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Title: | Study of Ammonium Sulfide Surface Treatment for Ultrathin Cu(In,Ga)Se(2)with Different Cu/(Ga plus In) Ratios | Authors: | BULDU KOHL, Dilara DE WILD, Jessica KOHL, Thierry BRAMMERTZ, Guy BIRANT, Gizem MEURIS, Marc POORTMANS, Jef VERMANG, Bart |
Issue Date: | 2020 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 217 (19) (Art N° 2000307) | Abstract: | In ultrathin Cu(In,Ga)Se-2(CIGS) film solar cells, the CdS/CIGS interface may become one of the limiting factors for efficiency. The first step toward reducing the impact of this problem could be a surface treatment process to improve the quality of the front interface. The purpose of this study is to have a better understanding of the effect of wet chemical surface treatment, using ammonium sulfide ((NH4)(2)S), on CIGS thin film layers with different Cu/(Ga + In) (CGI) ratios. Herein, photoluminescence (PL) and time-resolved PL (TRPL) studies are conducted on bare CIGS, ammonium sulfide-treated CIGS thin films, and samples with CdS. In bare CIGS, CGI ratio-dependent changes in PL are observed on both a low-energy (defect related transition) and a high-energy peak (band-to-band transition). After the surface treatment, the PL maximum increases by factors ranging from 4 to 11 depending on the CGI ratio, accompanied by a slower decay. Trends with similar improvement as in the PL study are observed in the performance of the solar cells. It is shown that the impact of the surface treatment is beneficial independently of the CGI ratio of the absorber layers. In all cases, the treatment is shown to improve the efficiency. | Notes: | Buldu, DG (corresponding author), Hasselt Univ Partner Solliance, Inst Mat Res IMO, Agoralaan Gebouw H, B-3590 Diepenbeek, Belgium.; Buldu, DG (corresponding author), Imec Div IMOMEC Partner Solliance, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.; Buldu, DG (corresponding author), EnergyVille, Thorpk,Poort Genk 8310 & 8320, B-3600 Genk, Belgium. Dilara.Gokcen.Buldu@imec.be |
Other: | Buldu, DG (corresponding author), Hasselt Univ Partner Solliance, Inst Mat Res IMO, Agoralaan Gebouw H, B-3590 Diepenbeek, Belgium ; Imec Div IMOMEC Partner Solliance, Wetenschapspk 1, B-3590 Diepenbeek, Belgium ; EnergyVille, Thorpk,Poort Genk 8310 & 8320, B-3600 Genk, Belgium. Dilara.Gokcen.Buldu@imec.be | Keywords: | Cu;(Ga plus In) ratio;Cu(In;Ga)Se-2;photoluminescence;solar cells;surface treatment;thin film photovoltaics | Document URI: | http://hdl.handle.net/1942/32930 | ISSN: | 1862-6300 | e-ISSN: | 1862-6319 | DOI: | 10.1002/pssa.202000307 | ISI #: | WOS:000562998200001 | Rights: | 2020 Wiley-VCH GmbH. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2021 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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BulduDilara_2020.pdf Restricted Access | Published version | 1.91 MB | Adobe PDF | View/Open Request a copy |
pss-a-2020-DBG.pdf | Peer-reviewed author version | 447.96 kB | Adobe PDF | View/Open |
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