H - Electricity – 01 – L
Patent
H - Electricity
01
L
356/37
H01L 31/00 (2006.01) H01L 31/111 (2006.01)
Patent
CA 1113190
A B S T R A C T Disclosed is a light-controllable thyristor having a semiconductor body with cathode and anode faces, the body comprising a cathode side base zone the doping of which is reduced in a region adjacent the anode side thereof, a main emitter zone located in the base zone at the cathode face, a region at the cathode face intended to be exposed to light during operation of the thyristor, and an auxiliary emitter zone located in the base zone at the cathode face between the main emitter zone and said region. The main emitter and auxiliary emitter zones are provided with main emitter and auxiliary emitter electrodes respectively, the auxiliary emitter electrode also contacting the base zone. At least one trench is provided in the cathode face of the body extending into the base zone and having a depth at least equal to that of the auxiliary emitter zone, the trench bounding the periphery of the auxiliary emitter zone facing the main emitter zone and serving to separate a part of the auxiliary emitter electrode which contacts the auxiliary emitter zone from a part thereof which contacts the base zone. while the base zone has a high degree of doping where required, the auxiliary thyristor has a high light sensitivity.
300385
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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