Reference : Quantification of surface ZnSe in Cu2ZnSnSe4-based solar cells by analysis of the spe...

	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Multidisciplinary, general & others
	To cite this reference:	http://hdl.handle.net/10993/16053

Title :	Quantification of surface ZnSe in Cu2ZnSnSe4-based solar cells by analysis of the spectral response
Language :	English
Author, co-author :	Colombara, Diego [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Robert, Erika [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Crossay, Alexandre [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Taylor, Aidan [Durham University > Department of Physics]
	Guennou, Mael [Centre de Recherche Public Gabriel Lippmann - Luxembourg > Département Science et Analyse des Matériaux]
	Arasimowicz, Monika [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Malaquias, Joao Corujo Branco [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Djemour, Rabie [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Dale, Phillip [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Publication date :	Apr-2014
Journal title :	Solar Energy Materials and Solar Cells
Publisher :	Elsevier Science
Volume :	123
Pages :	220-227
Peer reviewed :	Yes (verified by ORBilu)
Audience :	International
ISSN :	0927-0248
City :	Amsterdam
Country :	The Netherlands
Keywords :	[en] Kesterite ; Electrodeposition ; ZnSe secondary phase ; Short circuit current density ; Photocurrent spectroscopy ; EQE
Abstract :	[en] Absorber layers consisting of Cu2ZnSnSe4 (CZTSe) and surface ZnSe in variable ratios were prepared by selenization of electroplated Cu/Sn/Zn precursors and completed into full devices with up to 5.6 % power conversion efficiency. The loss of short circuit current density for samples with increasing ZnSe content is consistent with an overall reduction of spectral response, pointing to a ZnSe current blocking behavior. A feature in the spectral response centered around 3 eV was identified and attributed to light absorption by ZnSe. A model is proposed to account for additional collection of the carriers generated underneath ZnSe capable of diffusing across to the space charge region. The model satisfactorily reproduces the shape of the spectral response and the estimated ZnSe surface coverage is in good qualitative agreement with analysis of the Raman spectral mapping. The model emphasizes the importance of the ZnSe morphology on the spectral response, and its consequences on the solar cell device performance.
Funders :	European Commission - EC
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/10993/16053
DOI :	10.1016/j.solmat.2014.01.015
Other URL :	http://www.sciencedirect.com/science/article/pii/S092702481400021X
Framework Programme / European Project :	FP7 ; 284486 - SCALENANO - Development and scale-up of nanostructured based materials and processes for low cost high efficiency chalcogenide based photovoltaics

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