Gianluca Coletti is program manager of PV Tandem Technology and Applications at TNO Energy Transition in the Netherlands. He is also adjunct professor at UNSW Sydney, in Australia. Gianluca Coletti has a Master in Physics from the University of Rome “La Sapienza” in Italy and obtained his PhD at the University of Utrecht in the Netherlands. From 2000 to 2003 worked at the research lab of Eurosolare SpA (Italy) and from 2004 to 2018 worked as senior research at ECN Solar Energy (the Netherlands ) now TNO. His research focuses on the development and technology transfer of innovative cells and modules technologies. He is one of the world recognized expert in the area of defects in silicon with 20 years of experience in academic and industrial R&D with institutes and companies worldwide.