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Title: | Challenge in Cu-rich CuInSe2 thin film solar cells: Defect caused by etching | Authors: | Elanzeery, Hossam Melchiorre, Michele Sood, Mohit Babbe, Finn Werner, Florian BRAMMERTZ, Guy Siebentritt, Susanne |
Issue Date: | 2019 | Publisher: | AMER PHYSICAL SOC | Source: | PHYSICAL REVIEW MATERIALS, 3(5) (Art N° 055403) | Abstract: | Thin-film solar cells consist of several layers. The interfaces between these layers can provide critical recombination paths and consequently play a vital role in the efficiency of the solar cell. One of the main challenges for polycrystalline semiconductor absorber materials is the absorber-buffer interface. The Cu(In, Ga)Se-2 system is particularly interesting in this context, since Cu-rich absorbers are dominated by recombination at the interface, while Cu-poor ones are not. This paper unveils the root cause of the challenge in the interface of Cu-rich solar cells in terms of a Se-related defect with an activation energy of 200 +/- 20 meV. This defect causes interface recombination and is responsible for the deficiency of open-circuit voltage in Cu-rich cells. Moreover, this paper demonstrates that the origin of this defect is due to the etching step necessary to remove secondary phases. Postdeposition surface treatments or modified buffer layers are shown to passivate this defect, to reduce interface recombination, and to increase the efficiency. | Notes: | [Elanzeery, Hossam; Melchiorre, Michele; Sood, Mohit; Babbe, Finn; Werner, Florian; Siebentritt, Susanne] Univ Luxembourg, Lab Photovolta, Phys & Mat Sci Res Unit, L-4422 Belvaux, Luxembourg. [Brammertz, Guy] Partner Solliance, Imec Div IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. [Brammertz, Guy] Hasselt Univ, Inst Mat Res IMO, Partner Solliance, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. | Keywords: | Materials Science, Multidisciplinary | Document URI: | http://hdl.handle.net/1942/30003 | ISSN: | 2475-9953 | e-ISSN: | 2475-9953 | DOI: | 10.1103/PhysRevMaterials.3.055403 | ISI #: | 000468237900003 | Rights: | 2019 American Physical Society | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
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elanzeery 1.pdf Restricted Access | Published version | 2.8 MB | Adobe PDF | View/Open Request a copy |
Manuscript.pdf | Peer-reviewed author version | 1.43 MB | Adobe PDF | View/Open |
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