Optical modeling of compound CuInS2 using relative dielectric function approach and Boubaker polynomials expansion scheme BPES
| Autor: | Mosbah Amlouk, S. Belgacem, T. Ben Nasrallah, Karem Boubaker, N. Guezmir |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Diffraction
business.industry Chemistry Scanning electron microscope Band gap Mechanical Engineering Metals and Alloys Substrate (electronics) Microstructure chemistry.chemical_compound Optics Mechanics of Materials Ternary compound Materials Chemistry Transmittance Optoelectronics Thin film business |
| Zdroj: | Journal of Alloys and Compounds. 481:543-548 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2009.03.167 |
| Popis: | The ternary compound CuInS 2 is attractive for solar cells due to its band gap of 1.54 eV which borders the optimum value necessary for conversion of a solar spectrum. Recently, works on thin film cells based on this material (ZnO/CuInS 2 ) has been reported to show efficiency as high as 11.4%. In this paper, the orientation and the morphology of CuInS 2 sprayed films are determined by the means of X-ray diffraction and scanning electron microscopy. Sprayed CuInS 2 films deposited onto a transparent Pyrex substrate with standard fabrication parameters show a chalcopyrite structure with a preferential orientation (1 1 2). A model based on the calculation of the relative dielectric function ɛ has been performed in order to obtain the profile of variation of this parameter and to understand the optical behavior of this material via its transmittance and reflectance in visible and near-infrared regions (0.35–2.5 μm). In the same way, considering the inhomogeneous material CuInS 2 containing air inclusions and defaults in bulk as an effective medium, we explain the lack of the interference fringes in experimental spectra of R ( λ ) and T ( λ ) and estimate the density of these inclusions at about 20%. The study shows that analysis of the optical properties is a good method to assess the quality of a sprayed CuInS 2 thin film in order to use it as an absorber in photovoltaic cells. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect