Introduction;Christophe Ballif Explaining the role of thin-film silicon within PV today and tomorrow Basic Properties of amorphous silicon (a-Si);Arvind Shah and Wolfhard Beyer Structure of amorphous silicon "Free" and "trapped" carriers (electrons and holes), mobility gap Gap states Optical absorption; optical gap and sub-bandgap absorption Transport, conductivity and recombination Doping of amorphous silicon layers Hydrogen in amorphous silicon layers; Wolfhard Beyer Alloys (with Germanium and Carbon); Wolfhard Beyer Conclusions Basic properties of hydrogenated µc-Si:H; Friedhelm Finger History Structural properties of µc-Si:H Optical properties Electrical properties and transport Metastabilty -- Instabilty Comparison with amorphous silicon Alloys (ongoing research work) Conclusions Theory of solar cell devices; Arvind Shah, Corinne Droz and Martin Python Conversion of light into electrical carriers by a semi-conductor diode The "pn-type" or "classical" diode: Dark characteristics The "pn-type" or "classical" diode: Properties under illumination Limits on solar cell efficiency η The "pin-type" diode Summary and conclusions of theoretical part Tandem and multi-junction solar cells;Martin Python and Arvind Shah Introduction; general concept Principle of two-terminal tandem cell Practical problems of two-terminal tandem cells Typical tandem and multi-junction cells Spectral response (SR) and External Quantum Efficiency (EQE) measurements Conclusions Module Fabrication and Performance; Horst Schade and Jean-Eric Bourée Plasma-enhanced chemical vapor deposition (PECVD) Hot Wire chemical vapour deposition (HWCVD) Doped layers Transparent conductive oxides (TCO) as contact layers Laser scribing and series connection of cells Module performan;EM>Friedhelm Finger History Structural properties of µc-Si:H Optical properties Electrical properties and transport Metastabilty -- Instabilty Comparison with amorphous silicon Alloys (ongoing research work) Conclusions Theory of solar cell devices; Arvind Shah, Corinne Droz and Martin Python Conversion of light into electrical carriers by a semi-conductor diode The "pn-type" or "classical" diode: Dark characteristics The "pn-type" or "classical" diode: Properties under illumination Limits on solar cell efficiency η The "pin-type" diode Summary and conclusions of theoretical part Tandem and multi-junction solar cells;Martin Python and Arvind Shah Introduction; general concept Principle of two-terminal tandem cell Practical problems of two-terminal tandem cells Typical tandem and multi-junction cells Spectral response (SR) and External Quantum Efficiency (EQE) measurements Conclusions Module Fabrication and Performance; Horst Schade and Jean-Eric Bourée Plasma-enhanced chemical vapor deposition (PECVD) Hot Wire chemical vapour deposition (HWCVD) Doped layers Transparent conductive oxides (TCO) as contact layers Laser scribing and series connection of cells Module performann solar cells;Martin Python and Arvind Shah Introduction; general concept Principle of two-terminal tandem cell Practical problems of two-terminal tandem cells Typical tandem and multi-junction cells Spectral response (SR) and External Quantum Efficiency (EQE) measurements Conclusions Module Fabrication and Performance; Horst Schade and Jean-Eric Bourée Plasma-enhanced chemical vapor deposition (PECVD) Hot Wire chemical vapour deposition (HWCVD) Doped layers Transparent conductive oxides (TCO) as contact layers Laser scribing and series connection of cells Module performance Module finishing Conclusions Application Examples of Solar Cells; Various contributors, edited by Horst Schade and Arvind Shah Building-integrated photovoltaics (BIPV) - aspects and examples Stand-alone and portable applications (Oppizzi) Indoor applications of a-Si solar cells; J. Randall Space Applications;N. Wyrsch Conclusions Large-area thin-film Electronics; Nicolas Wyrsch Thin-film transistors (TFTs) and Display Technology Large-area imagers Thin-film sensors on C-MOS Chips (Light imagers, Particle sensors, particle imagers) Conclusions.