FIG. 1 is a top perspective view of a first embodiment of a photovoltaic device showing the new design;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a front side elevational view thereof;
FIG. 5 is a back side elevational view thereof;
FIG. 6 is a top plan view thereof; and
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a top perspective view of a second embodiment of a photovoltaic device showing the new design;
FIG. 9 is a left side elevational view thereof;
FIG. 10 is a right side elevational view thereof;
FIG. 11 is a front side elevational view thereof;
FIG. 12 is a back side elevational view thereof;
FIG. 13 is a top plan view thereof; and
FIG. 14 is a bottom plan view thereof;
FIG. 15 is a top perspective view of a third embodiment of a photovoltaic device showing the new design;
FIG. 16 is a left side elevational view thereof;
FIG. 17 is a right side elevational view thereof;
FIG. 18 is a front side elevational view thereof;
FIG. 19 is a back side elevational view thereof;
FIG. 20 is a top plan view thereof; and
FIG. 21 is a bottom plan view thereof;
FIG. 22 is a top perspective view of a fourth embodiment of a photovoltaic device showing the new design;
FIG. 23 is a left side elevational view thereof;
FIG. 24 is a right side elevational view thereof;
FIG. 25 is a front side elevational view thereof;
FIG. 26 is a back side elevational view thereof;
FIG. 27 is a top plan view thereof; and,
FIG. 28 is a bottom plan view thereof.
The broken lines shown represent the portions of the photovoltaic device that form no part of the claimed design. All of the lines on the top surface of FIGS. 1, 6, 8, 13, 15, 20, 22, and 27 are broken lines and from no part of the claimed design.