Dye sensitized solar cell based on 1,8-naphthalene benzimidazole comprising carboxyl group S. Erten, E. Eren and S. Icli Eur. Phys. J. Appl. Phys., 38 3 (2007) 227-230 Published online: 13 June 2007 DOI: 10.1051/epjap:2007086