%0 Journal Article %J physica status solidi (RRL)–Rapid Research Letters %D 2016 %T Effects of heavy alkali elements in Cu (In, Ga) Se2 solar cells with efficiencies up to 22.6% %A Jackson, Philip %A Wuerz, Roland %A Hariskos, Dimitrios %A Lotter, Erwin %A Witte, Wolfram %A Powalla, Michael %B physica status solidi (RRL)–Rapid Research Letters %V 10 %P 583–586 %G eng %0 Journal Article %J Solar energy materials and solar cells %D 2013 %T High-efficiency Cu(In,Ga)Se2 cells and modules %A Powalla, Michael %A Jackson, Philip %A Witte, Wolfram %A Hariskos, Dimitrios %A Paetel, Stefan %A Tschamber, Carsten %A Wischmann, Wiltraud %B Solar energy materials and solar cells %V 119 %P 51–58 %G eng