About the cover
The cover shows an artist's impression of the repeated production of flexible films by remote epitaxy. Although epitaxy is widely used in the semiconductor industry, cost still restricts the technique to only certain materials. In this issue, Jeehwan Kim and his team suggest a possible way to overcome that limitation. They place a monolayer of graphene between the substrate and the ‘epilayer’ grown on top. The graphene layer does not interfere with epitaxial growth but, crucially, it allows the film produced to be released from the substrate easily, thereby allowing the substrate to be reused. The ability to ‘copy and paste’ semiconductor films from underlying substrates and transfer them to a substrate of interest could have implications for heterointegration in photonics and flexible electronics. Cover image: Felice C. Frankel (with artwork by Nik Spencer).