Characterisation of Cu(In1–xGax)5Se8 by spectroscopic ellipsometry

We would like to thank the financial support of the Spanish and German governments through the Exchange Program, project HA 2006-0025 and Belarus-Moldova project 08.820.05.14BF. One of us (SL) would like to thank CRDF-MRDA (project MYSSP-1402) and three of us (ML, EJF and JMM) would like to thank the Comunidad de Madrid (project S-0505/ENE-0123 FOTOFLEX) for financial support.