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Power innovation for wearables

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“Novel high-specific-power solar cells for powering wearable electronics”

Speaker: Koosha Nassiri Nazif, Ph.D., Postdoctoral Scholar in Electrical Engineering, Stanford University

Abstract: A lightweight, flexible solar cell could seamlessly power or charge wearable electronic devices both indoors and outdoors. For successful adoption, such a solar cell needs to be eco-friendly and bio-compatible, and reliably provide high power-per-weight (specific power) at low cost. Modern solar cell technologies miss at least one of these criteria. Emerging transition metal dichalcogenides (TMDs) are promising candidates for flexible high-specific-power photovoltaics due to their excellent optical and electrical properties. However, challenges such as Fermi-level pinning at the metal contact–TMD interface and the inapplicability of traditional doping schemes have prevented most TMD solar cells from exceeding 2% power conversion efficiency (PCE). In this talk, I explain how we addressed these fundamental issues and as a result achieved record PCE of 5.1% and record specific power of 4.4 W g−1 in flexible TMD (WSe2) solar cells, the latter on par with established thin-film solar cell technologies. We further project that future TMD solar cells on thinner substrates and with higher PCE could achieve an additional 10x increase in specific power, providing unprecedented capabilities for wearable electronics.

 

“An introduction to and demonstration of multipath wireless power technology with Ossia founder Hatem Zeine”

Speaker: Hatem Zeine, Founder, President and Chief Technology Officer, Ossia Inc. and Bryan Ehrenfreund, Vice President, Global Sales, Ossia Inc.

Abstract: Ossia is a Redmond, WA based company that has developed wireless power technology that overcomes the main power and efficiency limitations of other wireless power solutions by applying the physics principle of “retro-directivity” that Proves Maximum Power Theorem to transmit wireless power safely. Cota® Real Wireless Power™ is a patented technology that delivers power over-the-air, at a distance, safely, without the need for line of sight and is leading the way for wireless power globally. Cota is the first and currently only wireless power technology that has FCC approval to send power at unlimited distance and without needing an exclusion zone (the system to be triggered off when people or pets are near). Ossia has obtained regulatory approval in 60 countries. The company is actively working with its growing partner ecosystem to integrate Cota technology into a range of products from Consumer and Industrial IoT, Smart Home, Consumer Electronics, Retail, Enterprise, Automotive, Medical Devices, Sensors and more. 

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