Comparative Study of Active-Over-Metal and Metal-Over-Active Amorphous IGZO Thin-Film Transistors With Low-Frequency Noise Measurements
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Abstract
Bottom-gate metal-over-active (MOA) and active-over-metal (AOM) amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistors (TFTs), with channel lengths varying from 1 to 16 μm, are investigated with low-frequency noise (LFN) measurements in the linear region of operation. In the low drain-current range, LFN originates from carrier number fluctuations, whereas in the high drain-current range, the noise is affected by the series resistance. The extracted gate-insulator trap densities near the interface lead to the conclusion that the AOM a-IGZO TFTs are superior compared to the MOA devices.
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<author><name sortKey="Tsormpatzoglou, Andreas" uniqKey="Tsormpatzoglou A">Andreas Tsormpatzoglou</name>
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<author><name sortKey="Hastas, Nikolaos A" uniqKey="Hastas N">Nikolaos A. Hastas</name>
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<author><name sortKey="Dimitriadis, Charalabos A" uniqKey="Dimitriadis C">Charalabos A. Dimitriadis</name>
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<term>Gallium oxide</term>
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<front><div type="abstract" xml:lang="en">Bottom-gate metal-over-active (MOA) and active-over-metal (AOM) amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistors (TFTs), with channel lengths varying from 1 to 16 μm, are investigated with low-frequency noise (LFN) measurements in the linear region of operation. In the low drain-current range, LFN originates from carrier number fluctuations, whereas in the high drain-current range, the noise is affected by the series resistance. The extracted gate-insulator trap densities near the interface lead to the conclusion that the AOM a-IGZO TFTs are superior compared to the MOA devices.</div>
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