NOVELTY - Semiconductor structure comprises a semiconductor substrate (41); semiconductor active region (42) formed on the substrate; semiconductor contact layer (43) grown on top of the semiconductor active region; metal migration semiconductor barrier layer (45) embedded within the contact layer; and metal contact (44) deposited on the contact layer.    USE - The structure, e.g. solar cell structure, is used in cell-interconnect-coverglass assembly (claimed). It is used for solar cells that provide power to a spacecraft, such as satellite, and for terrestrial solar cells.    ADVANTAGE - The structure prevents metal migration from contact layer into active layer. It has improved high temperature reliability, and prolonged operation time.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (a) a cell-interconnect-coverglass assembly, comprising a solar cell; interconnects welded onto the metal contact; and coverglass covering the solar cell and the interconnects;    (b) contact structure (47) comprising a semiconductor contact layer, and metal migration semiconductor barrier layer in intimate contact with the semiconductor contact layer; and    (c) a method of forming a semiconductor structure with metal migration semiconductor barrier layers, comprising growing a semiconductor structure; blocking the metal migration from the metal contact towards the semiconductor active region with the metal migration semiconductor barrier layer; and inhibiting metal/semiconductor reactions and formation of undesirable phases within the semiconductor active region.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross sectional view of a solar cell device structure.    Substrate (41)    Active region (42)    Semiconductor contact layer (43)    Metal contact (44)    Metal migration semiconductor barrier layer (45)    Contact structure (47)    Active layers (81)    Active layers (82)    First region (83)    Second region (84)    Third region (85)    Titanium layer (86)    Gold layer (87)    Silver layer (88)