期刊
THIN SOLID FILMS
卷 669, 期 -, 页码 600-604出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2018.11.038
关键词
Photoconductivity; Copper indium gallium selenide; Thin films; Defects; Metastability
类别
资金
- Beethoven II project AlkaCIGS [2016/23/G/ST5/04268]
Persistent photoconductivity (PPC) in thin Cu(In,Ga)Se-2 films is discussed within a model of relaxing defects acting as donors or acceptors depending on their configurational and charge state. The aim of this work is to identify the factors related to technological processes which affect the magnitude of PPC. We established a method of evaluation of the concentration of metastable defects in thin Cu(In,Ga)Se-2 films relating it to the position of the Fermi level in thermodynamic equilibrium and used it to compare and discuss the impact of preparation details on the PPC value. The main result is that deviation from Cu/(Ga + In) stoichiometry does not change the concentration of metastable defects. Post deposition annealing in selenium affects the PPC depending on the presence of sodium during the treatment, while the impact of sodium itself on the metastable defect concentration apparently depends on whether it is present during the Cu(In,Ga)Se-2 deposition process or whether it is supplied during post-deposition treatment.
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