TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The first junction comprises at least one III-V material having a composition of lattice-matched to Si(0.3)Ge(0.7), and the second junction (125) comprises essentially of silicon-germanium (SiGe) having a Ge composition of approximately 75-95%. The structure comprises a template layer disposed between the substrate and the first junction, where the template layer comprises a graded-composition layer. The handle substrate: comprises at least one of a polymer or a metal; and is substantially flexible. The second junction comprises a graded-composition layer. The threading dislocation density of the second junction is higher than a threading dislocation density of the first junction by at least a factor of two. The structure: contains no bonded interface prior to bonding of the structure to handle substrate; and comprises a tunnel junction (135) disposed between the first and the second junctions. The substrate comprises essentially of silicon. The template layer comprises a gallium arsenic phosphide (GaAsP) initiation layer disposed in contact with the first junction.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: In the method: the entire substrate is removed, and further comprises removing at least a portion of the template layer (120) thereafter; and prior to bonding the structure to the handle substrate, the structure comprises at least one of a cap layer (140) (comprising essentially of doped or undoped silicon) disposed over the second junction, or a contact layer disposed over the second junction, where the contact layer comprises an alloy of silicon and a metal. The method further comprises: forming a contact over the first junction over a surface opposed to the handle substrate, after step (c); and prior to step of forming the contact, forming the cap layer over the first junction over the surface opposed to the handle substrate, where the step of forming the contact comprises reacting a portion of the cap layer with a metal. EXAMPLE - No suitable example given.