摘要:
PROBLEM TO BE SOLVED: To provide a compound semiconductor substrate, a semiconductor device, and a method for manufacturing the device, in which electric resistance on an interface between an epitaxial layer and the substrate is decreased. SOLUTION: The compound semiconductor substrate 10 comprises a group III nitride and has a surface layer 12 on the surface containing chlorides of 200×10 10 to 12,000×10 10 pieces/cm 2 in terms of Cl and oxides of 3.0 atom% to 15.0 atom% in terms of O. Thereby, the amount of Si on an interface between the compound semiconductor substrate 10 and an epitaxial layer 14 formed thereon is reduced, resulting a decrease in the electric resistance on the interface. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a group III nitride single crystal ingot having a reduced crack generation rate during lengthwise growth, and to provide a group III nitride single crystal substrate manufactured by using the ingot, a method for manufacturing a group III nitride single crystal ingot, and a method for manufacturing a group III nitride single crystal substrate. SOLUTION: A GaN crystal base substrate 10 principal face of which consists of a (0001) plane, having a circular cross section perpendicular to the thickness direction or having a hexagonal cross section perpendicular to the thickness direction and having a side face comprising a {10-10} plane, is subjected to vapor phase etching on the principal face and on the side faces so as to remove a portion of at least 1 μm thickness from the side faces, and then subjected to etching to prepare a base substrate 10A, on which a GaN single crystal 11 is epitaxially grown. As a process modified layer on a corner or side faces of the base substrate is removed by the above etching, polycrystals or crystals of different plane directions are prevented from precipitating around the GaN single crystal ingot. COPYRIGHT: (C)2009,JPO&INPIT