Polimerik Güneş Hücrelerinde Ag Nanopartikül Katkılı TiO2 Tampon Tabakasının Kendiliğinden Organize Olan Tek Tabaka Moleküller (SAM) ile Modifiye Edilmesi

Organik güneş hücrelerinin performansları üzerinde yüzey modifikasyonu ve metal nanopartiküller önemli bir rol oynamaktadır. Tek tabaka kendiliğinden organize olan (self assembly monolayer, SAM) organik malzemeler ucuz ve kolay uygulanabilir olmaları nedenleriyle diğer yüzey uygulama tekniklerine alternatif bir malzemelerdir. Metal nanopartiküllerin organik güneş hücrelerinde uygulama alanlarının geliştirilmesi son yıllarda önemli bir başlık haline gelmiştir. Bu çalışmada, sol-jel yöntemi ile sentezlenen TiO2 elektrot yapısına Ag np’ler katkılanmış ve Ag-/TiO2 yüzeyi SAM molekülü ile modifiye edilerek yeni bir tür elektrot tasarlanmıştır. TiO2 elektrotlu güneş hücresinde elde edilen verimlilik değeri % 2,25 iken, bu çalışmada tasarlanan Ag-TiO2/SAM elektrot yapısından elde edilen güneş hücre verimliliği % 2,84 olarak bulunmuştur

Energy efficiency improvement of the heat pump by employing synthesized CuO/ZnO hybrid nanofluid

WOS:000729464600001In this experimental study, CuO/ZnO hybrid nanoparticles were synthesized by the co-precipitation method. While solid nanoparticles were synthesized, 5%, 10%, and 15% mass fractions of CuO were doped into ZnO nanoparticles. While preparing the nanofluids, sodium dodecyl benzene sulphonate (SUBS) surfactant material was used to prepare a homogeneous and hydrophobic suspension. The results of physical and chemical analyses of the synthesized nanoparticles were examined. In the experiments made with the heat pump, the coefficient of performance (COP) of the heat pump was calculated as 4.23 when deionized water was used as the working fluid. In the experiments with nanofluids using ZnO and 15% (wt./wt.) CuO/ZnO instead of deionized water, COP values of 4.31 and 4.44 were obtained, respectively

The impacts of synthesized Ag doped ZnO nano-materials on the energy efficiency of the refrigeration system

WOS:000787868000001Nanofluids are used to increase thermal performance in various applications of heat transfer. In the present study, to increase the performance of the cooling system, nanolubricant prepared with zinc oxide (ZnO) and silver (Ag) doped ZnO nanoparticles were used. ZnO and Ag/ZnO nanoparticles were synthesized via precipitation and co-precipitation methods, respectively. The effects of Ag particles added to ZnO nanoparticles at the rate of 5% on thermal performance were investigated. XRD and SEM examinations of the synthesized nanoparticles were made in detail and their suitability was determined. Nanolubricants were prepared by mixing 0.5% and 1.0% (wt./wt.) ZnO or Ag/ZnO and 0.5% (wt./wt.) Tween 80 (T80). The coefficient of performance (COP) values maximum increased by 18.20% and 23.68%, respectively, in the use of mineral oil with added 1.0% ZnO and 1.0% Ag/ZnO nanoparticles in the nanolubricants. In the cooling system, the compressor work decreased by 18.71% using the nanolubricant prepared with Ag-doped ZnO hybrid nanoparticles at a 1.0% mass fraction

The effect of Ag nanoparticle doping to active layer on photovoltaic efficiency of organic solar cell

Organik güneş hücreleri alternatif enerji kaynaklarından bir tanesidir. Bu teknolojinin ticarileşebilmesinin önündeki tek engel düşük verimlilik değerleridir. Bu çalışmada evrik yapıdaki organik güneş hücrelerinin verimi Ag nanopartiküllerin (np) plazmonik etkilerinden yararlanarak arttırılmıştır. Aygıt konfigürasyonu ITO/ZnO/poli(3-hekziltiofen-2,5-diil) (P3HT): (6,6)-fenil C61 bütirik asit metil ester (PCBM)/MoO3/Ag şeklindedir. Ag np’ler poliol yöntemi ile sentezlenmiş ve X-Işını difraktometresi (XRD) UV-Vis spektrofotometre ve alan emisyonlu taramalı elektron mikroskopu (FESEM) ile karakterize edilmiştir. Daha sonrasında Ag, kütlece %0,125-0,25-0,5 oranlarında P3HT:PCBM’e katkılanmıştır. Referans hücrede verim değeri %3,21 iken %0,25 Ag katkılı aygıtta yaklaşık %7’lik bir verim artışı ile %3,43 değerine ulaşılmıştır.Organic solar cells are one of the alternative energy sources. The only barrier to commercialization of this technology is its low efficiency values. In this study, the efficiency of inverted organic solar cells was increased by utilizing the plasmonic effects of Ag nanoparticles (np). The device configuration is ITO/ZnO/poly(3- hexylthiophene-2,5-diyl) (P3HT):(6,6)-phenyl C61 butyric acid methyl ester (PCBM)/MoO3/Ag. Ag np’s were synthesized by polyol method and characterized by X-Ray diffractometry (XRD), Uv-Vis spectrophotometer and field emission scanning electron microscopy (FESEM). Afterwards, Ag was added to P3HT:PCBM at the ratios of 0.125-0.25-0.5% by mass. While the efficiency value was 3.21% in the reference cell, it reached 3.43% with an increase of approximately 7% in the 0.25% Ag added device

Effect of Au nanoparticle doped ZnO buffer layer on efficiency in organic solar cells

WOS:000980161000001Although organic solar cells have great potential, there is a need to increase their efficiency values. In this study, ITO/ZnO/P3HT:PCBM/MoO3/Ag structure was used and it was aimed to increase the efficiency by adding different percentages of Au nanoparticles (nps) into the ZnO electron transport layer. According to the best results, adding 10% (V/V) Au into ZnO increased the power conversion efficiency from 2.94% to 3.48%. Thus, efficiency increase of nearly 20% was achieved. The main reason for the increase in efficiency is the increase in current density by utilizing the plasmonic effects of Au nps. While the current density was 8.14 mA/cm2 in the device without Au nps, the 10% Au doping increased to 8.58 mA/cm2 in the device

Effect of ZnO concentration on efficiency in organic solar cells

Bu çalışmada, sol-jel yöntemi ile sentezlenmiş ZnO molaritesinin P3HT (Poli (3-hekzil tiyofen)):PCBM ((6,6) Fenil-C61-Bütirik asit metil ester) aktif tabakalı güneş hücresinde verime olan etkisi incelenmiş ve 0,1, 0,3 ve 0,5 M değerlerinde çalışılmıştır. Aygıtların verim değerleri, 100 mw/cm2 güneş ışıması altında Keithley 2400 kaynak ölçer cihazı yardımı ile belirlenmiştir. Ayrıca XRD, UV-Vis ve FESEM teknikleri ile karakterizasyon işlemleri gerçekleştirilmiştir. Yapılan çalışmalar sonrasında 0,1 M sentez konsantrasyonunun, en uygun koşul olduğu bulunmuş ve bu şartlarda üretilen aygıt ile %3,09 verime ulaşılabildiği tespit edilmiştir.In this study, the effect of the molarity of ZnO synthesized by the sol-gel method on the efficiency of P3HT (Poly (3-hexyl thiophene)):PCBM ((6,6) Phenyl-C61-Butyric acid methyl ester) active layer solar cell was investigated. It was studied at 0.1, 0.3 and 0.5 M values. The efficiency values of the devices were determined with the Keithley 2400 source meter under 100 mw/cm2 solar radiation. In addition, characterization processes were carried out with XRD, UV-Vis and FESEM techniques. After the studies, it was found that 0.1 M synthesis concentration was the most suitable condition and it was determined that 3.09% efficiency could be reached with the device produced under these conditions

The effect of ZnO synthesized by different methods on efficiency in organic solar cells

Bu çalışmada ITO/ZnO/P3HT:PCBM/MoO3/Ag yapısına sahip güneş hücresi üretilmiş olup farklı yöntemlerle sentezlenmiş olan ZnO’in aygıt verimi üzerindeki etkisi incelenmiştir. Sentez yöntemi olarak, sol-jel, nanokristal ve çözelti prosesi kullanılmıştır. Öncelikle her bir farklı sentez yöntemi için XRD ile karakterizasyon yapılmıştır. Daha sonrasında ise elde edilen ZnO çözeltileri ile kaplamalar yapılarak aygıtlar üretilmiştir. Yapılan aygıtların verim değerleri, 100 mw/cm2 güneş ışıması altında Keithley 2400 kaynak ölçer cihazı yardımı ile belirlenmiştir. Elde edilen bulgulara göre en yüksek verime (%2,90) sol-jel yöntemiyle sentezlenen ZnO ile ulaşılmıştır. Ayrıca sol-jel yönteminin, diğer yöntemlere göre daha ucuz ekipmanlara ve nispeten zararsız kimyasallara gereksinim duymasından dolayı ekstra avantajları vardır. Sonuç olarak organik güneş hücrelerinde kullanılacak olan ZnO için en uygun sentez yöntemi sol-jel yöntemi olduğu belirlenmiştir.In this study, a solar cell with ITO/ZnO/P3HT:PCBM/MoO3/Ag structure was produced. Then, the effect of ZnO, which was synthesized with different methods, on device efficiency was investigated. As the synthesis method, solgel, nanocrystal and solution processes were used. First of all, XRD characterization has been made for each different synthesis method. Later, the devices were produced by coating with the obtained ZnO solutions. The efficiency of the devices was determined under 100 mw/cm2 solar irradiance using Keithley 2400 sourcemeter. According to the obtained findings, the highest efficiency (2.90%) was achieved with ZnO synthesized by sol-gel method. In addition, the sol-gel method has extra advantages as it requires cheaper equipment and relatively harmless chemicals compared to other methods. As a result, it was determined that the most suitable synthesis method for ZnO to be used in organic solar cells is the sol-gel method

Vapor deposition of poly(hexafluorobutyl acrylate) nanocoating for encapsulation of organic solar cells

The biggest problem of organic photovoltaics is their quickly deterioration in atmospheric conditions. O2 and moisture in the air affect device performance negatively. In this study, at first, it is determined which electrical parameter used in the device efficiency calculation is affected by atmospheric conditions. For this context, produced devices were kept in room conditions, desiccator, and glovebox, respectively. Stability tests were performed for 8 weeks. According to the results, predominantly, current density (Jsc) is affected by O2, open circuit voltage (Voc) is affected by moisture while fill factor (FF) is affected by both O2 and moisture. Normalized efficiency (η) values are decreased, the devices kept in room conditions, desiccator, and glovebox, 90 %, 60 %, and 20 %, respectively. In the second part, devices were encapsulated with poly(Hexafluorobutylacrylate) (PHFBA) using batch initiated chemical vapor deposition (iCVD) technique at varying thicknesses. FTIR and XPS studies revealed successful PHFBA polymerization coatings. Efficiency losses for encapsulated devices was measured as between 30 and 35 %. When the non-encapsulated and encapsulated devices kept under room conditions were compared, the reductions in efficiency were found to be 90 % versus 30 %. According to the results, PHFBA has good barrier properties against O2 and moisture

Modification of ag nanoparticle doped tio2 buffer layer with self assembly monolayer (SAM) molecule in polymer solar cell

Organik güneş hücrelerinin performansları üzerinde yüzey modifikasyonu ve metal nanopartiküller önemli birrol oynamaktadır. Tek tabaka kendiliğinden organize olan (self assembly monolayer, SAM) organik malzemelerucuz ve kolay uygulanabilir olmaları nedenleriyle diğer yüzey uygulama tekniklerine alternatif birmalzemelerdir. Metal nanopartiküllerin organik güneş hücrelerinde uygulama alanlarının geliştirilmesi sonyıllarda önemli bir başlık haline gelmiştir. Bu çalışmada, sol-jel yöntemi ile sentezlenen TiO2 elektrot yapısınaAg np’ler katkılanmış ve Ag-/TiO2 yüzeyi SAM molekülü ile modifiye edilerek yeni bir tür elektrottasarlanmıştır. TiO2 elektrotlu güneş hücresinde elde edilen verimlilik değeri % 2,25 iken, bu çalışmadatasarlanan Ag-TiO2/SAM elektrot yapısından elde edilen güneş hücre verimliliği % 2,84 olarak bulunmuştur.Surface modification and metal nanoparticles, play an important role on the performance of organic solar cell. Organic materials of self assembly monolayer (SAM) is a alternative material to other surface application techniques due to their cost effective and easy processing. The development of application area of metal nanoparticles, have become an important issue in organic solar cells. In this study, TiO2 electrode, synthesized by sol-gel method, was doped with Ag np's and a novel electrode was designed by modification Ag-TiO2 surface with SAM. While the efficiency of organic solar cell with TiO2 electrode was obtained as 2,25%, the value of efficiency was found as a 2,84% by the use of designed Ag-TiO2/SAM electrode

Influence of end groups variation of self assembled monolayers on performance of planar perovskite solar cells by interface regulation

WOS:000604244800006We present the synthesis and application of new class of self-assembled monolayer molecules (SAMs) for acquiring feasible interfacial engineering in inverted type perovskite solar cells (PSCs). The proposed SAMs bearing different electron donating terminal groups have been utilized to tune the work function of indium tin oxide (ITO) electrodes. Fine-tuning of terminal groups of the SAMs allows us to compare relationship between molecular structures and device parameters. Moreover, ionic and hybrid nature of perovskite enables forming various chemical interactions with terminal groups of SAMs. Employed SAMs has resulted in permanent increase in work function of ITO, increase power conversion efficiency (PCE) of the cells and passivation of trap states at the interface between electrode and perovskite layer. The present study provides new insights into correlation between molecular engineering and solar cell performance through treating holistic comparison of synthesized molecules at the interface of ITO and perovskite layer. © 2020 Elsevier Lt