Source–Drain Bulk Region

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5 Author(s)
Jaewook Jeong ; Dept. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., Seoul, South Korea ; Yongtaek Hong ; Jae Kyeong Jeong ; Jin-Seong Park
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In this paper, we analyzed electrical characteristics of amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistor (TFT) with plasma-exposed source-drain (S/D) bulk region. The parasitic resistance and effective channel length characteristics exhibit similar behavior with that of crystalline silicon metal oxide-semiconductor field effect transistor (c-Si MOSFET) that has doped S/D bulk region. The transfer curves little changed with gate overlap variation, and the width-normalized parasitic resistance obtained from transmission line method was as low as 3 to 6 Omegamiddotcm. The effective channel length was shorter than the mask channel length and showed gate-to-source (VGS) voltage dependency that is frequently observed for lightly doped drain (LDD) MOSFET. Experimental and simulation results showed that the plasma exposure caused an LDD-like doping effect in the S/D bulk region by inducing oxygen vacancy in the a-IGZO layer.

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Journal of Display Technology  (Volume:5 ,  Issue: 12 )