摘要:
A new method is provided for the creation of an oxide layer that contains three different thicknesses. A first layer of oxide is grown on the surface of a substrate; a first layer of photoresist is deposited and patterned thereby partially exposing the surface of the underlying first layer of oxide. A nitrogen implant is performed into the surface of the underlying substrate; the photoresist mask of the first layer of photoresist is removed. A second layer of photoresist is deposited and patterned, the first layer of oxide is removed from above and surrounding the implanted regions of the substrate. The second mask of resist is removed. The first layer of oxide is reduced in thickness, its thickness is restored to a first thickness by a blanket growth of a second layer of oxide over the exposed surface of the substrate (where no ion implant has been performed) to a third thickness, over the surface of the substrate where the ion implant has been performed to a second thickness and over the surface of the first layer of oxide thereby restoring this layer of oxide to its original first thickness.
摘要:
A new method of fabricating and programming and erasing a Flash EEPROM memory cell is achieved. A semiconductor substrate is provided. A tunneling oxide layer is formed overlying said semiconductor substrate. A first polysilicon layer is deposited overlying the tunneling oxide layer. An interpoly oxide layer is deposited overlying the first polysilicon layer. A second polysilicon layer is deposited overlying the interpoly oxide layer. The second polysilicon layer, the interpoly oxide layer, the first polysilicon layer, and the tunneling oxide layer are patterned to form control gates and floating gates for planned Flash EEPROM memory cells. Ions are implanted to form drain junctions for planned Flash EEPROM memory cells in the semiconductor substrate where the drain junctions are shallow and abrupt. Ions are implanted to form angled pocket junctions adjacent to the drain junctions. The angled pocket junctions are implanted at a non-perpendicular angle with respect to the semiconductor substrate and are counter-doped to the drain junctions. Ions are implanted to form source junctions where the junctions are deeper and less abrupt than the drain junctions to complete the Flash EEPROM memory cells in the integrated circuit device.
摘要:
A new method of fabricating and programming and erasing a Flash EEPROM memory cell is achieved. A semiconductor substrate is provided. A tunneling oxide layer is formed overlying said semiconductor substrate. A first polysilicon layer is deposited overlying the tunneling oxide layer. An interpoly oxide layer is deposited overlying the first polysilicon layer. A second polysilicon layer is deposited overlying the interpoly oxide layer. The second polysilicon layer, the interpoly oxide layer, the first polysilicon layer, and the tunneling oxide layer are patterned to form control gates and floating gates for planned Flash EEPROM memory cells. Ions are implanted to form drain junctions for planned Flash EEPROM memory cells in the semiconductor substrate where the drain junctions are shallow and abrupt. Ions are implanted to form angled pocket junctions adjacent to the drain junctions. The angled pocket junctions are implanted at a non-perpendicular angle with respect to the semiconductor substrate and are counter-doped to the drain junctions. Ions are implanted to form source junctions where the junctions are deeper and less abrupt than the drain junctions to complete the Flash EEPROM memory cells in the integrated circuit device.
摘要:
An apparatus and method for detecting defect sizes in polysilicon and source-drain semiconductor devices and methods for making the same. Implemented is a double bridge test structure that includes a resistor path of first semiconductor material, such as doped silicon comprising a plurality of strip segments and with interconnection segments. A plurality of strips of second semiconductor material having a substantially lower resistivity are connected to form parallel circuit interconnections with the corresponding strip segments. The test structure is formed by masking techniques wherein a prescribed mask region enables portions of the silicon resistor or deposited polysilicon to be selectively silicided to form silicide and polycide, respectively. One embodiment for testing for defects in a polysilicon layer uses polycide as the low-resistivity strips, enabling the testing of open and short-circuit defects. A second embodiment selectively suicides exposed portions of a source-drain resistor, thereby enabling testing for defects in a source-drain layer of a metal oxide semiconductor. Defect sizes are determined by comparing the measured resistance values with predetermined width and spacings of the strips.
摘要:
A MRAM cell structure includes a bottom electrode; a magnetic tunnel junction unit disposed on the bottom electrode; a top electrode disposed on the magnetic tunnel junction unit; and a blocking layer disposed on the top electrode, wherein the blocking layer is wider than the magnetic tunnel junction unit for preventing against formation of a short circuit between a contact and the magnetic tunnel junction unit.
摘要:
A MRAM cell structure includes a bottom electrode; a magnetic tunnel junction unit disposed on the bottom electrode; a top electrode disposed on the magnetic tunnel junction unit; and a blocking layer disposed on the top electrode, wherein the blocking layer is wider than the magnetic tunnel junction unit for preventing against formation of a short circuit between a contact and the magnetic tunnel junction unit.
摘要:
A non-volatile memory cell and a method of manufacturing the same are provided. The non-volatile memory cell includes a floating gate over a semiconductor substrate, a first capacitor comprising a first plate, the floating gate, and a dielectric therebetween, a second capacitor comprising a second plate, the floating gate, and a dielectric therebetween, a third capacitor comprising a third plate connected to the floating gate, and a fourth plate, wherein the third and fourth plates are formed in metallization layers over the semiconductor substrate. The first plate of the first capacitor includes a first doped region and a second doped region in the semiconductor substrate. The non-volatile memory cell further includes a transistor comprising a gate electrode over the semiconductor substrate, wherein a source/drain region of the transistor is connected to the first doped region of the first capacitor.
摘要:
A new method of fabricating and programming and erasing a Flash EEPROM memory cell is achieved. A tunneling oxide layer is formed overlying a semiconductor substrate. A first polysilicon layer, an interpoly oxide layer and then a second polysilicon layer are deposited. The second polysilicon layer, the interpoly oxide layer, the first polysilicon layer, and the tunneling oxide layer are patterned to form control gates and floating gates for planned Flash EEPROM memory cells. Ions are implanted to form drain junctions where the drain junctions are shallow and abrupt. Ions are implanted to form angled pocket junctions adjacent to the drain junctions. The angled pocket junctions are implanted at a non-perpendicular angle with respect to the semiconductor substrate and are counter-doped to the drain junctions. Ions are implanted to form source junctions that are deeper and less abrupt than the drain junctions.
摘要:
A non-volatile memory cell includes a floating gate over a semiconductor substrate, a first capacitor comprising a first plate, the floating gate, and a dielectric therebetween, a second capacitor comprising a second plate, the floating gate, and a dielectric therebetween, a third capacitor comprising a third plate connected to the floating gate, and a fourth plate, wherein the third and fourth plates are formed in metallization layers over the semiconductor substrate. The first plate of the first capacitor includes a first doped region and a second doped region in the semiconductor substrate. The non-volatile memory cell further includes a transistor comprising a gate electrode over the semiconductor substrate, wherein a source/drain region of the transistor is connected to the first doped region of the first capacitor.
摘要:
A new method of fabricating and programming and erasing a Flash EEPROM memory cell is achieved. A tunneling oxide layer is formed overlying a semiconductor substrate. A first polysilicon layer, an interpoly oxide layer and then a second polysilicon layer are deposited. A second polysilicon layer is deposited overlying the interpoly oxide layer. The second polysilicon layer, the interpoly oxide layer, the first polysilicon layer, and the tunneling oxide layer are patterned to form control gates and floating gates for planned Flash EEPROM memory cells. Ions are implanted to form drain junctions where the drain junctions are shallow and abrupt. Ions are implanted to form angled pocket junctions adjacent to the drain junctions. The angled pocket junctions are implanted at a non-perpendicular angle with respect to the semiconductor substrate and are counter-doped to the drain junctions. Ions are implanted to form source junctions that are deeper and less abrupt than the drain junctions.