Signatures de la compétition des transitions polaire et distortive du titanate de strontium

MONTPELLIER-BU Sciences (341722106) / SudocTOULON-BU Centrale (830622101) / SudocSudocFranceF

Improved CuGaSe2 absorber properties through a modified co-evaporation process

International audienc

Coevaporated KInSe 2 : A Fast Alternative to KF Postdeposition Treatment in High-Efficiency Cu(In,Ga)Se 2 Thin Film Solar Cells

International audienc

KF post deposition treatment in co-evaporated Cu(In,Ga)Se 2 thin film solar cells: Beneficial or detrimental effect induced by the absorber characteristics

International audienc

Minimizing metastabilities in Cu(In,Ga)Se 2 /(CBD)Zn(S,O,OH)/i-ZnO-based solar cells

International audienc

17.2% efficiency CuIn 1− x Ga x Se 2 thin-film based mini-module thanks to alternative architecture yielding 81% fill factor

International audienceAn alternative to conventional Cu(In,Ga)Se2 module structure is proposed and experimentally investigated. This alternative module structure, which consists in applying metallic buses to connect monolithically adjacent cells in series, is likely to offer the opportunity of minimizing both optical and electrical losses observed in conventional module structure compared to small area cells. The fabrication process of such alternative modules is presented. The performances achieved are discussed in comparison with a standard small-area-cell elaborated simultaneously. Despite slightly lower output voltage per cell, the alternative module structure demonstrates an efficiency of 17.2% (with 81% fill factor), against 16.4% (with 75% fill factor) for the standard cell. This promising result opens new routes to decrease the gap observed between small-area-cells and industrial modules

Influence of indium/gallium gradients on the Cu(In,Ga)Se2 devices deposited by the co-evaporation without recrystallisation

International audienc

Alternative alkali fluoride post‐deposition treatment under elemental sulfur atmosphere for high‐efficiency Cu(In,Ga)Se 2 ‐based solar cells

International audienceUp to now, what we know about the impact of alkali post-deposition treatment (PDT) on Cu(In,Ga)Se-2 (CIGSe) absorber thin films is largely based on treatments performed in selenium atmosphere and only few studies have addressed the critical role of the chalcogen atmosphere during the PDT. The present study deals with an innovative process of alkali fluoride PDT under elemental sulfur atmosphere on co-evaporated Cu(In,Ga)Se-2 absorbers. With the aim to understand the effects of different the incorporated alkali element incorporated during the PDT, we investigate four different PDTs: CsF, NaF/RbF, RbF, and In + RbF-all under sulfur atmosphere. The treated absorbers are characterized by scanning electron microscopy, Raman spectroscopy, and photoluminescence spectroscopy. Our results show that for CIGSe compositions close to stoichiometry, forming a slightly Cu-poor CIGSe at the surface during the PDT is beneficial. Cu(In,Ga)Se-2/RbF(S) and Cu(In,Ga)Se-2/In + RbF(S) exhibit the higher photoluminescence response probably due to decreased surface recombination. The quasi-Fermi-level splitting is in good agreement with the observed V-oc difference between the treated and reference samples. The electronic properties of the Cu(In,Ga)Se-2/In + RbF(S)-based solar cells show a significantly improved performance with high V-oc and FF

Facile enhancement of bulk heterojunction solar cells performance by utilizing PbSe nanorods decorated with graphene

International audienc

Atom probe study of Cu-poor to Cu-rich transition during Cu(In,Ga)Se-2 growth

International audienceAtomic scale chemistry of polycrystalline Cu(In,Ga)Se2 (CIGSe) thin film has been characterized at key points of the 3-stage process using atom probe tomography. 3D atom distributions have been reconstructed when the layer is Cu-poor ([Cu]/([Ga] + [In])  1), and at the end of the process. Particular attention has been devoted to grain boundary composition and Na atomic distribution within the CIGSe layer. Significant variation of composition is highlighted during the growing process, providing fundamental information helping the understanding of high efficiency CIGSe formation