The Energy Level Alignment at the Buffer/Cu(In,Ga)Se2 Thin‐Film Solar Cell Interface for CdS and GaOx oleh Donald Valenta, Hasan Arif Yetkin, Tim Kodalle, Jakob Bombsch, Raul Garcia‐Diez, Claudia Hartmann, Shigenori Ueda, Roberto Félix, Johannes Frisch, Lucas Bodenstein‐Dresler, Regan G. Wilks, Christian A. Kaufmann, Marcus Bär