An alternating current solar electric power generation system includes a primary concentrator to concentrate sunlight, one optional reflector to redirect the concentrated sunlight, a concentrating solar PV module, a rotary electric connector, and a motor with an optional gearbox to spin the CPV module. An active region is defined in the substrate and an oxygen-rich silicon layer that is monocrystalline is formed on a top surface of the active region. The inner perimeter of the sleeve is large than the outer perimeter of the core to enable the sleeve to be removed and replaced easily when worn out.