Artistic View of the Photo-Thermionic Effect in a Graphene-Wse2-Graphene Heterostructure. ©Icfo| Fab (IMAGE) ICFO-The Institute of Photonic Sciences Caption Artistic view of the photo-thermionic effect in a graphene-WSe2-graphene heterostructure. Credit ©ICFO| Fabien Vialla Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.