摘要:
A charge control structure (1001, 1002) is provided for a bipolar junction transistor to control the charge distribution in the depletion region extending into the bulk collector region when the collector-base junction is reverse-biased. The charge control structure comprises a lateral field plate (1002) above the upper surface of the collector (1008) and dielectrically isolated from the upper surface of the collector and a vertical field plate (1001) which is at a side of the collector (1008) and is dielectrically isolated from the side of the collector. The charge in the depletion region extending into the collector is coupled to the base (1003) as well as the field-plates (1001, 1002) in the charge-control structure, instead of only being coupled to the base of the bipolar junction transistor. In this way, a bipolar junction transistor is provided where the dependence of collector current on the collector-base voltage, also known as Early effect, can be reduced.
摘要:
Complementary bipolar semiconductor device (Cbi semiconductor device) with a substrate of a first conductivity type, active bipolar transistor regions in the substrate in which the base, emitter, and collector of vertical bipolar transistors are arranged; vertical epitaxial base npn bipolar transistors in a first subset of the active bipolar transistor regions; vertical epitaxial base pnp bipolar transistors in a second subset of the active bipolar transistor regions; collector contact regions which are each arranged bordering on an active bipolar transistor region; and flat field isolation regions which each laterally bound the active bipolar transistor regions and the collector contact regions. A flat field isolation region of a first type with a first extended depth in the direction of the substrate interior is arranged between the first or the second or both the first and the second subset of active bipolar transistor regions on one side and the adjacent collector contact regions on the other, and flat field isolation areas of a second type, with a second extended depth larger than the first, bound the active bipolar transistor regions and the collector contact regions, viewed in cross section, on the sides thereof facing away from each other.
摘要:
According to one exemplary embodiment, a method for forming an NPN and a vertical PNP device on a substrate comprises forming an insulating layer over an NPN region and a PNP region of the substrate. The method further comprises forming a buffer layer on the insulating layer and forming an opening in the buffer layer and the insulating layer in the NPN region, where the opening exposes the substrate. The method further comprises forming a semiconductor layer on the buffer layer and in the opening in the NPN region, where the semiconductor layer has a first portion situated in the opening and a second portion situated on the buffer layer in the PNP region. The first portion of the semiconductor layer forms a single crystal base of the NPN device and the second portion of the semiconductor layer forms a polycrystalline emitter of the vertical PNP device.
摘要:
An epitaxial layer is formed on a p type silicon substrate (30) in which a plurality of P+ buried layer regions (31, 33), a plurality of N+ buried layer regions (32), and a P+ field layer region (33) occupying most of the substrate (30) surface are diffused. Following a plurality of heating steps, a first thin intrinsic epitaxial cap layer (36) is formed, a first gas purge cycle is performed, a second thin epitaxial layer cap layer (37) is formed, a second gas purge cycle is performed, and an N- epitaxial layer (38) is deposited.
摘要:
The present invention is an electronic memory cell (200) and a method for the cell’s fabrication comprising a first transistor (201) configured to be coupled to a bit line. The first transistor (201) has an essentially zero voltage drop when activated and is configured to control an operation of the memory cell (200). A second transistor (203) is configured to operate as a memory transistor and is coupled to the first transistor (201). The second transistor (203) is further configured to be programmable with a voltage about equal to a voltage on the bit line.
摘要:
Herstellungsverfahren für laterale Bipolartransistoren auf SOI-Substrat, bei dem auf eine mit einer Grunddotierung versehene Mesa (3) eine stegförmige Gate-Elektrode (8/9) aufgebracht und ganzflächig mit einer TEOS-Schicht (10) mit als Spacer (11, 12) fungierenden vertikalen Anteilen an den Flanken dieser Gate-Elektrode bedeckt wird. Unter Verwendung von Lackmasken (13, 14) werden Dotierstoffe für einen Kollektor-Bereich (4) und einen Emitter-Bereich (6) eingebracht. Die Basisimplantierung erfolgt nach dem Entfernen der TEOS-Schicht (10) im Bereich des Spacers (11) längs eines Randes der Gate-Elektrode.
摘要:
Process for making an integrated-circuit (IC) chip with junction-isolated complementary bipolar transistors. In this process an N-well (11) is formed in a P-type substrate (10). P-type dopant is implanted in the N-well (11) to become a sub-collector (12) for a pnp transistor. N-type dopant is implanted in the substrate (10) in a location laterally displaced from the N-well (11) to become a sub-collector (18) for an npn transistor. N-type material is implanted in the N-well (11) to begin the formation of an isolation wall (16) for the pnp transistor. A P-type epitaxial (epi) layer (20) then is grown over the P-type substrate (10). N-type material is implanted in the epi layer (20) to complete the isolation wall (22) for the pnp transistor, and to complete the collector (24) for the npn transistor. P-type and N-type material also is implanted in the P-type epi layer (20) to form the bases (30, 34) and emitters (32, 40) for the npn and pnp transistors.