Preface. Energy Needs - Energy Sources. Introduction. Consumption. Conventional Sources of Energy. Alternative Energy Sources. Nuclear fusion. Solar energy. Temperature differences. Thermodynamics. Ocean temperature-difference generators. Solar-thermal. Solar-electric. References. The Sun and Sunlight. Introduction. Sunlight. Geometrical Effects. Weather. Light Collection. Lens systems. Mirrors. Optical materials. Maximum optical concentration. References. Semiconductors. Introduction. Crystal Structure. Quantum Mechanics and Energy Bands. Electrons and Holes. Currents. Recombination and Carrier Lifetime. Junctions. References. Light-Semiconductor Interaction. Introduction. Reflection. Light Interaction. Preliminary Material Selection. Absorption. Reflection and Absorption. References. Basic Theoretical Performance. Introduction. Local Electric Fields. PN Junction Electrical Characteristics. Heterojunction Electrical Characteristics. Electrical Characteristics of Schottky Junctions. Open Circuit Voltage and Short Circuit Current. Optimum Power Conditions. References. Solar Cell Configuration and Performance. Introduction. Optical Orientation. Device Design - Minority Carrier Collection. Device Design - Saturation Current. Device Design - Series Resistance. Solar Cell Performance - Discussion. References. Advanced Approaches. Introduction. Temperature Effects. Heat Flow within a Solar Cell. Optical Concentration - Photocurrent. Performance under Concentration. References. Advanced Approaches - II. Introduction. Second Stage Solar Power Systems. Third Generation Solar Cell Systems. Miscellaneous Approaches. References. Polycrystalline and Amorphous Solar Cells. Introduction. Polycrystalline Solar Cells. Cadmium Sulfide/Copper Sulfide. Copper Indium Selenide (CIS). Polycrystalline Silicon. Thin film Cadmium Telluride.