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CIGS Cells and Modules With High Efficiency on Glass and Flexible SubstratesPowalla, Michael; Witte, Wolfram; Jackson, Philip; Paetel, Stefan; Lotter, Erwin; Wuerz, Roland; Kessler, Friedrich; Tschamber, Carsten; Hempel, Wolfram; Hariskos, Dimitrios; Menner, Richard; Bauer, Andreas; Spiering, Stefanie; Ahlswede, Erik; Friedlmeier, Theresa Magorian; Blazquez-Sanchez, David; Klugius, Ines; Wischmann, Wiltraud · IEEE Journal of Photovoltaics · 2014