摘要:
A strained silicon layer fabrication employs a substrate having successively formed thereover: (1) a first silicon-germanium alloy material layer; (2) a first silicon layer; (3) a second silicon-germanium alloy material layer; and (4) a second silicon layer. Within the fabrication each of the first silicon-germanium alloy layer and the second silicon-germanium alloy layer is formed of a thickness less than a threshold thickness for dislocation defect formation, such as to provide attenuated dislocation defect formation within the strained silicon layer fabrication.
摘要:
A method of removing a silicon nitride or a nitride-based bottom etch stop layer in a copper damascene structure by etching the bottom etch stop layer using a high density, high radical concentration plasma containing fluorine and oxygen to minimize back sputtering of copper underlying the bottom etch stop layer and surface roughening of the low-k interlayer dielectric caused by the plasma.
摘要:
A method for alternately electrodepositing and electro-mechanically polishing to selectively fill a semiconductor feature with metal including a) providing an anode assembly and a semiconductor wafer disposed in spaced apart relation including an electrolyte there between the semiconductor wafer including a process surface including anisotropically etched features arranged for an electrodeposition process; b) applying an electric potential across the anode assembly and the semiconductor wafer to induce an electrolyte flow at a first current density to electrodeposit a metal filling portion onto the process surface; c) reversing the electric potential to reverse the electrolyte flow at a second current density to electropolish the process surface in an electropolishing process; and, d) sequentially repeating the steps b and c to electrodeposit at least a second metal filling portion to substantially fill the anisotropically etched features.
摘要:
Embedded DRAM cells within an ASIC having a pass transistor with a gate oxide having a thickness equal to the thickness of the gate oxide of the logic core. This allows the embedded DRAM cell to be activated by signals having voltage levels equal to the voltage levels created by the logic core. If the gate oxide has a thickness that is equal to the gate oxide thickness of the peripheral circuits, a signal provided by the word line voltage generator has voltage levels equal to those provided by peripheral circuits, and signal provided by the bit line voltage generator has voltage levels equal to those provided by logic circuits within the logic core. If the gate oxide has a thickness that is equal to the thickness of the gate oxide of the logic circuits, a signal provided by the word line voltage generator has voltage levels equal to those provided by the logic circuits, and the bit line voltage generator has voltage levels equal to those provided by the logic circuits.
摘要:
A gas distribution system for improving asymmetric etching and deposition control over a substrate diameter in a plasma reactor including a plasma reactor chamber further including a substrate holder for holding a substrate surface disposed in a lower portion of said plasma reactor; at least one gas distributor disposed within the plasma reactor chamber for distributing reactant gases where at least one gas distributor including a plurality of gas feed zones in communication with at least one gas source for selectively delivering a gas flow independently to at least one of the plurality of gas feed zones.
摘要:
A method of forming a vertical transistor memory device comprises the following process steps. Before forming the trenches, FOX regions are formed between the rows. Then form a set of trenches with sidewalls and a bottom in a semiconductor substrate with threshold implant regions the sidewalls. Form doped drain regions near the surface of the substrate and doped source regions in the base of the device below the trenches with oppositely doped channel regions therebetween. Form a tunnel oxide layer over the substrate including the trenches. Form a blanket thin floating gate layer of doped polysilicon over the tunnel oxide layer extending above the trenches. Etch the floating gate layer leaving upright floating gate strips of the floating gate layer along the sidewalls of the trenches. Form an interelectrode dielectric layer composed of ONO over the floating gate layer and over the tunnel oxide layer. Form a blanket thin control gate layer of doped polysilicon over the interelectrode dielectric layer. Pattern the control gate layer into control gate electrodes. Form spacers adjacent to the sidewalls of the control gate electrode.
摘要:
The present invention provides a method of manufacturing MOS device having threshold voltage adjustment region 28 ormed using a large angled implant. The invention's angled implant serves as both (a) a Vt adjustment I/I and (b) a Channel stop I/I by (1) increasing the threshold voltage (Vt) and (2) reducing the leakage current. The method comprises forming spaced field oxide regions having bird's beaks on a semiconductor substrate. A field implant is performed using the spaced field oxide regions as an implant mask formed a deep channel stop region 24. Next, a sacrificial oxide layer 20 is formed over the resultant surface. In a critical step, a threshold voltage adjustment region 28 is formed by performing a large angled implant of a p-type ions. The p-type ions into are implanted into the channel region 19 and under the bird's beak 18 such that the threshold voltage is higher under the bird's beak than in the channel region 19. A MOS transistor is then formed over the channel region. The large angled threshold voltage implant of the present invention eliminates the reverse narrow width effect (e.g., reduced threshold voltage (Vt) and increased leakage currents).
摘要:
A semiconductor memory device is formed on a doped semiconductor substrate, and covered with a tunnel oxide layer covered in turn with a doped first polysilicon layer. The first polysilicon layer is patterned into a pair of floating gate electrodes. An interelectrode dielectric layer covers the floating gate electrodes, the sidewalls of the floating gate electrodes and the edges of the tunnel oxide below the floating gate electrodes. A second polysilicon layer overlies the interelectrode dielectric layer and is in turn covered by a tungsten silicide layer. A second dielectric layer covers the tungsten silicide layer. A control gate electrode which spans the pair of floating gate electrodes is formed by the second polysilicon layer, the tungsten silicide and the first and second dielectric layers patterned into a gate electrode stack providing a control gate electrode spanning across the pair of floating gate electrodes. There are source/drain regions in the substrate self-aligned with the control gate electrode.
摘要:
A method and structure for the evaluation of the density of charge induced to a semiconductor substrate during exposure to radiation as a result of integrated circuits processing procedures such as ion implantation and plasma etching is disclosed. A plurality of stacked gate field effect transistors, wherein each stacked has a charge collection capacitor attached to the gate, is fabricated on a semiconductor substrate. Each charge collection capacitor has an area that is different from every other charge collection capacitor. The to substrate is exposed to a radiation source. The threshold voltage for each of the stacked gate field effect transistors is measured. The difference in threshold voltage for the stacked gate transistors is proportional to the amount of charge induced during the exposure to the radiation and the density of the charge induced by the exposure to the radiation can be calculated from the comparison of the threshold voltage and the area of the charge collection capacitors.
摘要:
A MOSFET device structure, on a silicon on insulator layer, in which a body contact to the silicon on insulator layer exists, has been developed. The MOSFET device structure features a heavily doped P type body contact region in a lightly doped source and drain region of the MOSFET device structure, formed from an ion implantation through a metal silicide layer. The addition of the body contact results in more controllable device characteristics, in terms of drain currents, etc., than for counterparts fabricated in silicon on insulator layer, without the use of a body contact.