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Title: | A study of bandgap-graded CZTGSe kesterite thin films for solar cell applications | Authors: | SCAFFIDI, Romain BRAMMERTZ, Guy Wang, Yibing Zaman, Arman Uz Sasikumar, Keerthi DE WILD, Jessica Flandre, Denis VERMANG, Bart |
Issue Date: | 2023 | Publisher: | ROYAL SOC CHEMISTRY | Source: | Energy Advances, 2 (10) , p. 1626 -1633 | Abstract: | Cu 2 ZnSn(S,Se) 4 kesterite materials are a sustainable and harmless alternative to conventional Cu(In,Ga)Se 2 (CIGS) and CdTe absorbers for thin-film photovoltaics but are still lacking efficiency. This study presents the realization of bandgap grading in Cu 2 Zn(Sn 1Àx Ge x)Se 4 (CZTGSe) kesterite thin films via the incorporation of Ge to partly substitute Sn, and their mutual segregation along the absorber profile. Bandgap values at the front and rear interfaces are, respectively, estimated to be around 1.10 eV and 1.38 eV, based on the Ge-Sn ratio. The kesterite deposition relies on a sequential process involving evaporating metallic precursors then annealing in Se vapour with an optimized temperature profile to favour crystallization and growth of micron-size grains. Further work is needed to solve the problem of the limited open-circuit voltage (V oc) and fill factor of in-house devices. However, the Ge-alloying method proposed in this work to obtain a continuous increase of the kesterite absorber bandgap towards its bottom surface could be applied to possibly enhance the performance of other kesterite solar cells. | Notes: | Scaffidi, R (corresponding author), Hasselt Univ, IMO, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.; Scaffidi, R (corresponding author), IMOMEC, imec, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.; Scaffidi, R (corresponding author), EnergyVille 2, Thor Pk 8320, B-3600 Genk, Belgium.; Scaffidi, R (corresponding author), UCLouvain, ICTEAM, Pl Levant 3-L5 03-02, B-1348 Louvain La Neuve, Belgium. romain.scaffidi@imec.be |
Document URI: | http://hdl.handle.net/1942/41564 | ISSN: | 2753-1457 | DOI: | 10.1039/D3YA00359K | ISI #: | 001102157100001 | Rights: | 2023 The Author(s). Published by the Royal Society of Chemistry. Open Access Article. Published on 10 August 2023. Downloaded on 10/17/2023 3:29:50 PM. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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d3ya00359k.pdf | Published version | 1.42 MB | Adobe PDF | View/Open |
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