Growth of heterostructures on InAs for high mobility device applications

The growth of heterostructures lattice matched to InAs(100) substrates for high mobility electronic devices has been investigated. The oxide removal process and homoepitaxial nucleation depends on the deposition parameters to avoid the formation of surface defects that can propagate through the structure during growth which can result in degraded device performance. The growth parameters for InAs homoepitaxy were found to be within an extremely narrow range when using As 4 with a slight increase using As 2 . High structural quality lattice matched AlAs x Sb 1− x buffer layer was grown on InAs(100) substrates using a digital growth technique with the AlAs mole fraction adjusted by varying the incident As flux. Using the AlAs x Sb 1− x buffer layer, the transport properties of thin InAs channel layers were determined on conducting native substrates.