Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Having insulated electrode
Patent
1998-09-18
2000-01-18
Whitehead, Jr., Carl
Active solid-state devices (e.g., transistors, solid-state diode
Field effect device
Having insulated electrode
438265, 438241, 438259, 438266, 438270, 438264, 438258, 438263, 257316, 257301, H01L 21336, H01L 218242
Patent
active
060159847
ABSTRACT:
An improved process for making embedded memory cells is disclosed which is based on a bifurcated two-polysilicon structure. The embedded memory cell contains a memory cell portion and an embedded capacitor portion. The memory cell portion contains a floating gate, a control gate and an oxide
itride/oxide (ONO) layer sandwiched therebetween, and the embedded capacitor portion similarly contains a top electrode, a bottom electrode, and an oxide
itride/oxide layer also sandwiched therebetween. The floating gate and the bottom electrode of the embedded capacitor portion are simultaneously made from the same poly1 layer. However, unlike the prior art devices, the poly1 layer is bifurcated via simple photolithographic sequences such that the bottom electrode of the embedded capacitor portion has a high degree of doping than the floating gate. As a result, the bifurcated two-polysilicon structure provides the same level of performance, with regard to both the memory cell portion and the capacitor portin, as the conventional three-polysilicon structure, and no comprise is necessary.
REFERENCES:
patent: 5532181 (1996-07-01), Takebuchi et al.
patent: 5556799 (1996-09-01), Hong
patent: 5780341 (1998-07-01), Ogura
patent: 5885871 (1999-03-01), Chan et al.
Jr. Carl Whitehead
Liauh W. Wayne
Warren Matthew E.
Winbond Electronics Corp.
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