Semiconductor device

Details Semiconductor device Semiconductor device

1991-04-12

1992-09-22

Prenty, Mark V.

357 16, 357 4, 357 58, 357 61, H01L 2972, H01L 29161, H01L 2712, H01L 2912

Patent

active

051501856

ABSTRACT:
A semiconductor device comprises an n-type emitter layer, a p-type base layer formed in contact with the n-type emitter layer, a first collector layer formed in contact with the base layer, and having a bandgap substantially equal to that of the p-type base layer, and a second collector layer formed in contact with the first collector layer, and having a bandgap wider than that of the first collector layer, the first collector layer having such a thickness that kinetic energy of electrons injected from the p-type base layer and flowing in the first collector layer is substantially 1.0 to 1.5 times the bandgap of the first collector layer at an interface between the first collector layer and the second collector layer. Electrons injected into the base layer can flow at very high speed in the first collector layer, because the first collector layer has a narrow bandgap. In addition, the avalanche breakdown never takes place in the first collector layer, because kinetic energy of the electrons is lower than substantially 1.0 to 1.5 times the bandgap of the first collector layer.

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