Theoretical and experimental operating wavelength of GaAs/Al0.25Ga0.75As IR photodetectors A. Almaggoussi, A. Abounadi, H. Akabli, K. Zekentes and M. Androulaki Eur. Phys. J. Appl. Phys., 45 2 (2009) 20301 Published online: 31 January 2009 DOI: 10.1051/epjap/2009003