1. IMT Mines Saint-Etienne; Provence Microelectronics Center; Department of Bioelectronics; F - 13541 Gardanne France
2. Aix Marseille University; CNRS; CINAM; Marseille 13009 France
3. IMT Mines Saint-Etienne; Provence Microelectronics Center; Department of Flexible Electronics; F - 13541 Gardanne France