Chalcopyrites, in particular those with a wide band gap, are fascinating materials in terms of their technological potential in the next generation of thin-film solar cells and in terms of their basic material properties. They exhibit uniquely low defect formation energies, leading to unusual doping and phase behavior and to extremely benign grain boundaries. This book collects articles on a number of those basic material properties of wide-gap chalcopyrites, comparing them to their low-gap cousins. They explore the doping of the materials, the electronic structure and the transport through interfaces and grain boundaries, the formation of the electric field in a solar cell, the mechanisms and suppression of recombination, the role of inhomogeneities, and the technological role of wide-gap chalcopyrites.

Susanne Siebentritt has been working on the electronic and transport properties of materials for photovoltaics since 1989. She is working at Hahn-Meitner-Institut, Berlin. Her current topic are the doping defects and the transport in chalcopyrite single and polycrystalline materials. On this topic she has published 35 papers.

Cu-Chalcopyrites-Unique Materials for Thin-Film Solar Cells.- Band-Structure Lineup at I-III-VI2 Schottky Contacts and Heterostructures.- Defects and Self-Compensation in Semiconductors.- Confine Cu to Increase Cu-Chalcopyrite Solar Cell Voltage.- Photocapacitance Spectroscopy in Copper Indium Diselenide Alloys.- Recombination Mechanisms in Cu(In,Ga)(Se,S)2 Solar Cells.- Shallow Defects in the Wide Gap Chalcopyrite CuGaSe2.- Spatial Inhomogeneities of Cu(InGa)Se2 in the Mesoscopic Scale.- Electro-Optical Properties of the Microstructure in Chalcopyrite Thin Films.- Electronic Properties of Surfaces and Interfaces in Widegap Chalcopyrites.- Interfaces of Cu-Chalcopyrites.- Bandgap Variations for Large Area Cu(In,Ga)Se2 Module Production.