Optical properties of Cu2ZnSn(SxSe1-x)(4) solar absorbers: Spectroscopic ellipsometry and ab initio calculations

Optical properties of Cu2ZnSn(SxSe1-x)(4) solar absorbers : Spectroscopic ellipsometry and ab initio calculations

QC 20170306
Dielectric functions of Cu2ZnSn(SxSe1-x)(4) thin film absorbers with varied x were determined by spectroscopic ellipsometry and ab initio calculations. From the combination of experimental and theoretical studies, the fundamental interband transition energy E-0 (similar to 1-1.5 eV) and the next following transition energy E-1 (similar to 2-3 eV) were identified and found to blue-shift with increasing sulfur anion content, while keeping the energy separation E-1 - E-0 almost constant, similar to 1.4 eV from experiments, and 1 eV from theory. In addition, the average dielectric responses were found to decrease with sulfur anion content from both theoretical and experimental results. The Tauc optical bandgap value E-g determined on samples prepared on Mo and soda lime glass substrate showed a positive linear relationship between x and bandgap E-g. The bandgap bowing factor determined from the theoretical data is 0.09 eV. (C) 2017 Author(s).

Zamulko, SergiyUniv Oslo, Dept Phys, Ctr Mat Sci & Nanotechnol, NO-0316 Oslo, Norway. (författare)
Persson, ClasKTH,Materialvetenskap,Univ Oslo, Norway(Swepub:kth)u16hf74r (författare)
Ross, NilsUppsala universitet,Fasta tillståndets elektronik,Univ Oslo, Dept Phys, Ctr Mat Sci & Nanotechnol, NO-0316 Oslo, Norway.(Swepub:uu)nilro891 (författare)
Larsen, Jes K.Uppsala universitet,Fasta tillståndets elektronik(Swepub:uu)jenla503 (författare)
Platzer-Björkman, CharlotteUppsala universitet,Fasta tillståndets elektronik(Swepub:uu)chpla516 (författare)
Uppsala universitetFasta tillståndets elektronik (creator_code:org_t)

Av författaren/redakt...: Li, Shu-Yi; Zamulko, Sergiy; Persson, Clas; Ross, Nils; Larsen, Jes K.; Platzer-Björkman ...

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