Epitaxial lift-off process for GaAs solar cells controlled by InGaAs internal sacrificial stressor layers and a PMMA surface stressor - Ramu, Prabudeva; Aho, Arto; Polojärvi, Ville; Aho, Timo; Tukiainen, Antti; Hakkarainen, Teemu; Reuna, Jarno; Lyytikäinen, Jari; Hytönen, Roosa; Guina, Mircea (2022)