Portable electronic device

A solar cell (50) and a portable electronic device (66) are provided. The solar cell (50) includes a semiconductor material (54) configured to absorb light for generating a current. The solar cell further includes a positive contact (58) and a negative contact (62). In addition, the negative contact (62) is configured to couple with an external interface. The portable electronic device (66) includes an energy storage unit (154). The portable electronic device (66) also includes a semiconductor material (54) configured to absorb light for generating a current, a positive contact (58), and a negative contact (62). The negative contact (54) of the portable electronic device (66) is configured to couple with an external interface.