Sarı, Emre
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Sarı, E.
Sari, E
Sari, E.
Sari, Emre
Sarı, E
Sari, E
Sari, E.
Sari, Emre
Sarı, E
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Email Address
emresari@iyte.edu.tr
Main Affiliation
04.04. Department of Photonics
Status
Former Staff
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Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
0
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3GOOD HEALTH AND WELL-BEING
0
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4QUALITY EDUCATION
0
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5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
1
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7AFFORDABLE AND CLEAN ENERGY
5
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8DECENT WORK AND ECONOMIC GROWTH
2
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
5
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
0
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
3
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13CLIMATE ACTION
4
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14LIFE BELOW WATER
0
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15LIFE ON LAND
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
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17PARTNERSHIPS FOR THE GOALS
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Documents
33
Citations
569
h-index
11
Documents
11
Citations
425
Scholarly Output
7
Articles
2
Views / Downloads
5741/4178
Supervised MSc Theses
5
Supervised PhD Theses
0
WoS Citation Count
64
Scopus Citation Count
69
Patents
0
Projects
3
WoS Citations per Publication
9.14
Scopus Citations per Publication
9.86
Open Access Source
7
Supervised Theses
5
| Journal | Count |
|---|---|
| Nanotechnology | 1 |
| Physical Review B | 1 |
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7 results
Scholarly Output Search Results
Now showing 1 - 7 of 7
Article Citation - WoS: 39Citation - Scopus: 39Polarized Emission From Cspbbr3 Nanowire Embedded-Electrospun Pu Fibers(IOP Publishing Ltd., 2018) Güner, Tuğrul; Topçu, Gökhan; Savacı, Umut; Genç, Aziz; Sarı, Emre; Demir, Mustafa MuammerInterest in all-inorganic halide perovskites has been increasing dramatically due to their high quantum yield, band gap tunability, and ease of fabrication in compositional and geometric diversity. In this study, we synthesized several hundreds of nanometer long and ∼4 nm thick CsPbBr3 nanowires (NWs). They were then integrated into electrospun polyurethane (PU) fibers to examine the polarization behavior of the composite fiber assembly. Aligned electrospun fibers containing CsPbBr3 NWs showed a remarkable increase in the degree of polarization from 0.17-0.30. This combination of NWs and PU fibers provides a promising composite material for various applications such as optoelectronic devices and solar cells.Master Thesis Fabrication and Characterization of Graphene/Silicon Based Schottky Photodiode(Izmir Institute of Technology, 2019) Dönmez, Gülçin; Çelebi, Cem; Sarı, EmreThis thesis focused on fabrication and characterization of CVD grown p-type graphene and n-type Si Schottky junction photodiode with rectification behavior. The device operated at wavelength range between 390 and 1100 nm at self-powered mode. The device was encapsulated with Epoxy Resin to prevent graphene from atmospheric adsorbates. The electronic and optoelectronic characterizations of the devices were done before and after coating the devices with ER. By encapsulation stability of the device was enhanced in terms of photoresponsivity. The maximum obtained photoresponsivity value of the bare device was 0.56 A/W. Also, time-resolved photocurrent spectroscopy measurements showed that the devices exhibited enhanced photodetector performance in terms of photo-switching characteristics. Furthermore, electrical characteristics of Gr/n-Si Schottky photodiode under various illumination power densities with 850 nm wavelength were investigated. The short circuit current showed linear response to power density. However, open circuit voltage exhibited two phased slow and fast increment with increased power density. Hall effect measurements were conducted in order to investigate hole carrier concentration and mobility of the graphene on n-Si. With increasing the power density the carrier concentration increased and the mobility decreased. Besides, light induced manipulation of the Schottky barrier height of Gr/n-Si photodiode was studied. Schottky barrier height of the graphene measured by KPFM method as 0.4 eV. With increasing power density we found that Schottky barrier height of the device increased from 0.4 eV to 0.5 eV and showed similar trend with the change in open circuit voltage.Master Thesis Desing Strategies for Solar Car Parks: a Case Study for Iztech Library Parking Lot(Izmir Institute of Technology, 2020) Bursa, Enes; Sarı, EmreThe world’s need for renewable resources is growing as a result of the global climate crisis. In order to overcome this issue. The Paris Agreement was signed by the nations as a step for solution to this issue. In it, targets for future were set, and the nations pledged to meet these targets. Nowadays investments in energy production from renewable sources are increasing. When compared to 2019, the amount of energy produced from renewable sources grew by 12.5% in 2020. Photovoltaic systems are receiving more investment as a result of their growing efficiency. In 2020, photovoltaic system production climbed by 20.5 percent. Turkey is increasing their investment in photovoltaic systems. It is crucial for universities to be pioneers in energy production from renewable sources. The studies carried out by universities should be taken into account in terms of both increasing knowledge in this area and having people resource who are trained in it. In this study, the open parking area of the library building of the Izmir Institute of Technology were covered with a roof in order to simulate and analyze the installation of photovoltaic solar panels on the roof. These simulations and calculations were done using software called Enact Systems. PVWatts is utilized by Enact system for climate and photovoltaic calculations infrastructure. 560 panels have been installed on the 835 m2 covered parking lot. The installed power of the panels is 224 kW, and they can generate about 302 gWh of electricity annually. This amount is equal to 51% of library consumption. With this production, the amortization period of the investment is calculated as 8 years.Master Thesis Fabrication of Perovskite Solar Cells Using Ultrasonic Spray Coating(Izmir Institute of Technology, 2022) Ceyhan, Eray; Sarı, EmrePerovskite solar cells (PSCs) are one of the most prominent research field for the last decade in photovoltaic technology. From 3.8 percent in 2009 to 25.7 percent in 2021 in single-junction architectures, and to 29.8 percent in silicon-based tandem cells, solar cell efficiencies of laboratory-scale devices using these materials have increased, surpassing the maximum efficiency achieved in single-junction silicon solar cells. Therefore, as of now, perovskite solar cells represented the solar technology that was developing the fastest. Perovskite solar cells have gained commercial appeal thanks to their extremely low production costs and promise for even higher efficiency. Their short- and long-term stability are key issues and research topics. In this context, the development of scalable perovskite solar cell fabrication has become essential. A novel ultrasonic spray casting technique is employed by incorporating hot nitrogen gas blowing as a scalable deposition method. We tried to optimize the perovskite film crystallization by applying our technique. With the help of our hot nitrogen gas blowing pipe we are able to enhance the nucleation process and at a desired levels. These investigations are supported by characterization tools such as optical microscope, scanning tunneling microscope, and current-voltage measurement. MAPb(I1-xBrx)3 precursor solution containing DMF and DMSO as solvent was used in our experiments. We examined the effect on the surface roughness change by adjusting the DMF and DMSO ratios. Finally, we construct a device of FTO/ c-TiO2/ m-TiO2/ MAPb(I1-xBrx)3/Spiro-OMeTAD/Au architecture and able to investigate the electrical characteristic of under dark and illumination.Master Thesis Plasmonic Enhancement of Perovskite Photoluminescence(Izmir Institute of Technology, 2020) Tan, Metin; Sarı, Emre; Balcı, SinanRecently emerged perovskite materials show superior features like high efficiency, defect tolerance, facile synthesis, bandgap tunability and wide color gamut over their rivals in photonics applications. On the other hand, metals have interesting characteristics as they go smaller in size. Their absorption and scattering properties are completely different as nanoparticles. Their confined electron oscillations bring peculiar consequences. Due to change in these features, metallic nanoparticles can enhance or quench fields around them. Light-matter interactions determine how we see the world. Understanding quantum nature of light and matter and their interactions can benefit higher efficiencies and can open paths for novel technologies. In accordance with this purpose, this thesis study involves synthesis of cesium lead halide perovskite emitters and investigation of their interactions with silver nanoisland films. It was concluded that direct contact between perovskite layer and nanoislands results in a fluorescence quenching where intensity average lifetime decreases below 1 ns. Separating these layers with an alumina dielectric layer increased photoluminescence intensity after 15 nm and the highest intensity was observed at 18 nm thickness with 78% of PL enhancement. With different spacer thickness values, we achieved to see the change in photoluminescence intensity.Master Thesis Manufacturing and Characterization of Perovskite Thin Films Using Novel Methods(Izmir Institute of Technology, 2020) Bıyıklı, Ozan; Sarı, Emre; Tekin, Hüseyin CumhurPerovskite photovoltaics is a promising technology due to its low-cost fabrication and high efficiency. Since their first demonstration in 2009, efficiencies of perovskite solar cells (PSCs) increased unprecedently fast from 3.81% to 25.2% in 10 years. The most common method for the deposition of the absorber layer of the perovskite solar cells is the spin-coating method, which is not a scalable method, and this method is an obstacle to their commercialization. Efficiencies obtained with scalable methods are currently lower than that of the spin-coating method. In this thesis, among the scalable deposition methods, a novel ultrasonic spray-coating was used by adding antisolvent vapor to the system. The antisolvent quenching technique, that is commonly used to improve the crystalline quality of the film by spin-coating was successfully adapted for ultrasonic spray coating. The interaction between diethyl ether (DE) vapor, which is used as an antisolvent, and MAPb(I(3-x)Brx)3 precursor solution (where the solvent is DMF:DMSO, 4:1) was utilized to improve the crystalline quality of the perovskite film. As a result of this interaction, the intermediate phase was observed. The transition to the intermediate phase is supported by data from characterization methods such as optical microscopy, scanning electron microscopy (SEM), X-Ray diffraction (XRD), and current-voltage measurement. Furthermore, n-i-p devices with the FTO/c-TiO2/m-TiO2/MAPb(I(1-x)Brx)3/Spiro-OMeTAD architecture were produced with different antisolvent vapors and their efficiencies was compared. It was observed that devices using DE vapor reach higher efficiencies than devices without any antisolvent vapor.Article Citation - WoS: 25Citation - Scopus: 30Thinning Cspb2br5 Perovskite Down To Monolayers: Cs-Dependent Stability(American Physical Society, 2017) İyikanat, Fadıl; Sarı, Emre; Şahin, HasanUsing first-principles density functional theory calculations, we systematically investigate the structural, electronic, and vibrational properties of bulk and potential single-layer structures of perovskitelike CsPb2Br5 crystal. It is found that while Cs atoms have no effect on the electronic structure, their presence is essential for the formation of stable CsPb2Br5 crystals. The calculated vibrational spectra of the crystal reveal that not only the bulk form but also the single-layer forms of CsPb2Br5 are dynamically stable. Predicted single-layer forms can exhibit either semiconducting or metallic character. Moreover, the modification of the structural, electronic, and magnetic properties of single-layer CsPb2Br5 upon formation of vacancy defects is investigated. It is found that the formation of Br vacancy (i) has the lowest formation energy, (ii) significantly changes the electronic structure, and (iii) leads to ferromagnetic ground state in the single-layer CsPb2Br5. However, the formation of Pb and Cs vacancies leads to p-type doping of the single-layer structure. Results reported herein reveal that the single-layer CsPb2Br5 crystal is a novel stable perovskite with enhanced functionality and a promising candidate for nanodevice applications.