Method of forming a semiconductor structure having MOS, bipolar, and
varactor devices
    1.
    发明授权
    Method of forming a semiconductor structure having MOS, bipolar, and varactor devices 失效
    形成具有MOS,双极和变容二极管器件的半导体结构的方法

    公开(公告)号:US5405790A

    公开(公告)日:1995-04-11

    申请号:US155882

    申请日:1993-11-23

    摘要: A varactor (10, 115, 122) is formed using a BICMOS process flow. An N well (28) of a varactor region (13) is formed in an epitaxial layer (22) by doping the epitaxial layer (22) with an N type dopant. A cathode region (55, 132) is formed in the N well (28) by further doping the N well (28) with the N type dopant. Cathode electrodes (91, 114) are formed by patterning a layer of polysilicon (62, 86) over the epitaxial layer (22). Subsequently, the cathode electrodes (91, 114) are doped with an N type dopant. A region adjacent the cathode region (55, 132) is doped to form a lightly doped region (103, 117). The lightly doped region (103, 117) is doped with a P type dopant to form an anode region (109, 119).

    摘要翻译: 使用BICMOS工艺流程形成变容二极管(10,115,122)。 通过用N型掺杂剂掺杂外延层(22),在外延层(22)中形成变容二极管区域(13)的N阱(28)。 通过用N型掺杂剂进一步掺杂N阱(28),在N阱(28)中形成阴极区(55,132)。 通过在外延层(22)上图案化多晶硅层(62,86)来形成阴极电极(91,114)。 随后,阴极电极(91,114)掺杂有N型掺杂剂。 与阴极区域(55,132)相邻的区域被掺杂以形成轻掺杂区域(103,117)。 轻掺杂区域(103,117)掺杂有P型掺杂剂以形成阳极区域(109,119)。