As things in our everyday life become more and more connected to the internet, devices will need to run without wires or batteries.

By 2025, an estimated 75 billion IoT devices will take root among our daily lives, a majority of which will be located indoors. Researchers at Uppsala University in Sweden have developed a new way to power IoT devices by using dye-sensitized photovoltaic cells to convert indoor light from fluorescent lamps and LEDs into electricity. This research has the potential to revolutionize indoor digital sensing for a wide range of spaces such as smart greenhouses, offices, and even shelves.

These ambient light harvesters are highly efficient and low cost — an important recipe for IoT sustainability.