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    • 7. 发明申请
    • METHOD FOR FABRICATING A P-CHANNEL FIELD-EFFECT TRANSISTOR ON A SEMICONDUCTOR SUBSTRATE
    • 在半导体基板上制造P沟道场效应晶体管的方法
    • US20050148178A1
    • 2005-07-07
    • US10372989
    • 2003-02-24
    • Johann AlsmeierJurgen Faul
    • Johann AlsmeierJurgen Faul
    • H01L21/8238H01L29/49H01L29/78H01L21/302H01L21/461
    • H01L29/4916H01L21/823842H01L29/7838Y10S438/91Y10S438/918Y10S438/919
    • A p-channel field-effect transistor is formed on a semiconductor substrate. The transistor has an n-doped gate electrode, a buried channel, a p-doped source and a p-doped drain. The transistor is fabricated by a procedure in which, after an implantation for defining an n-type well, an oxidation is performed to form a gate-oxide layer and n-doped polysilicon is subsequently deposited. The latter is doped with boron or boron fluoride particles either in situ or by a dedicated implantation step. In a thermal process, the boron acceptors penetrate through the oxide layer into the substrate of the n-type well, where they form a p-doped zone, which serves for counter doping and sets the threshold voltage. This results in a steep profile that permits a shallow buried channel. The control of the number particles penetrating through the oxide layer is achieved by nitriding the oxide layer in an N2O atmosphere.
    • 在半导体衬底上形成p沟道场效应晶体管。 晶体管具有n掺杂栅电极,掩埋沟道,p掺杂源和p掺杂漏极。 晶体管的制造方法是,在用于限定n型阱的注入之后,执行氧化以形成栅氧化层,随后沉积n掺杂多晶硅。 后者在原位或通过专用注入步骤掺杂硼或氟化硼颗粒。 在热处理中,硼受体穿过氧化物层进入n型阱的衬底,其中它们形成p掺杂区,用于反掺杂并设置阈值电压。 这导致一个陡峭的轮廓,允许一个浅埋的通道。 穿过氧化物层的数量颗粒的控制通过在N 2 O 2气氛中氮化氧化物层来实现。