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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/27701

Title: Fabrication of high band gap kesterite solar cell absorber materials for tandem applications
Authors: Kohl, Thierry
Brammertz, G.
de Wild, Jessica
Neuwirth, M.
Meuris, Marc
Poortmans, Jef
Vermang, Bart
Issue Date: 2018
Publisher: ELSEVIER SCIENCE SA
Citation: THIN SOLID FILMS, 660, p. 247-252
Abstract: Using the thermal annealing of evaporated metallic precursors in successive H2Se and H2S atmospheres, it was possible to reproducibly manufacture kesterite absorber material for solar cell applications with a sulfur content varying from 30% to 100%. Respective band gaps for these sulfur inclusions were measured at approximately 1.45 eV and 2.0 eV. A recipe was devised for which results could be reproduced within an error margin of +/- 5% and the influence of the H2S pressure during the post sulfurization was negligible on all measurable and observable parameters. The evolution of the S/Se ratio in the sample was observed to be linearly dependent on the annealing time. It was also observed that at very early stages of the post-sulfurization, both the original Cu-2(Zn,Ge)Se-4 (CZGSe) and a primary Cu-2(Zn,Ge)(S,Se)(4) (CZGSSe) phase with a sulfur inclusion of similar to 30% coexist in the sample. The (112) x-ray diffraction (XRD) reflection of the CZGSe phase progressively disappears in favor for the first mixed CZGSSe phase. Using grazing incidence-XRD, the S/Se ratio was shown to be in homogeneous. Indeed, the XRD measurement of the top layers led to the calculation of higher sulfur inclusions than was the case when measuring the bulk material. Top-scanning electron microscopy (SEM) as well as cross-SEM measurements were taken in order to determine the impact of the sulfur inclusion on the crystal growth and the overall quality of the produced absorber layers. The obtained images revealed a reduction in crystal size and the appearance of numerous holes in the layer as the S/Se ratio is increased.
Notes: [Kohl, Thierry; Brammertz, G.; de Wild, J.; Meuris, M.; Poortmans, J.; Vermang, B.] Hasselt Univ, Inst Mat Res IMO, Solliance & Energy Ville, Agoralaan Gebouw H, B-3590 Diepenbeek, Belgium. [Kohl, Thierry; Brammertz, G.; de Wild, J.; Meuris, M.; Vermang, B.] Imec, Div IMOMEC, Solliance & EnergyVille, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. [Poortmans, J.] Imec, Solliance & Energy Ville, Kapeldreef 75, B-3001 Leuven, Belgium. [Neuwirth, M.] Karlsruhe Inst Technol, Inst Appl Phys, Wolfgang Gaede Str 1, D-76131 Karlsruhe, Germany. [Poortmans, J.] Katholieke Univ Leuven, Dept Elect Engn, Kasteelpk Arenberg 10, B-3001 Heverlee, Belgium.
URI: http://hdl.handle.net/1942/27701
DOI: 10.1016/j.tsf.2018.06.038
ISI #: 000441177500030
ISSN: 0040-6090
Category: A1
Type: Journal Contribution
Appears in Collections: Research publications

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