This authoritative reference covers the various aspects of materials science that will impact on the next generation of photovoltaic (PV) module technology. The emphasis on materials brings a fresh perspective to the literature and highlights crucial issues. Special attention is given to thin film PV materials, an area that is growing more rapidly than crystalline silicon and could dominate in the long term. The book addresses the fundamental aspects of PV solar cell materials and gives a comprehensive description of each major thin film material, either in research or production. Particular weight is given to the key materials drivers of solar conversion efficiency, long term stability, materials costs, and materials sustainability.