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    • 31. 发明授权
    • Semiconductor device and manufacturing method thereof
    • 半导体装置及其制造方法
    • US07572718B2
    • 2009-08-11
    • US11092773
    • 2005-03-30
    • Yohei KannoYasuko Watanabe
    • Yohei KannoYasuko Watanabe
    • H01L21/3205
    • H01L29/42384H01L21/268H01L27/1292H01L29/4908H01L29/66757H01L29/78621
    • In the case of providing an LDD region for a TFT, it is necessary to form separately an insulating film to be a mask or to contrive the shape of a gate electrode layer in order to have the concentration difference in impurities injected in a semiconductor film; therefore, the number of patterning steps has increased as a matter of course and the step has become complicated. A semiconductor device according to one feature of the invention comprises a semiconductor layer including a channel region, a pair of impurity regions, and a pair of low-concentration impurity regions; and a gate electrode layer having a single layer structure or a laminated structure, of which film thickness is not even, which is formed to be in contact with the semiconductor layer by sandwiching a gate insulating film therebetween. Particularly, the gate electrode layer, of which film thickness is not even, can be formed easily by employing a droplet discharging method; thus, the convenience of the droplet discharging method can be taken with full advantage.
    • 在为TFT提供LDD区域的情况下,需要分别形成作为掩模的绝缘膜或者为了使注入半导体膜中的杂质的浓度差成为栅极电极层的形状; 因此,图案化步骤的数量当然增加,并且步骤变得复杂。 根据本发明的一个特征的半导体器件包括:半导体层,包括沟道区,一对杂质区和一对低浓度杂质区; 以及通过在其间夹有栅极绝缘膜而形成为与半导体层接触的膜厚不均匀的单层结构或层叠结构的栅极电极层。 特别地,通过采用液滴喷射法可以容易地形成膜厚不均匀的栅电极层; 因此,可以充分利用液滴喷射方法的方便性。