id,collection,dc.contributor.author,dc.date.accessioned,dc.date.available,dc.date.issued,dc.description.abstract[en],dc.format.extent,dc.identifier.uri,dc.language,dc.rights.uri,dc.subject.ddc,dc.subject[en],dc.title,dc.type,dcterms.accessRights.openaire,dcterms.bibliographicCitation.articlenumber,dcterms.bibliographicCitation.doi,dcterms.bibliographicCitation.journaltitle,dcterms.bibliographicCitation.url,dcterms.bibliographicCitation.volume,dcterms.isPartOf.issn,refubium.affiliation,refubium.affiliation.other,refubium.resourceType.isindependentpub,refubium.resourceType.provider "1c9d5425-007b-4026-a31c-50255371fb72","fub188/16","Ruiz-Perona, Andrea||Gurieva, Galina||Sun, Michael||Kodalle, Tim||Sánchez, Yudania||Grossberg, Maarja||Manuel Merino, José||Schorr, Susan||León, Máximo||Caballero, Raquel","2021-05-20T09:13:30Z","2021-05-20T09:13:30Z","2021","Wide band-gap kesterite-based solar cells are very attractive to be used for tandem devices as well as for semi-transparent photovoltaic cells. Here, Cu2ZnGe(S,Se)4 (CZGSSe) thin films have been grown by sulfurization of co-evaporated Cu2ZnGeSe4. The influence of a NaF precursor layer and of a Se capping film on CZGSSe absorbers and solar cells has been investigated. It has been found that the distribution of [S]/([S]+[Se]) through the CZGSSe absorber layer is strongly dependent on the Na content. Na promotes the diffusion of S towards the bulk of the absorber layer. Thicker NaF layers>6 nm lead to a higher S content in the bulk of the absorber layer, but to a decreased accumulation of sulphur at the surface, as detected by GIXRD, GD-OES, and Raman spectroscopy measurements. A relationship between Jsc, FF and Na-content supplied was found; higher Na content resulted in improved solar cell efficiencies. It has also been possible to modify the [S]/([S]+[Se])-gradient throughout the CZGSSe film by the absence of the Se capping layer, achieving devices with 2.7% performance and Eg = 2.0 eV. This work reveals two ways to control the [S]/([S]+[Se]) depth-profile to produce wide band gap CZGSSe absorber layers for efficient solar cells.","9 Seiten","https://refubium.fu-berlin.de/handle/fub188/30829||http://dx.doi.org/10.17169/refubium-30568","eng","https://creativecommons.org/licenses/by-nc-nd/4.0/","500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften","Kesterite||Solar cells||Sodium||Selenium capping layer||Sulphur-gradient||Wide band gap energy","Routes to develop a [S]/([S]+[Se]) gradient in wide band-gap Cu2ZnGe(S,Se)4 thin-film solar cells","Wissenschaftlicher Artikel","open access","159253","10.1016/j.jallcom.2021.159253","Journal of Alloys and Compounds","https://doi.org/10.1016/j.jallcom.2021.159253","868","0925-8388","Geowissenschaften","Institut für Geologische Wissenschaften / Fachrichtung Geochemie, Hydrogeologie, Mineralogie:::1c5426db-34b8-4a04-be1f-133f049152ac:::600","no","WoS-Alert"