Journal ArticlePower Scavenging Microsystem for Smart Contact LensesPourshaban, Erfan; Karkhanis, Mohit U.; Deshpande, Adwait; Banerjee, Aishwaryadev; Hasan, Md Rabiul; Nikeghbal, Amirali; Ghosh, Chayanjit; Kim, Hanseup; Mastrangelo, Carlos H.<title>Abstract</title> <p>On‐the‐eye microsystems such as smart contacts for vision correction, health monitoring, drug delivery, and displaying information represent a new emerging class of low‐profile (≤ 1 mm) wireless microsystems that conform to the curvature of the eyeball surface. The implementation of suitable low‐profile power sources for eye‐based microsystems on curved substrates is a major technical challenge addressed in this paper. The fabrication and characterization of a hybrid energy generation unit composed of a flexible silicon solar cell and eye‐blinking activated Mg–O₂metal–air harvester capable of sustainably supplying electrical power to smart ocular devices are reported. The encapsulated photovoltaic device provides a DC output with a power density of 42.4 µW cm⁻²and 2.5 mW cm⁻²under indoor and outdoor lighting conditions, respectively. The eye‐blinking activated Mg–air harvester delivers pulsed power output with a maximum power density of 1.3 mW cm⁻². A power management circuit with an integrated 11 mF supercapacitor is used to convert the harvesters’ pulsed voltages to DC, boost up the voltages, and continuously deliver ≈150 µW at a stable 3.3 V DC output. Uniquely, in contrast to wireless power transfer, the power pack continuously generates electric power and does not require any type of external accessories for operation.</p>Wiley2024-03-1310499270Small1613-6810https://doi.org/10.1002/smll.2024010681932602National Science Foundation