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    • 6. 发明授权
    • Thin film transistor and display device having the thin film transistor
    • 薄膜晶体管和具有薄膜晶体管的显示装置
    • US08253138B2
    • 2012-08-28
    • US12263702
    • 2008-11-03
    • Shunpei YamazakiSatoshi KobayashiYoshiyuki KurokawaHiromichi Godo
    • Shunpei YamazakiSatoshi KobayashiYoshiyuki KurokawaHiromichi Godo
    • H01L29/04
    • H01L29/04H01L21/02532H01L21/0262H01L29/41733H01L29/66765H01L29/78696
    • A thin film transistor includes a gate electrode, a gate insulating layer covering the gate electrode, a microcrystalline semiconductor layer over the gate insulating layer, an amorphous semiconductor layer over the microcrystalline semiconductor layer, source and drain regions over the amorphous semiconductor layer, source and drain electrodes in contact with and over the source and drain regions, and a part of the amorphous semiconductor layer overlapping with the source and drain regions is thicker than a part of the amorphous semiconductor layer overlapping with a channel formation region. The side face of the source and drain regions and the side face of the amorphous semiconductor form a tapered shape together with an outmost surface of the amorphous semiconductor layer. The taper angle of the tapered shape is such an angle that decrease electric field concentration around a junction portion between the source and drain regions and the amorphous semiconductor layer.
    • 薄膜晶体管包括栅电极,覆盖栅电极的栅极绝缘层,栅极绝缘层上的微晶半导体层,微晶半导体层上的非晶半导体层,非晶半导体层上的源极和漏极区,源极和 与源极和漏极区域接触和超过的漏极电极,与源极和漏极区域重叠的部分非晶半导体层比与沟道形成区域重叠的非晶半导体层的一部分更厚。 源极和漏极区域的侧面和非晶半导体的侧面与非晶半导体层的最外表面一起形成锥形形状。 锥形形状的锥角是减小源极和漏极区域与非晶半导体层之间的接合部周围的电场浓度的角度。
    • 9. 发明申请
    • SEMICONDUCTOR DEVICE
    • 半导体器件
    • US20110127525A1
    • 2011-06-02
    • US12954222
    • 2010-11-24
    • Shunpei YamazakiHiromichi GodoDaisuke Kawae
    • Shunpei YamazakiHiromichi GodoDaisuke Kawae
    • H01L29/786
    • H01L29/78693H01L29/41733H01L29/42384H01L29/4908H01L29/66969H01L29/7869H01L29/78696
    • An intrinsic or substantially intrinsic semiconductor, which has been subjected to a step of dehydration or dehydrogenation and a step of adding oxygen so that the carrier concentration is less than 1×1012/cm3 is used for an oxide semiconductor layer of an insulated gate transistor, in which a channel region is formed. The length of the channel formed in the oxide semiconductor layer is set to 0.2 μm to 3.0 μm an inclusive and the thicknesses of the oxide semiconductor layer and the gate insulating layer are set to 15 nm to 30 nm inclusive and 20 nm to 50 nm inclusive, respectively, or 15 nm to 100 nm inclusive and 10 nm to 20 nm inclusive, respectively. Consequently, a short-channel effect can be suppressed, and the amount of change in threshold voltage can be less than 0.5 V in the range of the above channel lengths.
    • 对于绝缘栅极晶体管的氧化物半导体层,使用已进行脱水或脱氢工序的本征或本质上本征的半导体,以及添加氧以使载流子浓度小于1×10 12 / cm 3的步骤, 其中形成沟道区。 将形成在氧化物半导体层中的沟道的长度设定为0.2μm〜3.0μm,氧化物半导体层和栅极绝缘层的厚度为15nm〜30nm,包括20nm〜50nm ,或分别为15nm〜100nm,10nm〜20nm。 因此,可以抑制短沟道效应,并且在上述通道长度的范围内阈值电压的变化量可以小于0.5V。