Researchers at Fujitsu Laboratories, Ltd.described a hybrid energy harvesting device generating power either via photovoltaic or thermoelectric means. The device was fabricated using organic materials.
Finally, researchers hailing from the University of Twente, Nankai University, and Debye Institute discussed amorphous-silicon and CIGS solar cells they grew on chips from two CMOS generations. The efficiency of the Amorphous-silicon (a-Si) solar cells reaches 5.2%, copper-indium-gallium-selenide (CIGS) cells 7.1%. The CMOS electronics underneath the PV cells worked just fine, say researchers. The main integration issues: adhesion, surface topography, metal ion contamination, process temperature, and mechanical stress can be resolved while maintaining standard photovoltaic processing.
However, the chip's energy use must be well below 1 mW, say the researchers.
More info: http://www.his.com/~iedm/
University of Twente: http://www.utwente.nl/organization/stories/chip-provides-its-own-power