Bibliographic Details
| Title: |
Structural and optical properties of (Ag,Cu)(In,Ga)Se2 polycrystalline thin film alloys. |
| Authors: |
Boyle, J. H., McCandless, B. E., Shafarman, W. N., Birkmire, R. W. |
| Superior Title: |
Journal of Applied Physics; 2014, Vol. 115 Issue 22, p223504-1-223504-8, 8p, 1 Diagram, 4 Charts, 6 Graphs |
| Subject Terms: |
ALLOYS, THIN films, MOLYBDENUM, CHALCOPYRITE, LATTICE constants, ELECTRONEGATIVITY |
| Abstract: |
The structural and optical properties of pentenary alloy (Ag,Cu)(In,Ga)Se2 polycrystalline thin films were characterized over the entire compositional range at a fixed (Cu+Ag)/(In+Ga) ratio. Films deposited at 550 °C on bare and molybdenum coated soda lime glass by elemental co-evaporation in a single-stage process with constant incident fluxes exhibit single phase chalcopyrite structure, corresponding to 122 spacegroup (I-42d) over the entire compositional space. Unit cell refinement of the diffraction patterns show that increasing Ag substitution for Cu, the refined ao lattice constant, (Ag,Cu)-Se bond length, and anion displacement increase in accordance with the theoretical model proposed by Jaffe, Wei, and Zunger. However, the refined ao lattice constant and (In,Ga)-Se bond length deviated from theoretical expectations for films with mid-range Ag and Ga compositions and are attributed to influences from crystallographic bond chain ordering or cation electronegativity. The optical band gap, derived from transmission and reflection measurements, widened with increasing Ag and Ga content, due to influences from anion displacement and cation electronegativity, as expected from theoretical considerations for pseudo-binary chalcopyrite compounds. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Applied Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| Database: |
Complementary Index |
