Center for Solar Energy Research and Applications (GÜNAM), Article

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Journal Article (33)

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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...
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 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...
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 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 ...
Alternative HF-free etching solution for aluminum induced texturing of glass surface with improved haze
Ünal, Mustafa; Turan, Raşit (IOP Publishing, 2019-08-01)
Aluminum induced texturing (AIT) is a promising surface conditioning method applied on glass substrates. In conventional AIT process, the reaction products (i.e., Al2O3 and Si) are stripped off the glass surface using an H...
The investigation of the unseen interrelationship of grain size, ionic defects, device physics and performance of perovskite solar cells
Ameri, Mohsen; Mohajerani, Ezeddin; Ghafarkani, Mashhood; Safari, Nasser; Alavi, S. Ali (2019-03-01)
Controlling the phenomenological morphology effects on the performance of the perovskite solar cell (PSC) is a continuing concern due to its photo-physical complexity and the existing contrary reports. Distinguishing the e...
Role of Stabilizing Surfactants on Capacitance, Charge, and Ion Transport in Organic Nanoparticle-Based Electronic Devices
Ameri, Mohsen; Al-Mudhaffer, Mohammed F.; Almyahi, Furcian; Fardell, Georgia C.; Marks, Melissa; Al-Ahmad, Alaa; Fahy, Adam; Andersen, Thomas; Elkington, Daniel C.; Feron, Krishna; Dickinson, Michael; Samavat, Feridoun; Dastoor, Paul C.; Griffith, Matthew J. (2019-03-01)
Deposition of functionalized nanoparticles onto solid surfaces has created a new revolution in electronic devices. Surface adsorbates such as ionic surfactants or additives are often used to stabilize such nanoparticle sus...
Mechanical and optical properties of SiO2 thin films deposited on glass
Simurka, Lukas; Ctvrtlik, Radim; Tomastik, Jan; Bektaş, Gence; Svoboda, Jan; Bange, Klaus (2018-09-01)
The optical and mechanical properties of amorphous SiO2 films deposited on soda-lime silicate float glass by reactive RF magnetron sputtering at room temperature were investigated in dependence of the process pressure. The...
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