The book "Wide-Gap Chalcopyrites" offers a comprehensive analysis of the properties and potential of chalcopyrite materials with a wide bandgap. These materials are of great interest for the development of the next generation of thin-film solar cells, as they possess unique properties that support their application in photovoltaic technology. The authors, Uwe Rau and Susanne Siebentritt, present a collection of articles that address the fundamental material properties of these specific chalcopyrites. Topics such as doping, electronic structure, transport across interfaces and grain boundaries, as well as the formation of electric fields in solar cells are discussed. The book compares wide bandgap chalcopyrites with their narrow bandgap relatives and highlights their technological relevance as well as the mechanisms for suppressing recombination.