NOVELTY - A photovoltaic (PV) cell device comprises semiconductor substrates, an insulating layer provided between the substrates to electrically isolate the first substrate from the second substrate, PV cells each including a n-type region and a p-type region, vertical trenches terminating at the insulating layer, isolation structures provided within the vertical trenches and an interconnect layer patterned to connect the PV cells.    USE - For generating electrical power.    ADVANTAGE - The device is inexpensive and results in minimum defects.    DETAILED DESCRIPTION - A photovoltaic (PV) cell device (100) comprises a first semiconductor substrate (101); a second semiconductor substrate (102) bonded to the first semiconductor substrate; an insulating layer provided between the first and second substrates to electrically isolate the first substrate from the second substrate; PV cells defined on the first substrate, each PV cell including a n-type region and a p-type region; vertical trenches provided in the first substrate to separated the PV cells, the vertical trenches terminating at the insulating layer; isolation structures (92, 93) provided within the vertical trenches, each isolation structure including a first isolation layer including oxide and a second isolation layer including polysilicon; and an interconnect layer patterned to connect the PV cells to provide X number of PV cells in series and Y number of PV cells in parallel, where the n-type regions are formed by performing ion implantation of arsenic to provide shallow junction depths for the n-type regions, so that PV cell device is optimized for sunlight.    An INDEPENDENT CLAIM is also included for a packaged PV device comprising a PV structure, an electronic component to perform a given function, and a transparent enclosure that encloses both the PV structure and the electronic component.    DESCRIPTION OF DRAWING(S) - The figure illustrates a cross-section of PV device.    PV device (100)    Semiconductor substrates (101, 102)    Isolation structures (92, 93)