Zn-Se-Cd-S Interlayer Formation at the CdS/Cu2ZnSnSe4 Thin-Film Solar Cell Interface

Authors

Marcus Bär, Brandenburgische Technische Universität Cottbus-SenftenbergFollow
Ingrid Repins, National Renewable Energy Laboratory
Lothar Weinhardt, University of Nevada, Las VegasFollow
Jan H. Alsmeier, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB)
Sujitra Pookpanratana, University of Nevada, Las Vegas
Monika Blum, University of Nevada, Las VegasFollow
Wanli Yang, Lawrence Berkeley National LaboratoryFollow
Clemens Heske, University of Nevada, Las VegasFollow
Regan G. Wilks, Helmholtz-Zentrum Berlin für Materialien und Energie GmbHFollow
Rommel Noufi, National Renewable Energy Laboratory (NREL)

Document Type

Article

Publication Date

1-1-2017

Publication Title

ACS Energy Letters

Volume

2

Issue

7

First page number:

1632

Last page number:

1640

Abstract

The chemical structure of the CdS/Cu2ZnSnSe4 (CZTSe) interface was studied by a combination of electron and X-ray spectroscopies with varying surface sensitivity. We find the CdS chemical bath deposition causes a "redistribution" of elements in the proximity of the CdS/CZTSe interface. In detail, our data suggest that Zn and Se from the Zn-terminated CZTSe absorber and Cd and S from the buffer layer form a Zn-Se-Cd-S interlayer. We find direct indications for the presence of Cd-S, Cd-Se, and Cd-Se-Zn bonds at the buffer/absorber interface. Thus, we propose the formation of a mixed Cd(S,Se)-(Cd,Zn)Se interlayer. We suggest the underlying chemical mechanism is an ion exchange mediated by the amine complexes present in the chemical bath. © 2017 American Chemical Society.

Language

english

Repository Citation

Bär, M., Repins, I., Weinhardt, L., Alsmeier, J. H., Pookpanratana, S., Blum, M., Yang, W., Heske, C., Wilks, R. G., Noufi, R. (2017). Zn-Se-Cd-S Interlayer Formation at the CdS/Cu2ZnSnSe4 Thin-Film Solar Cell Interface. ACS Energy Letters, 2(7), 1632-1640.
http://dx.doi.org/10.1021/acsenergylett.7b00140