摘要:
A compound semiconductor device including a semi-insulating GaAs substrate; an electron transit layer consisting of an InGAs layer formed on the substrate; a mitigation layer formed on the electron transit layer, and consisting of an AlGaInAs layer; and a barrier layer formed on the mitigation layer, consisting of an AlGaAs layer, and having a higher A1 composition ratio than the mitigation layer. Crystal defects in the barrier layer can be reduced, and the compound semiconductor device can have large gains. The barrier layer and the mitigation layers are so thin that a gate voltage sufficiently influences the electron transit layer, and the compound semiconductor device can have a threshold voltage higher than 0V.
摘要:
The present invention includes a process of growing a compound semiconductor layer locally, after applying radical particles that do not become an etchant of a compound semiconductor layer to an insulating mask so as to terminate the surface of the insulating mask in a state that the compound semiconductor layer is covered with the insulating mask, on the surface of the compound semiconductor layer exposed from the insulating mask.
摘要:
A high electron mobility transistor type group III-V compound semiconductor device includes a substrate of a group III-V compound semiconductor, an electron transfer layer of a group III-V compound semiconductor formed on the substrate, an impurity doped electron supply layer of a group III-V compound semiconductor having a wider band gap and smaller electron affinity than the electron transfer layer, and a spacer layer of a group III-V compound semiconductor having a lattice mismatch with the electron supply layer, the spacer layer being formed between the electron transfer layer and the electron supply layer. A HEMT type group III-V compound semiconductor device is provided which uses an Si-doped electron supply layer of material such as InGaP other than AlGaAs and has good device properties.