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  • Küçük Resim
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    Biosensor properties of plasmonic silver nanoparticles produced by the pld mechanism
    (International Engineering, Science and Education Group, 2021) Candan, İlhan; Gezgin, Serap Yiğit; Gündoğdu, Yasemin; Gümgüm, Hadice Budak
    Plasmonic metal nanoparticles (NPs), such as Ag, Au, Cu NPs, attract great interest due totheir notable applications in biological, and chemical sensing. Researchers have studied the plasmonicmetal NPs which have exceptional optical properties in a large spectral region. Metal NPs form aunique surface plasmon resonance (SPR) peak that is in the electromagnetic spectrum’s visible part. The peak of SPR firmly depends on the NP’s size, shape, dielectric constant, and medium that theparticle is in. Light interacts with nanoparticles that are smaller than the wavelength of incident lightin localized surface resonance. That leads Localised Surface Plasmon Resonance (LSPR) in which anoscillating local plasma around the NP with a certain frequency form. The LSPR detection is the mostcommon method for wavelength shift measurement. Since analyte absorption causes a significant change on the value of local dielectric constant, the LSPR peak shifts. It is known that biologicalmolecules such as proteins and antibodies can sensitively be detected while they affect the localdielectric environment. Therefore, Ag or Au based metal NPs can be used as a sensor with the help ofLSPR wavelength shift technique. Among the metal NPs, Ag has a relatively higher refractive indexsensitivity. Moreover, Ag NPs generate measurements that are more precise since they have a shaperLSPR peak. In our work, we produce plasmonic Ag NPs with various sizes and spherical shapes bymaking use of the Pulsed Laser Deposition (PLD) mechanism. Subsequently, we have investigate theLSPR peaks of these NPs via the UV-Vis spectroscopy. Additionally, biosensor properties of plasmonicAg NPs are investigated by binding Protein A molecules to surface of the NPs. It is significant to mentionhere that we obtain an LSPR wavelength shift, which has a value around 100 nm/RIU.
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    Experimental and theoretical investigation of Zr-Doped CuO/Si solar cell
    (John Wiley and Sons Inc., 2024) Gezgin, Serap Yiğit; Baturay, Şilan; Özaydın, Cihat; Kılıç, Hamdi Şükür
    Copper oxide (CuO) is a nanostructured semiconductor material with the potential for solar energy conversion and can be suitable for solar cells when used as a thin film. Herein, nondoped and doped (doping ratios of 1%, 2%, and 3% zirconium [Zr]) CuO thin films on silicon (Si) with the spin-coating technique are developed. Optical and topological characterizations of CuO thin films are examined by ultraviolet-visible and X-ray diffraction. The electrical properties of nondoped and Zr-doped CuO/Si heterojunctions are investigated with experimental current–voltage measurements in the dark and under illuminated conditions. The electrical behavior of nondoped and Zr-doped CuO/Si heterojunctions is obtained using the experimental J–V technique and computational Cheung–Cheung and Norde methods. A simulation based on nondoped and Zr-doped CuO/n-Si heterojunction solar cells using SCAPS-1D is completed. Photovoltaic (PV) parameters of experimentally produced and theoretically calculated CuO and Zr-doped CuO/Si heterojunction solar cells are compared. Accordingly, PV parameters of 1% Zr-doped CuO/Si solar cells show the highest power conversion efficiency calculated as a function of interfacial defect density and hole carrier concentration.
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    Influence of Mn doping on electrical properties of TiO2/Si heterojunction diode
    (De Gruyter Open Ltd., 2023) Baturay, Şilan; Biçer, Ömer; Gezgin, Serap Yiğit; Candan, İlhan; Gümgüm, Hadice Budak; Kılıç, Hamdi Şükür
    In this special work, two types of material, which are undoped and Mn doped TiO2 thin films, have been produced by spin coating technique, and then their structural, morphological and optical properties have been measured at different Mn doping rates. Four different doping ratios, undoped, 1, 3 and 5% Mn doped TiO2 have been both experimentally and theoretically investigated and some significant enhancements have been reported. The results of X-ray diffraction (XRD) such as dislocation density, strain, and crystallite size have indicated that undoped, 1, 3 and 5% Mn doped TiO2 thin films had the phase of anatase at 450 °C. It has been observed that the peak intensity of 3% Mn doped TiO2 films has decreased compared to undoped and 1% Mn doped TiO2 while the peak intensity has increased for 5% Mn doped TiO2. The refractive indices and dielectric coefficients of the undoped and Mn doped TiO2 thin films have also been calculated. The undoped and Mn doped TiO2/p-Si heterojunction diodes has exhibited photosensitive behaviour in the illuminated environment. 1% Mn doped TiO2/p-Si heterojunction diode indicated the highest photocurrent. The electrical parameters of all diodes have been calculated and compared to the conventional J–V and Norde methods. Additionally, 1% Mn doped TiO2/p-Si heterojunction diode has been modelled by using the SCAPS-1D program, and J ph values have also been calculated based on the shallow donor density (N D ). The experimental and theoretical J ph values of this diode were found to be compatible with each other.
  • Küçük Resim
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    Modelling of the solar cell based CU2SNS3 thin film produced by spray pyrolysis
    (International Engineering, Science and Education Group, 2022) Gezgin, Serap Yiğit; Candan, İlhan; Baturay, Şilan; Kılıç, Hamdi Şükür
    Cu2SnS3 (CTS) thin film has been produced for 30 ccm sulphur flux rate at 30 minutes annealing durations at 550 oC temperature.CTS thin film’s crystalline structure has been investigated and crystalline size, lattice parameters, dislocation density and microstrain, crystalline number have also been determined.The CTS thin film’s morphological and optical properties have been examined and thoroughly interpreted.Mo/CTS/CdS/AZO solar cell has been modelled based on CTS thin film produced at the present work, using SCAPS-1D simulation programme.Voc, Jsc, FF, conversion efficiency and photovoltaic parameters have been determined depending on neutral defect density at the interface, coefficient of radiative recombination, Auger electron/hole capture’s coefficient and operation temperature of CTS solar cell.As a consequence of simulation study, ideal efficiency of CTS solar cell has been determined to be 3.72 % and all the data obtained in this study have been presented, interpreted and concluded to be original results.
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    Numerical analysis of the thin film solar cell modelled based on in doped CdS semiconductor
    (2023) Gezgin, Serap Yiğit; Baturay, Şilan; Kılıç, Hamdi Şükür
    In this study, pure and 1%, 2% and %3 In-doped CdS thin films were produced by spray pyrolysis method. CdS is an n-type (II-VI group) semiconductor material and used as a buffer layer in solar cells. By doping In into CdS thin film, it was investigated how optical and crystalline behavior of thin film are changed. Using Moss and Herve&Vandamme and Ravindra relations, refractive indices and dielectric coefficients were investigated depending on the band gap of the obtained CdS sample. It has been observed that In element decreases the band gap of CdS thin film, improved its crystal structure and reduced its roughness. Therefore, 3% In doped CdS has gained a more ideal feature for use as an n-type semiconductor in solar cells. CIGS/In doped CdS solar cell was modelled and analysed by SCAPS-1D simulation program by using the physical parameters of the semiconductor layers that make up solar cells as imputs of program. Photovoltaic parameters of solar cell based on donor defect density, the neutral interface defect density and Auger electron/hole capture coefficient which were calculated by using In %3 doped CdS thin film, which has the most ideal n-type semiconductor properties.
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    OPTICAL, MORPHOLOGICAL, STRUCTURAL, AND PHOTOCATALYTICAL PROPERTIES OF PLASMONIC AU NPS PRODUCED BY PULSED LASER DEPOSITION
    (Bilal GÜMÜŞ, 2024) Candan, İlhan; Gezgin, Serap Yiğit; Gümgüm, Hadice Budak; Kılıç, Hamdi Şükür
    Plasmonic Au NPs exhibit exceptional optical, morphological, and structural properties, making them promising materials for applications in photocatalysis, sensing, and energy conversion. This study explores the synthesis and characterization of plasmonic gold NPs produced by pulsed laser deposition, a versatile physical vapor deposition technique. Pulsed Laser Deposition enables precise control over NP formation through tunable parameters such as laser fluence, ambient gas environment, and deposition duration. The resulting NPs were systematically analyzed to evaluate their optical properties, including localized surface plasmon resonance, as well as their morphological and structural attributes. The localized surface plasmon resonance behavior of the synthesized Au NPs was found to be highly dependent on particle size, shape, and distribution, as revealed by UV-Vis spectroscopy and electron microscopy. Structural analysis via X-ray diffraction confirmed the crystalline nature of the NPs, with lattice parameters correlating to their stability and catalytic efficiency. Photocatalytic activity tests demonstrated that the gold NPs could effectively degrade organic pollutants under visible light, leveraging their strong LSPR-induced hot electron generation and charge transfer properties. In this study, gold NP thin film was produced on microscopic glass by Pulsed Laser Deposition system. Gold NPs thin film photocatalyst efficiency 95.00% and reaction rate constant 0.39 min-1 were calculated. At the end of 210 min, MB dye was degraded and turned into high transparency due to localized surface plasmon resonance property of gold NP. The findings may provide valuable insights into the design and application of plasmonic Au NPs in photocatalysis and other advanced technologies.
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    Puls Lazer Depozisyonu Yöntemiyle Üretilen Plazmonik Altın Nanoparçacıkların Sensör Özelliklerinin Araştırılması
    (Munzur Üniversitesi, 2024) Candan, İlhan; Gezgin, Serap Yiğit; Gümgüm, Hadice Budak; Kılıç, Hamdi Şükür
    Plazmonik altın nanoparçacıklar (Au NP'ler), özellikle Lokalize Yüzey Plazmon Re-zonansı (LSPR) sayesinde, sensör uygulamaları için ideal adaylar olarak öne çıkan üstün optik özelliklere sahiptir. Bu nanoparçacıklar, çevrelerindeki ortamdaki deği-şimlere karşı yüksek hassasiyet gösterir ve bu sayede moleküler etkileşimlerin ve çevresel değişimlerin hassas bir şekilde tespit edilmesini sağlar. Bu çalışmada, kim-yasal reaktiflere ihtiyaç duyulmadan parçacık boyutu, morfolojisi ve dağılımı üzerin-de hassas kontrol imkânı tanıyan temiz ve çok yönlü bir yöntem olan Puls Lazer De-pozisyonu (PLD) ile üretilen altın nanoparçacıkların sensör özellikleri incelenmiştir. PLD işlemi, ayarlanabilir plazmonik özelliklere sahip altın nanoparçacıklar üretmek için lazer akısı, puls süresi ve biriktirme süresi ayarlanarak optimize edilmiştir. Altın nanoparçacıkların yapısal ve optik özellikleri, taramalı elektron mikroskobu (SEM) ve UV-Vis spektroskopisi kullanılarak analiz edilmiş ve parçacık boyutu ile morfolo-jisinin biriktirme parametreleri ile kontrol edilebildiği doğrulanmıştır. Altın nano-parçacıkların sensör performansı, çevrelerindeki ortamın kırılma indisi değişimlerine duyarlılıklarını gösteren LSPR ölçümleri ile değerlendirilmiştir. Özellikle, LSPR piki, protein A dâhil çeşitli analizlere maruz bırakıldığında 50 nm dalga boyu kayması ile ölçülmüş ve bu nanoparçacıkların biyosensör uygulamaları için yüksek hassasiyete sahip olduğunu göstermiştir. Sonuçlar, PLD ile üretilen altın nanoparçacıkların gerçek zamanlı algılama ve çevresel izleme için umut vadeden sensör özelliklerine sahip ol-duğunu ve geniş bir sensör uygulama yelpazesi için verimli ve yeniden üretilebilir bir platform sunduğunu göstermektedir.
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    SIMULATION STUDIES OF CR DOPED CUO HETEROJUNCTION SOLAR CELL
    (Bilal GÜMÜŞ, 2023) Gezgin, Serap Yiğit; Baturay, Şilan; Candan, İlhan; Kılıç, Hamdi Şükür
    1% and 3% Cr doped CuO thin films have been deposited on soda lime glass by spin coating method and then their structural, morphological and optical properties have been investigated by operating X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Ultraviolet-Visible Spectroscopy (UV-Vis) techniques, respectively. XRD patterns of CuO:Cr (1%) and CuO:Cr (3%) thin films demonstrate characteristics of monoclinic CuO structure with a C2/c space group. The morphology of coated film plays an important role in analyzing some optoelectronic properties. 1% Cr doped CuO thin film absorbs more photons compared to 3% Cr doped CuO in Vis and UV regions. The band gaps of 1% Cr and 3% Cr doped CuO thin films are to be 2.18 eV and 2.30 eV, respectively. The Mo/1% and 3% Cr doped CuO/n-ZnO/i-ZnO/AZO solar cell has modelled with SCAPS-1D simulation program. The photovoltaic (PV) parameters of solar cell deteriorated with some increase in the neutral defect density (N_t) value. As the shallow acceptor defect density (N_a) value is increased, J_SC is decreased, V_OC, FF and ? are increased. PV performance of 1% Cr doped CuO solar cell were found to be better than that of 3% Cr doped CuO solar cell. The efficiency of 1% Cr doped CuO solar cell is increased with the use of SnO2 intermediate layer in 2 nm thickness at the heterojunction interface.