Lateral bipolar transistor

Details Lateral bipolar transistor Lateral bipolar transistor

H - Electricity

01

L

356/148

H01L 29/70 (2006.01) H01L 21/22 (2006.01) H01L 29/735 (2006.01)

Patent

CA 1053380

Abstract of the Disclosure A lateral bipolar transistor has a semiconductor substrate of first conductivity type with an epitaxial layer arranged thereon of second conductivity type. Collector and emitter zones of first con- ductivity type are laterally arranged in the epitaxial layer. A base terminal contact zone connects with the epitaxial layer and a buried layer of second conductivity type is placed in the epitaxial layer below the emitter and collector zones. The buried layer has a doping concentration higher than the epitaxial layer so that a minority carrier current emanating from the emitter zone in a vertical direction is minimized. A doping profile of the emitter zone and portions of the base adjacent thereto is provided such that an additional potential barrier is created adjacent to and directly beneath the emitter zone in order to further minimize minority charge carriers emanating at a vertical direction from the emitter zone. The doping profile does not create any additional potential barrier in a lateral direction with respect to the emitter zone and the emanation of minority carriers from the emitter zone in a lateral direction is substantially uneffected.

261548

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