Three-dimensional Ge/SiGe multiple quantum wells deposited on Si(001) and Si(111) patterned substrates

In this work we address three-dimensional heterojunctions, demonstrating that photoluminescence from defect-free, Ge/SiGe multiple quantum well (MQW) micro-crystals grown on deeply patterned Si(001) and Si(111) substrates exhibit similar radiative intensity and analogous spectral shape.