Interface stress at thin film semiconductor heterostructures

The interface stress at thin film semiconductor heterostructures has been examined for three technologically important ZnSSe/GaAs, InGaPAs/GaAs, and AlGaAs/GaAs heterostructures. For characterization of the interface stress we have developed a new high-sensitivity method using the characteristic Cr-related luminescence lines in GaAs crystal. Based on a series of experimental results obtained with these three semiconductor heterostructures, the origin of the interface stress has been identified, the results showing that the interface stress in the case of ZnSSe/GaAs is well explained by thermal stress and the interface stress of InGaPAs/GaAs and AlGaAs/GaAs by lattice-mismatched stress.