Patent ID: 8896082

Claim:
An integrated circuit-solar cell device disposed in or on a first major surface of a substrate, the device comprising: a well region disposed in or on the first major surface of the substrate, wherein the well region is of a first dopant type; a doped region disposed in or on a second major surface, opposing the first major surface, of the substrate, wherein the doped region enhances the efficiency or operation of the solar cell; a solar cell including: a first region disposed in or on the well region, wherein the first region is of the first dopant type; and a second region disposed in or on the first major surface of the substrate and outside the well region, wherein the second region is of a second dopant type; an integrated circuit, disposed in the substrate, including: a first transistor disposed in or on the well region, wherein the first transistor is of a first type; and a second transistor disposed in or on the first major surface of the substrate and outside the well region, wherein the first transistor is of a second type; and power management circuitry, coupled to a battery, to selectively and electrically couple the solar cell to the battery when the integrated circuit is in an inactive mode.