Use camera sensors to charge smartphones.

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 The smartphone camera sensor is a complementary metal-oxide-semiconductor (CMOS) which converts light into electricity, not just similar to solar panels, but exactly the same, as solar cells are made of the same material.

  I would like to propose to create a channel between the CMOS and the battery, so when the camera is not being used the sensor can create a electron flux capable of giving some charge and extending the battery millage.

  The flux is unilateral by the atomic structure of material itself, so no risk of wasting energy. Besides, the most expensive parts are already in place, the only things to be added is a path between the CMOS and a switch for it when the camera is on.