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Intermixing at the InxSy/Cu2ZnSn(S,Se)4 Heterojunction and Its Impact on the Chemical and Electronic Interface Structure

Journal Article · · ACS Applied Energy Materials
 [1];  [2];  [3];  [3];  [3];  [2];  [4];  [5];  [3];  [1];  [1]
  1. Karlsruhe Inst. of Technology (KIT) (Germany); Univ. of Nevada, Las Vegas, NV (United States)
  2. Univ. of Nevada, Las Vegas, NV (United States)
  3. Center for Solar Energy and Hydrogen Research Baden-Württemberg. Stuttgart (Germany)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Univ. of Nevada, Las Vegas, NV (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
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We report on the chemical and electronic structure of the interface between a thermally co-evaporated InxSy buffer and a Cu2ZnSn(S,Se)4 (CZTSSe) absorber for thin-film solar cells. To date, such cells have achieved energy conversion efficiencies up to 8.6%. Using surface-sensitive X-ray and UV photoelectron spectroscopy, combined with inverse photoemission and bulk-sensitive soft X-ray emission spectroscopy, we find a complex character of the buffer layer. It includes oxygen, as well as selenium and copper that diffused from the absorber into the InxSy buffer, exhibits an electronic band gap of 2.50 ± 0.18 eV at the surface, and leads to a small cliff in the conduction band alignment at the InxSy/CZTSSe interface. After an efficiency-increasing annealing step at 180 °C in nitrogen atmosphere, additional selenium diffusion leads to a reduced band gap at the buffer layer surface (2.28 ± 0.18 eV).
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1594922
Journal Information:
ACS Applied Energy Materials, Journal Name: ACS Applied Energy Materials Journal Issue: 6 Vol. 2; ISSN 2574-0962
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Absorption
Annealing (metallurgy)
Band Alignment
Electronic Structure
Indium Sulfide
Interfaces
Inverse Photoemission Spectroscopy
Kesterite
Layers
Photoelectron Spectroscopy
Thickness
Thin-Film Solar Cell
X-ray Emission Spectroscopy