Patent ID: 6274893
Filing Date: 2001-08-14
Classification: H01L

Abstract:
A compound semiconductor device comprising:a channel layer formed on a compound semiconductor substrate, and formed of material which has a first donor concentration and a first bandgap;a carrier supply layer formed on the channel layer, and formed of material which has a second donor concentration being higher than the first donor concentration and a second bandgap being wider than the first bandgap;a first compound semiconductor layer formed on the carrier supply layer, and containing donors in at least one of a lower layer portion and an upper layer portion within a range of impurity concentration of 1.times.10.sup.16 to 1.times.10.sup.17 atoms/cm.sup.3 ;a gate electrode connected to the first compound semiconductor layer;a cap layer formed on the first compound semiconductor layer in a source region and a drain region which are formed on both sides of the gate electrode, and formed of material which has a third donor concentration being higher than the first donor concentration and a third bandgap being narrower than the second bandgap;a source electrode at least a part of which is formed on the cap layer in the source region; anda drain electrode at least a part of which is formed on the cap layer in the drain region.