Patent ID: 8994069
Filing Date: 2015-03-31
Classification: H01L

Abstract:
1. A BiHEMT, comprising: a substrate formed with gallium arsenide; a pseudomorphic high electron mobility transistor (pHEMT) substructure formed on the substrate; a stacked separating layer comprising a cap layer, a separating layer and a sub-collector layer sequentially stacked from bottom to top, at least one of the cap layer, the separating layer and the sub-collector layer having a carbon concentration within 5×10 a heterojunction bipolar transistor (HBT) substructure formed on the stacked separating layer, wherein the cap layer and the pHEMT substructure are combined to form a pHEMT, the sub-collector layer and the HBT substructure are combined to form an HBT such that the pHEMT and the HBT are joined together by the separating layer, and each of the cap layer and the sub-collector layer has a thickness of 0.5˜1000 nm.