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Title: Zn–Se–Cd–S Interlayer Formation at the CdS/Cu 2 ZnSnSe 4 Thin-Film Solar Cell Interface

The chemical structure of the CdS/Cu 2ZnSnSe 4 (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. Here, 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 also suggest the underlying chemical mechanism is an ion exchange mediated by the amine complexes present in the chemical bath.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [5] ;  [6] ;  [3] ;  [1] ;  [2]
  1. Helmholtz Association of German Research Centres (HZB), Berlin (Germany). Renewable Energy
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Karlsruhe Inst. of Technology (KIT) (Germany). Inst. for Photon Science and Synchrotron Radiation (IPS), Inst. for Chemical Technology and Polymer Chemistry (ITCP); Univ. of Nevada, Las Vegas, NV (United States). Dept. of Chemistry and Biochemistry
  4. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Chemistry and Biochemistry; National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Engineering Physics Division
  5. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Chemistry and Biochemistry
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
Report Number(s):
NREL/JA-5J00-69109
Journal ID: ISSN 2380-8195
Grant/Contract Number:
AC36-08GO28308; AC02-05CH11231
Type:
Published Article
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 2; Journal Issue: 7; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; absorbers; buffer layers; interlayers; chemical structure
OSTI Identifier:
1374462
Alternate Identifier(s):
OSTI ID: 1390772; OSTI ID: 1426731