Patent ID: 11876144
Assignee: VISHAY SEMICONDUCTOR GMBH
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method of forming a photosensitive semiconductor component, the method comprising:
(i) providing a semiconductor substrate of a first conductivity type as a collector layer;
(ii) forming a less doped layer of the first conductivity type above the semiconductor substrate;
(iii) forming a semiconductor base layer of a second conductivity type therein or thereabove;
(iv) forming an emitter layer of the first conductivity type therein or thereabove, such that a part of the base layer is not covered by the emitter layer,
wherein at least one of the less doped layer or the semiconductor base layer is formed with regions of different thickness, and thereafter the emitter layer is formed in a region having a greatest thickness of the at least one of the less doped layer or the semiconductor base layer; and wherein
the thickness of a first region of the base layer is k6 times the thickness of a first region of the less doped layer, where k6 is greater than 0.2, greater than 0.3, smaller than 0.5, smaller than 0.3, smaller than 0.1, or smaller than 0.05; or
the thickness of a second region of the base layer is k7 times the thickness of a second region of the less doped layer, where k7 is greater than 0.1, greater than 0.2, greater than 0.5, greater than 0.6, smaller than 0.9, smaller than 0.8, or smaller than 0.7; or
the thickness of the emitter layer is k8 times the thickness of the second region of the base layer, where k8 is greater than 0.2, greater than 0.4, greater than 0.6, smaller than 0.99, smaller than 0.9, smaller than 0.8, or smaller than 0.7.