Preface. Introduction. In memory of Günther Harbeke. 1. General reviews: hydrogen in and on crystalline semiconductors. Papers by: N.M. Johnson et al., C.H. van de Walle, R.F. Kiefl and T.L. Estle, J.A. Schaefer, R.A. Street. Hydrogen diffusion and effusion Papers by: S.J. Pearton, J.W. Corbett and J.T. Borenstein, F. Buda et al., W. Beyer, R. Murray, P. de Mierry, A. Etcheberry and M. Aucouturier, R. Rizk et al., R. Rahbi et al., M. Vergnat et al., X.-M. Tang et al., F. Demichelis et al. 3. Hydrogen related states and defects. Papers by: Yu. V. Gorelkinskii and N.N. Nevinnyi, A.A. Bonapasta, R. Jones, J. Tatarkiewicz, W.B. Jackson and S.B. Zhang, J. Weber, M. Singh, J. Weber and M. Konuma, P. Deák et al., M. Kondo, H. Yokomichi and K. Morigaki, A. Szekeres, S.S. Simeonov and E. Kafedjiiska, J. Keinonen et al., M. Stutzmann et al., B. Dischler, F. Fuchs and H. Seelewind, X.T. Meng, L. Meda et al., H. Labidi et al., J. Serra et al., R. Galloni et al., A. Asano, M.J. van den Boogaard et al., J.H. Neethling. Hydrogen complexes. Papers by: G.G. DeLeo, J.B. Boyce and S.E. Ready, M. Gebhard et al., M. Stavola, M. Deicher et al., E.E. Haller, T. Zundel, J. Weber and L. Tilly, A.L. Endrös, W. Krühler and J. Grabmaier, B. Pajot, B. Clerjaud and J. Chevallier, L. Pavesi and P. Giannozzi, Pr. E. Constant, R.C. Newman, P.R. Briddon and R. Jones, B. Theys et al. 5. Surfaces and interfaces. Papers by: C.M. Bertoni et al., S. Nannarone and L. Sorba, Y.J. Chabal, F. Proix, M. Aucouturier, Th. Allinger et al, U. del Pennino et al., J.J. Koulmann et al., P. Raynaud, J.P. Booth and C. Pomot, A. Akremi, J.P. Lacharme and C.A. Sébenne, A. Stesmans and G. van Gorp, Y.G. Wang and S. Ashok, B.I. Craig and P.V. Smith, Z.-y. Wu et al., H.C. Neitzert, M.A. Briere and P. Lechner. 6. Hydrogen incorporation and defect passivation. Papers by: T. Ito et al., A. Bosacchi et al., B.N. Mukashev et al., L. Svob et al., I. Perichaud, H. El Ghitani and S. Martinuzzi, D. Yang et al., M. Capizzi et al., N. Blayo, P. Blom and B. Drevillon, V.I. Marakhonov et al., G. Suchaneck, M. Albert and K. Schade.. List of contributors. Subject index.