96 research outputs found
Structural transformations of TiO2 films with deposition temperature and electrical properties of nanostructure n-TiO2/p-Si heterojunction diode
No full textWOS: 000340018500056Titanium oxide (TiO2) films have been deposited on p-Si substrates by sol-gel method using spin coating technique. Structural and morphological properties were studied as a function of deposition temperatures by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The deposition temperatures were chosen from 700 degrees C to 1100 degrees C. Crystallization of the anatase phase and its transformation to the rutile phase were observed at 700 degrees C and 800 degrees C, respectively. The fabrication of nanostructure n-TiO2/p-Si heterojunction diode was formed by using T7 film deposited at 700 degrees C. The electrical parameters such as barrier height (phi(b)) and ideality factor (n) of nanostructure n-TiO2/p-Si heterojunction diode were investigated by using I-V measurements and observed to be 0.58 eV and 5.39, respectively. Also, the values of phi(b) and series resistance (R-s) were determined by using Cheung's and Norde methods. From the I-V measurements taken at room temperature, the space charge limited (SCLC) mechanism was determined at the low voltage region. The obtained results showed that n-TiO2/p-Si heterojunction diode is a good candidate for the applications of semiconductor electronic devicesAnadolu University Commission of Scientific Research Project [1101F009, 1001F05]This work was supported by Anadolu University Commission of Scientific Research Project under Grant Nos. 1101F009 and 1001F05
Effect of ambient temperature on electrical properties of nanostructure n-ZnO/p-Si heterojunction diode
No full textWOS: 000303901900008The nanostructure n-ZnO/p-Si heterojunction diode was fabricated by sol-gel method. The structural and morphological properties of the nanostructure ZnO film have been investigated. The X-ray diffraction spectra indicated that the films are of polycrystalline nature. The scanning electron microscopy images indicate that the surface morphology of ZnO film is almost homogeneous and the ZnO film is consisted of the circular formed with coming together of the nanoparticles. The electrical characterization of nanostructure n-ZnO/p-Si heterojunction diode has been investigated by current-voltage characteristics. The ideality factor (n) of the diode was found for different ambient temperatures and the obtained 6.40 value for 296 K is higher than unity due to the interface states between the two semiconductor materials and series resistance. The values of n increased with decreasing ambient temperature. The reverse current of the diode increased with illumination intensity of 100 mW cm(-2) and the diode gave a maximum open circuit voltage V-oc of 0.19 V and short-circuits current I-sc of 8.03 x 10(-8) AAnadolu University Commission of Scientific Research Projects [081029, 1001F05]This work was supported by Anadolu University Commission of Scientific Research Projects under Grant Nos. 081029 and 1001F05
Effect of Deposition Time on the Properties of ZnO Nanopowder Prepared by Microwave-Assisted Hydrothermal Synthesis
No full text10th International Vacuum Electron Sources Conference (IVESC) -- JUN 30-JUL 04, 2014 -- Saint Petersburg, RUSSIAWOS: 000366469900031In this study, nanoparticule ZnO powders synthesized via microwave-assisted hydrothermal method at different deposition time. The effects of deposition time on structural and morphological properties of nanoparticule ZnO powders. Nanoparticule ZnO powders have polycrystalline structure with (002) preferential orientation. The information on crystallite size were obtained from the fullwidths-at-half-maximum (FWHM) of the diffraction peaks. Surface morphology was studied using a ZEISS Ultraplus model field emission scanning electron microscopy (FESEM).IEE
Effect of deposition parameters on the structural properties of ZnO nanopowders prepared by microwave-assisted hydrothermal synthesis
No full textWOS: 000348955300072PubMed ID: 25541399ZnO nanopowders were synthesized via microwave-assisted hydrothermal method at different deposition (microwave irradiation) times and pH values. The effects of pH and deposition (microwave irradiation) time on the crystalline structure and orientation of the ZnO nanopowders have been investigated by X-ray diffraction (XRD) study. XRD observations showed that the crystalline quality of ZnO nanopowders increased with increasing pH value. The crystallite size and texture coefficient values of ZnO nanopowders were calculated. The structural quality of ZnO nanopowder was improved by deposition parameters. Field emission scanning electron microscope (FESEM) was used to analyze the surface morphology of the ZnO nanopowders. Microwave irradiation time and pH value showed a significant effect on the surface morphologyAnadolu University Commission of Scientific Research Project [1306F243]This work was supported by Anadolu University Commission of Scientific Research Project under Grant No. 1306F243. The authors would like to thank to Anadolu University Chemistry Department and Dr. Deniz HuR for laboratory facilities
Conceptual development of ethical climate and its impacts on individuals and organizations
No full textAksoy, Seval (Dogus Author)“Örgütsel Etik İklim (ÖEİ)” kavramı özellikle 2000’li yıllarda üzerinde fazlasıyla araştırma yapılmış olan bir örgütsel davranış çalışma konusudur. Yapılan bu çalışmada, ÖEİ’nin örgütsel özdeşleşme (ÖÖ), örgütsel bağlılık (ÖB) ve kişiörgüt uyumu (KÖU) kavramlarıyla olan ilişkileri, Kocaeli’nde faaliyet göstermekte olan imalat firmalarında yapılan bir uygulamalı çalışma ile test edilmiştir. Analiz sonuçlarına göre, ÖEİ ile ÖÖ ve ÖB arasında pozitif ilişkinin bulunduğu, ayrıca ÖEİ ile ÖB ve ÖÖ arasındaki ilişkide KÖU’nun kısmi ara değişken rolü oynadığı tespit edilmiştir.The concept of “Organizational Ethical Climate (OEC)” is a subject matter of organizational attitude research study on which many researchers have been conducted so far, especially after 2000’s. In this research, relationships among OEC and organizational identification (OI), commitment (OC) and personorganization fit (POF) are analyzed through an empirical research conducted in manufacturing firms located in Kocaeli. Results indicate that there are positive relationships between OEC and OI, as well as OEC and OC, also POF mediates the relationships between OEC and OI / OC
Sol–gel derived Li–Mg co-doped ZnO films: Preparation and characterization via XRD, XPS, FESEM
No full textWOS: 000296769400031Li-Mg co-doped ZnO films have been deposited onto glass substrates by sol-gel spin coating method. The structural and morphological properties of the films were characterized by X-ray diffractometer (XRD), X-ray photo-electron spectroscopy (XPS) and field emission scanning electron microscopy (FESEM). The XRD spectra indicated that the films have polycrystalline nature. The crystallite size values decreased with the increasing Mg content. The chemical composition of the Li-Mg co-doped ZnO films were confirmed by XPS. Additionally, XPS results clearly showed the existence of Mg as a doping element into ZnO crystal lattice. The surface morphology of the films was found to depend on the concentration of Mg in the ZnO:Li. The absorption band edge values of the films were calculated and these values of the films increased with increasing Mg concentration. The refractive index dispersion curves of the films obeyed the single-oscillator model. The dispersion parameters such as E-o (single-oscillator energy) and E-d (dispersive energy) of the films were determined and increase with Mg contentAnadolu University Commission of Scientific Research [061039, 081029, 1001F05]This work was supported by Anadolu University Commission of Scientific Research Projects under Grant No. 061039, 081029 and 1001F05
Sol–gel derived zinc oxide films: Effect of deposition parameters on structure, microstructure and photoluminescence properties
No full textWOS: 000296999500004ZnO films were prepared by sol-gel method and deposited onto glass substrates with spin coating system. XRD patterns and FESEM analysis were used to investigate the effect of deposition parameters such as spin speed and molar concentration on the crystallinity and surface morphology of the films. XRD patterns show that ZnO films are polycrystalline with type-wurtzite hexagonal structure. The film which is deposited at 4000 rpm and with 0.5 M sol has the best crystallinity. The FESEM micrographs showed that the surface morphology of the films was not significantly affected from the spin speed. FESEM micrographs showed that the crystallite sizes of 1000, 4000 and 5000 rpm are almost same. But 2000 and 3000 rpm have lower crystallite sizes than the others. Also, the amount of voids in the 1 M was found higher. The effect of spin speed and molar concentration on the optical properties of ZnO films was investigated by PL spectroscopy. The electrical properties of the ZnO films were investigated by using two probe methods in dark. The highest conductivity values were obtained for ZnO films prepared by 4000 spin speed and 0.5 M of concentrationAnadolu University Commission of Scientific Research [061039, 081029, 1001F05]This work was supported by Anadolu University Commission of Scientific Research Projects under Grant Nos. 061039, 081029 and 1001F05. The authors thank Dr. Liu Jinping in Institute of Nanoscience and Nanotechnology (Huazhong Normal University) for his help in PL measurements
Effect of Water Quality Values on Gammaridae and Ephemeroptera Biodiversity in Mezit River (Bilecik-Turkey)
No full text3rd World Congress on Civil, Structural, and Environmental Engineering, CSEE 2018 -- 8 April 2018 through 10 April 2018 -- -- 139898[No abstract available
Fabrication of p-Si/n-ZnO:Al heterojunction diode and determination of electrical parameters
No full textWOS: 000425075900078We present a fundamental experimental study of a microwave assisted chemical bath deposition (MW-CBD) method for Al doped ZnO films. Field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) spectroscopy were used to analyze the microstructures and crystalline structures of these films, respectively. The p-Si/n-ZnO:Al heterojunction diodes were fabricated. The current-voltage (I-V) characteristics of these diodes were measured at room temperature. The important electrical parameters such as series resistance, the ideality factor and the barrier height were determined by performing plots from the forward bias I-V characteristics using different methods. The obtained results indicate that Al doping improve the electrical properties of the p-Si/n-ZnO diode. The best rectification properties were observed in the p-Si/n-ZnO:5%Al heterojunction diode, so only capacitance-voltage (C-V) measurements of this diode were taken. Electrical parameter values such as series resistance, the built-in potential and the acceptor concentration calculated for this heterojunction diodeAnadolu University Commission of Scientific Research [1402F055, 1605F449]This work was supported by Anadolu University Commission of Scientific Research Projects under Grant No. 1402F055 and 1605F449
Effect of channel thickness on the field effect mobility of ZnO-TFT fabricated by sol gel process
No full textWOS: 000345421900028In this study, bottom-gate structured ZnO TFTs were fabricated on pSi/SiO2 substrate. ZnO active layers with different thickness were deposited by using sol gel spin coating method and the electrical performances of the obtained TFTs were investigated regarding the thickness of the channel layer. The effects of channel thickness on the structural and morphological properties of ZnO were examined. The mobility values of TFTs were significantly improved by increasing the thickness of active channel layer and the highest mobility of ZnO TFTs was obtained by 1.09 cm(2)/V s for 140 nm layer. ZnO TFTs showed a high off-current and this current increased as the channel thickness increasedAnadolu University Commission of Scientific Research [1101F009]This work was supported by Anadolu University Commission of Scientific Research Projects under Grant No. 1101F009
- …
