%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