title: New insights into the Mo/Cu(In,Ga)Se2interface in thin film solar cells: Formation and properties of the MoSe2interfacial layer.
abstract: Being at the origin of an ohmic contact, the MoSe2interfacial layer at the Mo/Cu(In,Ga)Se2interface in CIGS (Cu(In,Ga)Se2and related compounds) based solar cells has allowed for very high light-to-electricity conversion efficiencies up to 22.3%. This article gives new insights into the formation and the structural properties of this interfacial layer. Different selenization-steps of a Mo covered glass substrate prior to the CIGS deposition by co-evaporation led to MoSe2interfacial layers with varying thickness and orientation, as observed by x-ray diffraction and atomic resolution transmission electron microscopy. A novel model based on the anisotropy of the Se diffusion coefficient in MoSe2is proposed to explain the results. While the series resistance of finished CIGS solar cells is found to correlate with the MoSe2orientation, the adhesion forces between the CIGS absorber layer and the Mo substrate stay constant. Their counter-intuitive non-correlation with the configuration of the MoSe2interfacial layer is discussed and related to work from the literature.
authors: Institut de Recherche et Développement sur l'Energie Photovoltaïque (IRDEP), UMR 7174 CNRS-EDF-Chimie ParisTech (PSL), 6 Quai Watier, 78400 Chatou, France.
authors: T
authors: T
authors: Klinkert
authors: Institut de Recherche et Développement sur l'Energie Photovoltaïque (IRDEP), UMR 7174 CNRS-EDF-Chimie ParisTech (PSL), 6 Quai Watier, 78400 Chatou, France.
authors: B
authors: B
authors: Theys
authors: Laboratoire de Photonique et de Nanostructures (LPN), UPR 20 CNRS, Route de Nozay, 91460 Marcoussis, France.
authors: G
authors: G
authors: Patriarche
authors: Institut Photovoltaïque d'Île-de-France (IPVF), 8 Rue de la Renaissance, 92160 Antony, France.
authors: M
authors: M
authors: Jubault
authors: Institut Photovoltaïque d'Île-de-France (IPVF), 8 Rue de la Renaissance, 92160 Antony, France.
authors: F
authors: F
authors: Donsanti
authors: Institut de Recherche et Développement sur l'Energie Photovoltaïque (IRDEP), UMR 7174 CNRS-EDF-Chimie ParisTech (PSL), 6 Quai Watier, 78400 Chatou, France.
authors: J-F
authors: JF
authors: Guillemoles
authors: Institut de Recherche et Développement sur l'Energie Photovoltaïque (IRDEP), UMR 7174 CNRS-EDF-Chimie ParisTech (PSL), 6 Quai Watier, 78400 Chatou, France.
authors: D
authors: D
authors: Lincot