Cu(In,Ga)(Se,Te)(2) pentenary thin films formed by reaction of precursor layers

Atasoy, Y.
Basol, B. M.
Parlak, Mehmet
Sodium doped CuIn(1 - x) Ga-x(Se(1 - y) Te-y)(2) (CIGST) thin films were grown on Mo-coated soda lime glass substrates by a two-stage technique. The effects of Te content and annealing temperature on the microstructural characteristics and phase segregation in CIGST thin films were studied. It was observed that presence of Ga in these films affected the kinetics of the reaction and phase formation and largely eliminated the separation of the Te-rich phase towards the Mo surface, which was previously observed under the two-stage processing conditions in films containing only Cu, In, Se and Te. Microprobe measurements showed that the smaller grain material visible through the gaps within the larger grain material had higher Ga and Se content compared to larger grains, which were richer in Te and In. For CIGS film formation, an annealing regime that involved a low temperature partial reaction step followed by a high temperature reaction step yielded better films compared to a process with a single high temperature step. However, for films containing both Se and Te, the two temperature processing approach caused excessive phase separation.


Sol-Gel processing of organically modified ITO thin films and characterization of their optoelectronic and microstructural properties
Kesim, Mehmet Tümerkan; Durucan, Caner; Department of Metallurgical and Materials Engineering (2012)
Indium tin oxide (ITO) thin films were formed on glass substrates by sol-gel method. Coating sols were prepared using indium chloride tetrahydrate (InCl3•4H2O) and tin-chloride pentahydrate (SnCl4•5H2O) stabilized in organic solvents (acetylacetone and ethanol). First attempt was to synthesize ITO thin films using standard/unmodified coating sols. The effect of calcination treatment in air (300 – 600 °C) and number of coating layer(s) (1, 4, 7 or 10) on optoelectronic properties (electrical conductivity and...
Sol-gel synthesis of antibacterial silver-doped silica powders from sodium silicate (water glass)
Tufan, Evrim Özdem; Durucan, Caner; Department of Metallurgical and Materials Engineering (2013)
Sol-gel processing routes for the synthesis of antibacterial silver-doped silica (Ag-SiO2) powders from an inorganic precursor, sodium silicate (Na2SiO3, water glass), have been established. For the synthesis of SiO2 powders, two different processing approaches were used. In the first one (indirect synthesis), silver ions were incorporated into the immature wet silica gels obtained from sodium silicate by the exposure of the silica gels to aqueous silver nitrate (AgNO3) solutions. In the second one, silver ...
Au/TiO2 nanorod-based Schottky-type UV photodetectors
Karaagac, Hakan; Aygun, Levent Erdal; Parlak, Mehmet; Ghaffari, Mohammad; Biyikli, Necmi; Okyay, Ali Kemal (2012-11-01)
TiO2 nanorods (NRs) were synthesized on fluorine-doped tin oxide (FTO) pre-coated glass substrates using hydrothermal growth technique. Scanning electron microscopy studies have revealed the formation of vertically-aligned TiO2 NRs with length of similar to 2 mu m and diameter of 110128 nm, homogenously distributed over the substrate surface. 130 nm thick Au contacts using thermal evaporation were deposited on the n-type TiO2 NRs at room temperature for the fabrication of NR-based Schottky-type UV photodete...
Defect-induced room temperature ferromagnetism in B-doped ZnO
Yilmaz, S.; Nisar, J.; Atasoy, Y.; McGlynn, E.; Ahuja, R.; Parlak, Mehmet; BACAKSIZ, EMİN (2013-05-01)
ZnO microrods were grown on glass substrates by the spray pyrolysis method and boron was doped into the ZnO microrods by diffusion. X-ray diffraction results confirmed that the incorporation of B leads to a slight reduction in the deposit texture. Scanning electron microscopy measurements showed that the morphology of the ZnO samples changed from a microrod to nanocrystalline structure with B-doping. Photoluminescence data indicate that B-doping leads to a relative increase of the unstructured green band in...
Substrate consumption rates for hydrogen production by Rhodobacter sphaeroides in a column photobioreactor
Eroglu, I; Aslan, K; Gündüz, Ufuk; Yucel, M; Turker, L (1999-04-30)
The effect of L-malic acid and sodium glutamate, which serve as the carbon and nitrogen source, respectively, on hydrogen production by Rhodobacter sphaeroides O.U.001 has been investigated in a batch water jacketed glass column photobioreactor (PBR), which has an inner volume of 400 ml. The PER was operated at different carbon to nitrogen ratios at 32 degrees C with a tungsten lamp at a light intensity of 200 W m(-2). Carbon to nitrogen ratio was found to be an important parameter for bio-hydrogen producti...
Citation Formats
Y. Atasoy, B. M. Basol, İ. POLAT, M. TOMAKİN, M. Parlak, and E. BACAKSIZ, “Cu(In,Ga)(Se,Te)(2) pentenary thin films formed by reaction of precursor layers,” THIN SOLID FILMS, pp. 189–194, 2015, Accessed: 00, 2020. [Online]. Available: