Optical properties and scanning probe microscopy study of some AgAsSSe amorphous films |
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Authors: | P Knotek J Tasseva M Kincl |
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Affiliation: | a University of Pardubice, Faculty of Chemical Technology, Studentská 84, 532 10 Pardubice, Czech Republic b Central Laboratory of Photoprocesses, Bulgarian Academy of Sciences, Acad. G. Bonchev St., b.l. 109, 1113 Sofia, Bulgaria c Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry, v. v. i., Academy of Sciences of the Czech Republic and University of Pardubice, Studentská 84, 532 10 Pardubice, Czech Republic |
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Abstract: | Doping of As S Se amorphous films by silver photo-dissolution leads to a decrease of the optical gap and to an increase of the refractive index in forming Ag As S Se films. The difference of the optical gap and refractive index between undoped and doped films has been found in case of Ag15As26S29Se30 film up to 0.37 eV and 0.26, respectively. Transreflectance in far infrared spectral region indicates formation of AgAsS2 and AgAsSe2 entities in Ag15As26S29Se30 film. Scanning probe microscopy, namely atomic force microscopy, atomic force acoustic microscopy (AFAM) and Kelvin probe force microscopy (KPFM) was used for studying Ag As S Se films. It was found that silver growth is rather three dimensional and it is reminiscent of the Stranski-Krastanov growth mode. Observed silver protuberances represent silver reservoirs responsible for a local increase of silver content. Hence, the silver growth mode enhances formation of nano/meso inhomogeneities of the surface and near surface density/stiffness, seen in AFAM, and in the surface electric potential, seen in KPFM. |
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Keywords: | Amorphous materials Atomic force microscopy (AFM) Optical properties Silver photodissolution |
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