Journal
ACS ENERGY LETTERS
Volume 2, Issue 7, Pages 1632-1640Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00140
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Funding
- Impuls- and Vernetzungsfonds of the Helmholtz Association [VH-NG-423]
- European Union's Horizon 2020 research and innovation program [640868]
- Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
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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.
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