ORAL

SESSION: SISAMMonAM-R9	3rd Intl. Symp. Surfaces and Interfaces of Sustainable, Advanced Materials (SISAM)
Mon Oct, 23 2017	Room: Condesa III
Session Chairs: Jean-Marie Dubois; Isabelle Braems; Session Monitor: TBA

15:00: [SISAMMonAM06] Keynote
High-efficiency Solar Cells Based on Polycrystalline Cu(In,Ga)Se2 Thin Film: A Discussion on the Influence of Alkali Fluoride Post-deposition Treatments
Nicolas Barreau¹ ; Ludovic Arzel¹ ; Sylvie Harel¹ ; Thomas Lepetit¹ ; ¹Universite de Nantes, IMN, Nantes, France;
Paper Id: 315 [Abstract]

Cu(In,Ga)Se2 thin film solar cell technology has recently achieved the outstanding power conversion efficiency of 22.6 %. Such level of performance is surprising because these devices are based on polycrystalline layers and hetero-junctions; hence implying numerous homo- and hetero-interfaces. Nevertheless, the recent efficiency breakthrough was made possible thanks to specific post- deposition treatments of the Cu(In,Ga)Se2 absorber, which imply both surface and grain boundary modifications. So far, the best solar cells were prepared from absorbers which were treated by heavy alkali fluoride, namely KF or RbF. The present contribution aims at presenting and discussing the various models proposed up to date to explain grains and grain boundary modifications and their influence on the related solar cell performance.