1. Departament d’Enginyeria Electronica Electrica i Automatica, Rovira i Virgili University, Tarragona, Spain
2. CONACYT–Center for Engineering and Industrial Development (CIDESI), Microtechnology Division (DMT), Santiago de Querétaro, Querétaro, Mexico
3. Institute of Chemical Research of Catalonia, The Barcelona Institute of Science and Technology, Tarragona, Spain
4. Departamento de Ingeniería Eléctrica, Sección de Electrónica del Estado Sólido, CINVESTAV-IPN, Mexico City, Mexico