| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1666206 | Thin Solid Films | 2013 | 4 Pages |
The application of impedance spectroscopy (IS) analytical theory to the characterization of Cu(In,Ga)Se2 (CIGS)-based solar cells was investigated. The equivalent circuit of the CIGS solar cell consisting of series and parallel resistances and a “capacitance-like element” labeled as constant phase element (CPE) around the CdS/CIGS interface was developed. The CPE reflects the depletion layer thickness and the pn interface uniformity and quality. In particular, the CPE-p value, which is an index of impedance of CPE, affects the quality around the CdS/CIGS interface in terms of defect existence and inhomogeneity of the heterojunction. These results show possible candidate for the practical application of IS as a simple method for characterizing the heterogeneity of a pn interface.
► We apply impedance spectroscopy (IS) theory for Cu(In,Ga)Se2 (CIGS) solar cells. ► We proposed the equivalent circuit of CIGS solar cells for IS analysis. ► Some parameter represented the quality around the CdS/CIGS interface. ► IS is a promising tool for direct observation of electrical properties easily.
