A printed energy harvesting and storage circuit powered by ambient office lighting and its use to power a\nprinted display is reported. The autonomous device is composed of three printed electronic components:\nan organic photovoltaic module, a carbon-nanotubes-only supercapacitor and an electrochromic display\nelement. Components are fabricated from safe and environmentally friendly materials, and have been\nfabricated using solution processing methods, which translate into low-cost and high-throughput\nmanufacturing. A supercapacitor made of spray-coated carbon nanotube based ink and aqueous NaCl\nelectrolyte was charged using a printed organic photovoltaic module exposed to office lighting conditions.\nThe supercapacitor charging rate, self-discharge rate and display operation were studied in detail.\nThe supercapacitor self-discharge rate was found to depend on the charging rate. The fully charged\nsupercapacitor was used as a power source to run the electrochromic display over 50 times.
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