Wysips, a company based in Aix-en-Provence, in southern France, has developed a photovoltaic film which can be built into a mobile phone, laptop or tablet screen and charge the battery from any artificial or natural light source.

According to Wysips chief executive, Ludovic Deblois, “With 10 minutes in the sun you will be able to communicate for two minutes. To recharge completely you will have to expose it for six hours, so our technology is not necessarily for a full recharge but rather for an energy boost for specific applications. For example, for security if you have to make an emergency call."

The inventors hope the first mobile phones equipped with the Wysips film will be in stores by the end of this year.