Center for Solar Energy Research and Applications (GÜNAM)

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Publication (51)
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Turan, Raşit (23)
Ameri, Mohsen (22)
Mohajerani, Ezeddin (12)
Çiftpınar, Emine Hande (9)
Ünal, Mustafa (9)

Condensed Matter Physics (6)
Electrical and Electronic Engineering (6)
Electronic, Optical and Magnetic Materials (6)
General Materials Science (3)
Renewable Energy, Sustainability and the Environment (3)

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2011 - 2019 (43)
2020 - 2022 (17)

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Journal Article (33)
Conference Paper (11)
Project (6)

Recent Submissions

Interface stability problem towards the end of THM growth of cadmium zinc telluride crystals
Ünal, Mustafa; Balbaşı, Özden Başar; Genç, Ayşe Merve; Parlak, Mehmet; Turan, Raşit (2022-04-15)
Growth of CdZnTe crystals by Travelling Heater Method (THM) is widely investigated by different groups. Interface shape and stability are critical parameters for the successful growth of high-quality CZT crystals. Even tho...
Simplified process flow for the fabrication of PERC solar cells with ion implanted emitter
Bektas, Gence; Kokbudak, Gamze; Kececi, Ahmet Emin; Butuner, Sumeyye Kocak; Asav, Hasan; Çiftpınar, Emine Hande; Canar, Hasan Huseyin; Arikan, Bulent; Turan, Rasit (2021-12-01)
Ion implanted PERC cells have already achieved power conversion efficiencies of about 20.0%. The process flows reported in the literature for the ion implanted PERC cells with commonly utilized Al2O3/SiNx rear passivation ...
Fourteen percent efficiency ultrathin silicon solar cells with improved infrared light management enabled by hole-selective transition metal oxide full-area rear passivating contacts
Nasser, Hisham; Borra, Mona Zolfaghari; Çiftpınar, Emine Hande; Eldeeb, Basil; Turan, Raşit (2021-11-01)
The present study investigates the application of hole-selective transition metal oxide (TMO) layers (MoOx, V2Ox, and WOx) with silver (Ag) as full-area rear contact to 22.5 mu m-thick low-quality Cz p-type c-Si solar cell...
Yüksek Verimli PERC Güneş Pilleri için Pikosaniye Atımlı Lazer ile Lazer Doping Yoluyla Seçici Emitör Oluşumu
Bektaş, Gence (2021-11-01)
In this study, we develop a POCl3 diffusion recipe so that we obtain a thicker phosphosilicate glass layer for laser doping. The formation of a laser doped selective emitter is achieved by utilizing an industrial-type pico...
ZnO-SrAl2O4:Eu Nanocomposite-Based Optical Sensors for Luminescence Thermometry
Ghahrizjani, Reza Taheri; Ghafarkani, Mashhood; Janghorban, Samira; Ameri, Mohsen; Azadinia, Mohsen; Mohajerani, Ezeddin; Qaryan, Mahdi; Eslami, Pegah; Fouladinasab, Hatef (2021-09-01)
Conventional thermometers fail to operate in a variety of medical procedures due to the harsh and sensitive environments required for such applications, and therefore, the development of optical fiber thermometers has gain...
Optical design of TCO-free interconnecting layer for all-perovskite tandem solar cells
Koc, Mehmet; Ameri, Mohsen; Yerci, Selçuk (2021-07-12)
Organic-inorganic hybrid perovskite materials are excellent candidates as light absorbers in tandem solar cells with advantages of tunable bandgaps, high absorption coefficients, and facile and low-cost fabrication process...
Maximizing the performance of single and multijunction MA and lead-free perovskite solar cell
Azadinia, M.; Ameri, Mohsen; Ghahrizjani, R.T.; Fathollahi, M. (2021-06-01)
Finding a highly stable and appropriate perovskite solar cell with optimum design parameters is crucial for being included as the top cell in tandem structure, with Si as the bottom cell, to realize the power conversion ef...
A Study on Tetragonal-star Like Shaped Inverted Pyramid Texturing
Donercark, Ergi; Çiftpınar, Emine Hande; Terlemezoğlu, Makbule; Colakoglu, Tahir; Turan, Raşit (2021-01-01)
Surface texturing is one of the key process steps in solar cell fabrication. For an ideal surface texturing, surface recombination should be kept as low as possible while the light trapping property is improved. The format...
A Thienothiophene-Based Cation Treatment Allows Semitransparent Perovskite Solar Cells with Improved Efficiency and Stability
Gunes, Ummugulsum; Bag Celik, Esra; Akgül, Çağla; Koc, Mehmet; Ameri, Mohsen; Uzuner, Bahri E.; Ghasemi, Milad; Şahiner, Mehmet Cem; Yıldız, İlker; Kaya, Hava Z.; Yerci, Selcuk; Gunbas, Gorkem (2021-01-01)
Perovskite surface treatment with additives has been reported to improve charge extraction, stability, and/or surface passivation. In this study, treatment of a 3D perovskite ((FAPbI3)1−x(MAPbBr3)x) layer with a thienothio...
Integrating National Research Agendas on Solar Heat for Industrial Processes (INSHIP)
Baker, Derek Keıth(2020-12-31)
Despite process heat is recognized as the application with highest potential among solar heating and cooling applications, Solar Heat for Industrial Processes (SHIP) still presents a modest share of about 0.3% of total ins...
Implementation of generalized Harvey-Shack theory in light scattering from rough surfaces
Gunoven, M.; Nasser, H.; Ünal, Mustafa; Aytekin, O.; Turan, Raşit; Bek, Alpan (2020-12-01)
We present a discrete implementation of generalized Harvey-Shack scalar scattering theory to calculate angular intensity distributions from height profiles of select randomly textured surfaces proposed for use in solar cel...
On the application of hole-selective MoOx as full-area rear contact for industrial scale p-type c-Si solar cells
Nasser, Hisham; Es, Fırat; Zolfaghari Borra, Mona; Semiz, Emel; Kokbudak, Gamze; Orhan, Efe; Turan, Raşit (Wiley, 2020-11-01)
We present the feasibility of integrating substoichiometric molybdenum oxide (MoOx) as hole-selective rear contact into the production sequence of industrial scale p-type crystalline silicon (c-Si) solar cells. Thin films ...
Angular Dependence of Solar Cell Parameters in Crystalline Silicon Solar Cells Textured with Periodic Array of Microholes
Altinoluk, Serra; Kumar, Naveen; Çiftpınar, Emine Hande; Demircioglu, O.; Turan, Raşit; Vasileska, Dragica (2020-09-01)
Surface texturing is an indispensable way of increasing absorption in solar cells. In order to properly characterize the effect of texturing, the angular dependence of the incidence light should be addressed. This is parti...
Solvent selection for fabrication of low temperature ZnO electron transport layer in perovskite solar cells
Ahmadi, S. Hamideh; Ghaffarkani, Mashhood; Ameri, Mohsen; Safari, Nasser; Mohajerani, Ezeddin (Elsevier BV, 2020-08-01)
Zinc Oxide (ZnO) with an easy synthesis method, low processing temperature, and high charge carrier mobility has been considered as a proper electron transport layer (ETL) for perovskite solar cells. Herein, we investigate...
Ultra-High Precision Radiation Dosimetry via Laser Bleaching the Color Centers in Fast Recovery Optical Fiber Sensors
Ghahrizjani, Reza Taheri; Ameri, Mohsen; Jahanbakhsh, Hossein; Sadeghi, Hossein; Mohajerani, Ezeddin (Institute of Electrical and Electronics Engineers (IEEE), 2020-06-01)
High energy electromagnetic radiation or heavy charged particles are extensively used for medical treatment of certain cancers. Precise prediction or measurements of energy deposition of any types of radiation on tissue is...
Phenomenological morphology design of hybrid organic-inorganic perovskite solar cell for high efficiency and less hysteresis
Ameri, Mohsen; Ghaffarkani, Mashhood; Ghahrizjani, Reza Taheri; Safari, Nasser; Mohajerani, Ezeddin (Elsevier BV, 2020-02-01)
In this report, a modeling approach is employed to study the effect of the grain boundaries (GBs) and their electronic activity on the performance parameters of the perovskite solar cells (PSCs). Our model is based on the ...
Enhanced Passivation Properties of a-Si:H and Reactive ITO Sputtering for SHJ Solar Cells
Donercark, Ergi; Guler, Secil; Çiftpınar, Emine Hande; Kabacelik, Ismail; Turan, Raşit (2020-01-01)
Enhancement of the conversion efficiency of silicon solar cells is crucial for the improvement of renewable electricity resources. The device properties such as minority carrier lifetime, series resistance, contact resista...
Enhanced metal assisted etching method for high aspect ratio microstructures: Applications in silicon micropillar array solar cells
Baytemir, Gulsen; Çiftpınar, Emine Hande; Turan, Raşit (Elsevier BV, 2019-12-01)
A solar cell device, fabricated on high density array cylindrical pillars, enables photogenerated carrier collection in the radial direction, thus shortening the path length of the carriers reaching the junction. It also p...
Electrical, optical and surface characterization of reactive RF magnetron sputtered molybdenum oxide films for solar cell applications
Mehmood, Haris; Bektaş, Gence; Yıldız, İlker; Tauqeer, Tauseef; Nasser, Hisham; Turan, Raşit (Elsevier BV, 2019-10-01)
Thin films of molybdenum oxide (MoOx) were fabricated by radio frequency (RF) reactive magnetron sputtering technique with various oxygen flow rates and the deposition pressure fixed at 4 mTorr. The stoichiometry, composit...
A sequential condensation route as a versatile platform for low cost and efficient hole transport materials in perovskite solar cells
Pashaei, Babak; Shahroosvand, Hashem; Ameri, Mohsen; Mohajerani, Ezeddin; Nazeeruddin, Mohammad Khaja (2019-10-01)
In an effort to diminish the cost of perovskite solar cells (PSCs) with regard to hole transport materials (HTMs), we employed an easily attainable condensation route to synthesize a cheap and efficient HTM. Using a newly ...
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