1. EDF R&D, 6 quai Watier, 78401 Chatou Cedex, France
2. IRDEP, Institute of Research and Development for Photovoltaic Energy, UMR 7174 CNRS-EDF-Chimie ParisTech, 78401 Chatou Cedex, France
3. CNRS, 6 quai Watier, 78401 Chatou Cedex, France
4. LPN, Laboratory for Photonics and Nanostructures, UPR 20 CNRS, Route de Nozay, 91460 Marcoussis, France
5. IPVF, 8 rue de la Renaissance, 92160 Antony, France