TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Packaging Structure: In the packaging structure (100), the plates are transparent, where the plates are made from polycarbonate, acrylic resin, or polystyrene. Each first solar cell comprises a first substrate (122) and a first active region (128) disposed on a first surface of the first substrate, and the first surface facing one of the plates. The sum of superficial areas of the first active regions of the first solar cells is larger than a superficial area of the portable electronic device. Each of the first solar cell comprises a first substrate and a first active region disposed on a first surface of the first substrate, the first and a second surfaces (124 and 126) being a pair of opposite surfaces of the first substrate, and the second surface facing one of the plates. Also, the sum of superficial areas of the first active regions of the first solar cells is larger than a superficial area of the portable electronic device. The packaging structure further comprises a second solar cell fastened on an inner surface of the lid in the box and electrically connected to the cable, where the lid is transparent. The second solar cell comprises a second substrate and a second active region disposed on a third surface of the second substrate, where the third surface of the second substrate is facing the lid. The lid is made from polycarbonate, acrylic resin, or polystyrene. The second solar cell comprises a second substrate and a second active region disposed on a third surface of the second substrate, the third and a fourth surfaces being a pair of opposite surfaces of the second substrate, and the fourth surface of the second substrate facing the lid. Moreover, the packaging structure comprises a connector connected to an end of the cable for physically connecting the portable electronic device. The connector is a Universal Serial Bus (USB). The connector is directly connected to the first solar cells. The packaging structure as well comprises an inverter physically and electrically connected to the first solar cells for converting voltage generated from the first solar cells, where the cable is directly connected to the inverter. Alternatively, the packaging structure comprises: at least the plate selectively folded to form a box or unfolded, where at least a portable electronic device is contained in the box when the plate is folded; the set of solar cells fastened on the plate, where the solar cells are located in the box when the plate is folded; and at least the cable physically and electrically connected to the solar cells and comprising a connector for connecting the portable electronic device. Each solar cell comprises a substrate and an active region disposed on a first surface of the substrate, the first and a second surfaces being a pair of opposite surfaces of the substrate, and the second surface facing the plate. The sum of superficial areas of the active regions of the solar cells is larger than a superficial area of the portable electronic device. The packaging structure additionally comprises a set of fastening elements disposed on the plate for selectively connected or disconnected to each, where the fastening elements are connected to each when the plate are folded.