Indian, Korean researchers develop light-powered supercapacitors

https://www.thehindu.com/sci-tech/science/indian-korean-researchers-develop-light-powered-supercapacitors/article66950924.ece

"replacing the conventional lithion-ion batteries in portable and wearable devices such as smartphones, tablets, laptops and smartwatches... stainless steel electrode with a quartz transparent window in order to harvest visible light. A specially prepared ‘down-conversion’ phosphor is introduced before the quartz window to facilitate light-induced charging... charged keeping under light, powered we moving days or weeks... space, satellites by powering remote sensors, back-up power"