The design of broad band anti-reflection coatings for solar cell applications Angirekula Siva Rama Krishna, Samrat Lagnajeet Sabat and Mamidipudi Ghanashyam Krishna Eur. Phys. J. Appl. Phys., 77 1 (2017) 10301 Published online: 27 January 2017 DOI: 10.1051/epjap/2017160376