Browsing by Author "Tomakin, Murat"
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A atudy on hydrothermal grown CdS nanospheres: effects of Cd/S molar ratio
The study reports the influences of altering of Cd/S molar ratio on some physical properties of hydrothermal grown CdS nanospheres. Cd/S molar ratios were chosen as 1:0.5, 1:1, 1:2, 1:3 and 1:4 in the stock solution. X-ray ... -
Cold substrate method to prepare plasmonic Ag nanoparticle: deposition, characterization, application in solar cell
Nevruzoglu, Vagif; Bal Altuntas, Derya; Tomakin, Murat (Springer Heidelberg, 2020)In this study, the surface plasmon effects of the Ag nanoparticle were investigated depending on the substrate temperature and coating time. Deposition procedure for the Ag coating was the vacuum deposition at low substrate ... -
Comparative studies of CdS, CdS:Al, CdS:Na and CdS:(Al-Na) thin films prepared by spray pyrolysis
Yılmaz, Sevil Savaşkan; Atasoy, Yıldız; Tomakin, Murat; Bacaksız, Emin (Academic Press Ltd- Elsevier Science Ltd, 2015)In the present study, the spray pyrolysis technique was used to prepare pure CdS, 4 at.% Al-doped CdS, 4 at.% Na-doped CdS and (4 at.% Al, 4 at.% Na)-co-doped CdS thin films. It was found from X-ray diffraction data that ... -
Controllable growth and characterization of highly aligned ZnO nanocolumnar thin films
Onuk, Zuhal; Rujisamphan, Nopporn; Murray, Roy; Bah, Mohamed; Tomakin, Murat; Shah, S. Ismat (Elsevier, 2017)We investigated the effects of growth conditions during magnetron sputtering on the structural, morphological, and optical properties of nanostructured ZnO thin films. Undoped ZnO thin films are deposited onto p-type Si ... -
Cu(In,Ga)(Se,Te)(2) pentenary thin films formed by reaction of precursor layers
Atasoy, Yıldız; Başol, Bülent M.; Polat, İsmail; Tomakin, Murat; Parlak, Mehmet; Bacaksız, Emin (Elsevier Science Sa, 2015)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 ... -
Effect of Cd$CI_2$/annealing on the crystalline transformation of CdTe thin films grown by evaporation at a low substrate temperature
The structural and optical properties of CdTe thin films prepared at a low substrate temperature were investigated before and after the Cd$CI _2$ /annealing. The crystal structure of CdTe film was cubic with a strong (111) ... -
Effects of Na doping on CdS thin films and n-CdS/p-Si solar cells via chemical bath deposition method
Nevruzoglu, Vagif; Tomakin, Murat; Keskenler, Eyup Fahri; Ozturk, Gokturk (Korean Assoc Crystal Growth, Inc, 2017)Un-doped and Na doped CdS thin films were deposited by chemical bath deposition method. the effects of Na doping on structural, optical and electrical properties of CdS thin films and n-CdS/p-Si heterojunction were ... -
Effects of ultraviolet light on B-doped CdS thin films prepared by spray pyrolysis method using perfume atomizer
Novruzov, V. D.; Keskenler, Eyüp Fahri; Tomakin, Murat; Kahraman, Süleyman; Görür, Osman (Elsevier Science Bv, 2013)Boron doped CdS thin films were deposited by spray pyrolysis method using perfume atomizer. the effects of ultraviolet light on the structural, optical and electrical properties of B-doped CdS thin films were investigated ... -
Enhanced efficiency of CdS/P3HT hybrid solar cells via interfacial modification
Yilmaz, Salih; Polat, Ismail; Tomakin, Murat; Unverdi, Ahmet; Bacaksiz, Emin (Scientific Technical Research Council Turkey-Tubitak, 2019)The present paper examines the effects of surface modification of CdS with diverse dyes on fabricated CdS-based hybrid solar cells. the X-ray diffraction results showed that CdS thin films had a hexagonal phase with a ... -
Fabrication and characterization of Au/n-ZnO/p-Si/Al sandwich device with Sol-gel spin coating method
Keskenler, Eyuep Fahri; Keskenler, Mustafa Furkan; Tomakin, Murat; Nevruzoglu, Vagif (Springer, 2019)ZnO thin films with the n-type properties were obtained on the p-Si substrates for multi-layered sandwich device depositing by sol-gel method. Au and Al were conducted on two side of hetero-junction by PVD technique. From ... -
Growth and characterization of Ag/n-ZnO/p-Si/Al heterojunction diode by sol-gel spin technique
Keskenler, Eyüp Fahri; Tomakin, Murat; Doğan, Seydi; Turgut, Güven; Aydın, Serdar; Duman, Songül; Gürbulak, Bekir (Elsevier Science Sa, 2013)Polycrystalline ZnO thin film was obtained on the p-Si for the heterojunction diode fabrication by sol-gel method. X-ray diffraction study showed that the texture of the film is hexagonal with a strong (002) preferred ... -
Growth and characterization of Cu2SnS3 (CTS), Cu2SnSe3 (CTSe), and Cu2Sn(S,Se)(3) (CTSSe) thin films using dip-coated Cu-Sn precursor
Bayazit, Tugba; Olgar, Mehmet Ali; Kucukomeroglu, Tayfur; Bacaksiz, Emin; Tomakin, Murat (Springer, 2019)Ternary compounds Cu2SnS3, Cu2SnSe3 and Cu2Sn(S,Se)(3) thin films used in thin film solar cell applications were prepared at the first time by such a two-stage process that includes dip-coating of Cu-Sn precursors as ... -
Improving the stability of solar cells using metal-organic frameworks
Nevruzoğlu, Vagif; Demir, Selçuk; Karaca, Gökçehan; Tomakin, Murat; Bilgin, Nuray; Yılmaz, Fatih (Royal Soc Chemistry, 2016)Although Cu2S-containing chalcogenide solar cells are appealing and cost-effective for photovoltaics (PVs), these materials suffer from rapid performance degradation as a result of the diffusion of copper ions into the CdS ... -
Influence of copper composition and reaction temperature on the properties of CZTSe thin films
Olgar, Mehmet Ali; Atasoy, Yıldız; Başol, Bülent M.; Tomakin, Murat; Aygün, Gülnur; Özyüzer, Lütfi; Bacaksız, Emin (Elsevier Science Sa, 2016)In this study Cu2ZnSnSe4 (CZTSe) compound layers were grown using a two-stage technique that involved deposition of metallic precursors (Cu, Zn, and Sn) and Se in the first stage, followed by reaction of all the species ... -
Investigation of Cd1-xCoxS diluted magnetic semiconductor thin films fabricated by chemical bath deposition method
Tomakin, Murat; Öncel, Yılmaz; Keskenler, Eyüp Fahri; Nevruzoğlu, Vagif; Onuk, Zuhal; Görür, Osman (Elsevier Science Sa, 2014)Chemical bath deposition method was used for preparation of Cd1-xCoxS thin films. the effects of Co doping and thermal annealing on structural, optical, electrical and magnetic properties of CdS thin films were investigated. ... -
The investigation of magnetic levitation performances of single grain YBCO at different temperatures
Guner, Sait Baris; Celik, Sukru; Tomakin, Murat (Elsevier Science Sa, 2017)The temperature dependence of the magnetic levitation force has been investigated for single-grain YBCO bulk sample, 20 mm in diameter with a thickness of 8 mm, fabricated by top-seeded melt growth (TSMG) method using Nd123 ... -
Role of Mg doping in the structural, optical, and electrical characteristics of ZnO-based DSSCs
ZnO- and Mg-doped ZnO samples are prepared by spray pyrolysis on conducting glass substrates to fabricate ZnO-based dye-sensitized solar cells (DSSCs). In uences of Mg-doping content on the power conversion efficiencies ... -
Role of the radio frequency magnetron sputtered seed layer properties on ultrasonic spray pyrolyzed ZnO thin films
Tomakin, Murat; Onuk, Zuhal; Rujisamphan, Nopporn; Shah, Syed Ismat (Elsevier Science Sa, 2017)Herein, we investigated structural and electrical properties of ultrasonic spray pyrolyzed ZnO thin films (ZnO (USP)) deposited on radio frequency sputtered ZnO nanocolumns (ZnO(Seed)) under various oxygen atmosphere on ... -
Synthesis and fabrication of Mg-doped ZnO-based dye-sensitized solar cells
Polat, İsmail; Yılmaz, Sevil Savaşkan; Bacaksız, Emin; Atasoy, Yıldız; Tomakin, Murat (Springer, 2014)Abstract Undoped and 2, 4 and 6 at.% Mg-doped ZnO nanorods were successfully deposited on ZnO seeded fluorine tin oxide substrates by a simple chemical bath deposition technique to form a photoanode. It was seen that all ... -
Use of the Cold Substrate Method for Biomaterials: the Structural and Biological Properties of the Ag Layers Deposited on Ti-6Al-4V
Duymus, Zeynep Yesil; Novruzoglu, Vagif; Atos, Sabit Melih; Yuzuak, Ercument; Tomakin, Murat (Springer, 2020)Silver nanofilms were vacuum-deposited on Ti-6Al-4V substrates at low (< 300 K) temperatures to improve their biocompatibility. After the surface of the Ti-6Al-4V samples was coated with Ag over the temperature range from ...
