摘要:
An integrated circuit structure having substrate contacts formed as a part of the isolation structure and the method to form such structure is described. The integrated circuit structure is composed of a monocrystalline silicon body (2, 4) having a pattern of dielectric isolation surrounding regions of the monocrystalline silicon in the body. The dielectric isolation pattern includes a recessed dielectric portion (14) at and just below the surface of the integrated circuit and a deep portion (30) which extends through the recessed dielectric portion (14) and extends further into the monocrystalline silicon body (2, 4) than the recessed portion. A highly doped polycrystalline silicon substrate contact (30) is located within the deep portion of the pattern of isolation. The substrate contact extends from the surface of the pattern of isolation down to the bottom of the deep portion of the isolation where the contact electrically connects to the silicon body. Any of a variety of integrated circuit device structures may be incorporated within the monocrystalline silicon regions. These devices include bipolar transistors, field effect transistors, capacitors, diodes, resistors and the like.
摘要:
An integrated circuit structure having substrate contacts formed as a part of the isolation structure and method for making the same is described. The integrated circuit structure is composed of a monocrystalline silicon body (2, 4) having a pattern of dielectric isolation surrounding regions of the monocrystalline silicon in the body. The dielectric isolation pattern includes a recessed dielectric portion (22, 24) at and just below the surface of the integrated circuit and a deep portion which extends from the side of the recessed dielectric portion opposite to that portion at the surface of said body into the monocrystalline silicon body. A highly doped polycrystalline silicon substrate contact (20) is located within the deep portion of the pattern of isolation. At certain locations the deep portion of the pattern extends to the surface of the silicon body where interconnection metallurgy can electrically contact the polycrystalline silicon so as to form a substrate contact to the bottom of the deep portion of the isolation where the contact electrically connects to the silicon body. Any of a variety of integrated circuit device structures may be incorporated within the monocrystalline silicon regions. These devices include bipolar transistors, field effect transistors, capacitors, diodes, resistors and the like.
摘要:
An integrated circuit structure having substrate contacts formed as a part of the isolation structure and the method to form such structure is described. The integrated circuit structure is composed of a monocrystalline silicon body (2, 4) having a pattern of dielectric isolation surrounding regions of the monocrystalline silicon in the body. The dielectric isolation pattern includes a recessed dielectric portion (14) at and just below the surface of the integrated circuit and a deep portion (30) which extends through the recessed dielectric portion (14) and extends further into the monocrystalline silicon body (2, 4) than the recessed portion. A highly doped polycrystalline silicon substrate contact (30) is located within the deep portion of the pattern of isolation. The substrate contact extends from the surface of the pattern of isolation down to the bottom of the deep portion of the isolation where the contact electrically connects to the silicon body. Any of a variety of integrated circuit device structures may be incorporated within the monocrystalline silicon regions. These devices include bipolar transistors, field effect transistors, capacitors, diodes, resistors and the like.
摘要:
A high performance bipolar transistor having a shallow emitter and a narrow intrinsic base region is fabricated by a minimum number of process steps. A silicon semiconductor body 10 is provided with regions of monocrystalline silicon isolated from one another by isolation regions (18) an epitaxial layer (14) and a buried subcollector (12). A layer (24) of polycrystalline silicon is deposited on the body. The surface of the polycrystalline silicon layer (24) is oxidized and the polycrystalline silicon is implanted with a base impurity. Silicon nitride and oxide layers (28, 30) are deposited on the polysilicon layer. An opening is made in the surface oxide layer (28) and the silicon nitride layer (30) to define the emitter area of the transistor. The polycrystalline silicon is thermally oxidized to drive the base impurity into the substrate. The thermal oxide is removed in an isotropic etch to leave an oxide sidewall cover (38) on the polycrystalline silicon. An emitter impurity is ion implanted into the polycrystalline silicon in the emitter area and then driven into the substrate. Collector, base and emitter contact openings are made and conductive metallurgy is formed.
摘要:
A method for fabricating high performance NPN bipolar transistors which result in shallow, narrow base devices is described. The method includes depositing a polycrystalline silicon layer (30) over a monocrystalline silicon surface in which the base and emitter regions (42, 44) of the transistor are to be formed. Boron ions (32) are ion implanted into the polycrystalline silicon layer (30) near the interface of the polycrystalline silicon layer with the monocrystalline silicon layer. An annealing of the layer structure partially drives in the boron into the monocrystalline silicon substrate. Arsenic ions (38) are ion implanted into the polycrystalline silicon layer (30). A second annealing step is utilized to fully drive in the boron to form the base region (42) and simultaneously therewith drive in the arsenic to form the emitter region (44) of the transistor. This process involving a two-step annealing process for the boron implanting ions is necessary to create a base with sufficient width and doping to avoid punch-through. There is also described a method for forming NPN transistors in an integrated circuit.