A revolution is already underway which includes the development of autonomous wireless sensors, low-power consumer electronics, smart homes, domotics and the Internet of Things.    All these elements require efficient and easy-to-integrate energy harvesting devices for their power. Billions of wireless sensors are expected to be installed in interior environments over the coming decades.   Indoor photovoltaic (PV) power sources, on ultra-thin curvable substrates, will have the potential ...