Wavy growth and related defects in strain-balanced multi-quantum wells for photovoltaic devices L. Nasi, C. Ferrari, A. Lanzi and L. Lazzarini Eur. Phys. J. Appl. Phys., 27 1-3 (2004) 431-433 Published online: 15 July 2004 DOI: 10.1051/epjap:2004068