This project is focusing on the rational design of asymmetric semiconductor (nano)particles having appropriate catalyst deposits on both sides. Such Janus-type objects will be able to split water into H2 and O2 under sun light, without any need of physical wiring. The project will deal with two kinds of semiconducting particles: 1) inorganic semiconductors related with the well-established know-how of ISM and 2) particles based on organic materials conventionally used in the field of organic photovoltaic devices, incorporating bulk heterojunctions, being provided thanks to the know-how of IMS.