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This work evaluates the concept of employing light-emitting diodes (LEDs) to harvest solar energy. Due to the optical properties of the semiconductor materials employed in the fabrication of LEDs, LEDs can absorb photons and generate electron-holes. Thus, in principle LEDs can behave as small solar cells from which power can be harvested. Unlike solar cells, LEDs are not optimized to absorb light...
A circuit that is able to harvest energy from substrate/well photodiodes fabricated in standard complimentary metal-oxide-semiconductor (CMOS) processes is presented. The motivation for using substrate/well photodiodes over diffusion/well photodiodes for energy harvesting are the increased quantum efficiency due to deeper junctions, the elimination of the parasitic diode effect, and better silicon...
Context aware Physical Activity (PA) monitoring of humans is important for the study of diseases associated with obesity and lack of physical activity. This paper introduces a wearable context aware PA monitoring device which determines if the user is indoors or outside in situations of disrupted Global Positioning System (GPS) reception. In addition to a GPS sensor, multiple light and temperature...
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