Patent ID: 9640519
Date: 2017-05-02
CPC Classifications: H01L,Y02E,Y02P

Claim:
1. A semiconductor device comprising: an integrated circuit (IC) chip having a first side with terminals of the IC, an opposite second side, and a thickness; a slab of low-grade silicon (l-g-Si) having a first side lightly p-doped, covered by an insulating layer and configured as a ridge framing a depression including a recessed central area suitable to accommodate the chip, and the opposite second side heavily n-doped to form the pn-junction of a photovoltaic cell; the ridge having a first surface in a first plane, and the recessed central area having a second surface in a second plane spaced from the first plane by a depth at least equal to the chip thickness; the ridge covered by a metal layer configured as device terminals, and the central area covered by a metal layer configured as attachment pads for the IC terminals with one pad connected to a metal-filled deep-silicon via extending from the central area to the pn-junction; and the terminals of the chip attached to the pads of the central slab area so that the second chip side is co-planar with the device terminals on the slab ridge, whereby the slab serves as the package of the IC chip and the photovoltaic cell powers the IC.