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High hole and electron mobilities in nanocrystalline silicon thin-film transistors

机译:纳米晶硅薄膜晶体管中的高空穴和电子迁移率

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摘要

We report for the first time high hole and electron mobilities in directly deposited plasma-enhanced chemical vapor deposition (PECVD) hydrogenated nanocrystalline silicon (nc-Si:H) thin-film transistors (TFTs) fabricated at 260 degrees C. This is made possible simply using Cr drain-source Schottky contacts with high-purity and high-crystallinity nc-Si:H channel layer, which creates highly conductive Cr silicided contacts, reducing both hole and electron injection barriers. The p-channel nc-Si:H TFTs show a field-effect hole mobility (mu(hFE)) of 25 cm(2) V-1 s(-1), a threshold voltage (V-T) of -3.8 V, a subthreshold slope (S) of 0.25 V/dec, and an ON/OFF current ratio of more than 106, while the n-channel nc-Si:H TFTs show a field-effect electron mobility (mu(eFE)) of 150 cm(2) V-1 s(-1), a V-T of 2 V, a S of 0.3 V/dec, and an ON/OFF current of more than 10(7). The TFT performance reported here offers promise for low-temperature complementary metal oxide semiconductor (CMOS) circuit integration. (c) 2006 Elsevier B.V. All rights reserved.
机译:我们首次报告了在260摄氏度下制造的直接沉积的等离子体增强化学气相沉积(PECVD)氢化纳米晶硅(nc-Si:H)薄膜晶体管(TFT)中的高空穴和电子迁移率。只需使用具有高纯度和高结晶度nc-Si:H沟道层的Cr漏源肖特基接触,即可形成高导电性的Cr硅化接触,从而减少空穴和电子注入势垒。 p沟道nc-Si:H TFT显示的场效应空穴迁移率(mu(hFE))为25 cm(2)V-1 s(-1),阈值电压(VT)为-3.8 V,a亚阈值斜率(S)为0.25 V / dec,开/关电流比大于106,而n沟道nc-Si:H TFT的场效应电子迁移率(mu(eFE))为150 cm (2)V-1 s(-1),VT为2 V,S为0.3 V / dec,开/关电流大于10(7)。此处报道的TFT性能为低温互补金属氧化物半导体(CMOS)电路集成提供了希望。 (c)2006 Elsevier B.V.保留所有权利。

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