Standing Waves Investigation of InAs/InP Superlattices

Abstract

X-ray standing waves measurements have been performed on a set of six lnAsP/InP superlattices exhibiting a wide range of lattice strain values and on both the (002) and (004) reflections. The objective was to assess the XSW technique as a structural probe in superlattices. For samples with perpendicular lattice misfit less than 1.5% we fmd clear XSW modulations in the As fluorescence; this signal is well reproduced by simulations performed by solving the Takagi-Taupin equations. For samples with higher misfit a negligible XSW signal is found, indicating considerable lattice disorder.