chapter 1 Non-conventional photovoltaic technology: a need to reach goals / chapter 2 Trends in the development of solar photovoltaics / chapter 3 Thermodynamics of solar energy converters Peter Wu¨rfel -- chapter 4 Tandem cells for very high concentration A W Bett -- chapter 5 Quantum wells in photovoltaic cells N J Ekins-Daukes and KWJ Barnham / chapter 6 The importance of the very high concentration in third-generation solar cells / chapter 7 Intermediate-band solar cells A Martı´, L Cuadra and A Luque -- chapter 8 Multi-interface novel devices: model with a continuous substructure / chapter 9 Quantum dot solar cells A J Nozik -- chapter 10 Progress in thermophotovoltaic converters Bernd Bitnar, Wilhelm Durisch, Fritz von Roth, Gu¨nther Palfinger, / chapter 11 Solar cells for TPV converters / chapter 12 Wafer-bonding and film transfer for advanced PV cells C Jaussaud, E Jalaguier and D Mencaraglia -- chapter 13 Concentrator optics for the next-generation photovoltaics P Benı´tez and J C Min˜ano.