Energy harvesting photodiodes with integrated 2D diffractive storage capacitance

Authors:
Nathaniel J. Guilar;Erin G. Fong;Travis Kleeburg;Diego R. Yankelevich;Rajeevan Amirtharajah
Affiliations:
University of California, Davis, CA, USA;University of California, Davis, CA, USA;University of California, Davis, CA, USA;University of California, Davis, CA, USA;University of California, Davis, CA, USA
Venue:
Proceedings of the 13th international symposium on Low power electronics and design
Year:
2008

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Integrated energy-harvesting photodiodes with diffractive storage capacitance

IEEE Transactions on Very Large Scale Integration (VLSI) Systems

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Abstract

Integrating photodiodes with logic and exploiting on-die interconnect capacitance for energy storage can enable new, low-cost energy harvesting wireless systems. To further explore the tradeoffs between optical efficiency and capacitive energy storage for integrated photodiodes, an array of photovoltaics with various diffractive storage capacitors was designed in TSMC's 90nm CMOS technology. Transient effects from interfacing the photodiodes with switching regulators were examined. A quantitative comparison between 90nm and 0.35μm CMOS logic processes for energy harvesting capabilities was carried out. Measurements show an increase in power generation for the newer CMOS technology, however at the cost of reduced output voltage.