17 µA/cm^2 @ 0.5 V across a 7 µm thick film.

6 layers each 17 cm x 17 cm would be 4.9 mA @ 3 V which would be enough for quite a few of my current and planned projects, assuming no energy storage. With some kind of energy storage to store up the energy harvested when the microcontroller is sleeping it would be enough even for my projects that periodically send sensor readings by radio.