Home News Short News IHK awards Max Planck instructors with the Golden Badge of Honour Publications of Michael Powalla All genres Journal Article (1) Journal Article (1) 1. Journal Article Laemmle, A.; Wuerz, R.; Schwarz, T.; Cojocaru-Mirédin, O.; Choi, P.-P.; Powalla, M.: Investigation of the diffusion behavior of sodium in Cu(In,Ga)Se2 layers. Journal of Applied Physics 115 (15), 154501 (2014) MPG.PuRe DOI