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Bu çalışmada, hazırlanan niobyum pentoksit (Nb2O5) çözeltileri farklı sürelerde ve aynı koşullar altında yaşlandırıldı. Nb2O5 ince filmler, soda kireç cam ve silisyum alttaşlar üzerine aynı koşullar altında döndü-rerek kaplama cihazında sol-jel yöntemi ile kaplandı. Kaplanan Nb2O5 ince filmlerin yapısal ve optik özel-likleri ile yüzey morfolojilerinin çözeltinin yaşlanmasına olan bağımlılığı sırasıyla, X-ışını kırınımı (XRD), ikincil iyon kütle spektrometresi (SIMS), UV-Vis spektrofotometre ve atomik kuvvet mikroskobu (AFM) analizleri ile incelendi. XRD sonuçlarından, SG-1 (1 gün yaşlandırılan çözelti ile kaplanan film) numunesi-nin kristal yapıya sahip olduğu görüldü ve SG-1 numunesinin tanecik boyutu 46,12 nm olarak hesaplandı. SIMS analizi ile niobyum (Nb) ve oksijen (O) atomik türlerinin film derinliği boyunca homojen olarak dağıldığı tespit edildi. SG-1 numunesi görünür bölgede %80 civarında geçirgenliğe sahiptir ve soğurma spektrumundan elde edilen yasak enerji aralığı yaklaşık 3,65 eV olarak bulundu. Çözeltilerin yaşlandırılma süreleri artıkça, yansıtma değerleri kullanılarak hesaplanan kırılma indislerinin azaldığı görülmektir. AFM sonuçlarından, 5x5 µm2’lik alanda taranan yüzey görüntülerinden SG-1 numunesinin düzgün yüzey mor-folojisine ve 70 nm tanecik büyüklüğüne sahip olduğu görülmektedir. Ayrıca, AFM görüntülerinden çözelti yaşlandıkça RMS değerlerinin artığı görülmektedir. Elde edilen sonuçlar; Nb2O5 çözeltisinin yaşlandırılma süresinin kaplanan filmlerin yapısal, optik ve yüzey morfolojisini etkilediğini göstermektedir. Kaplanan Nb2O5 ince filmlerin Si temelli güneş hücrelerinde yansıma önleyici tabaka olarak kullanılması önerilmektedir.
In this study, prepared niobyum pentoxide (Nb2O5) solutions were aged at different times and under the same conditions. Nb2O5 thin films turned on the same circumstances on the soda clay glass and silicon substrate-covered with the left-gel method in the rope cutting device. The structure and optical characteristics of covered Nb2O5 thin films and the ageing dependency of the solution of surface morphologies, respectively, were studied by X-ray breakdown (XRD), secondary ion mass spectrometry (SIMS), UV-Vis spectrometry and atomic power microscope (AFM) analysis. The XRD results showed that the SG-1 sample (a film covered with a day old solution) had a crystal structure and the SG-1 sample's thin size was calculated at 46.12 nm. Sims analysis found that niobyum (Nb) and oxygen (O) atomic species were homogeneously distributed throughout the film depth. The SG-1 sample has about 80% passiveness in the visible area and the prohibited energy range from the cooling spectrum was found at approximately 3.65 eV. The ageing periods of solutions are increasing, and it is seen that the breakdown indicators calculated using reflective values are reduced. From the AFM results, from the surface images scaned in an area of 5x5 μm2 it is shown that the SG-1 sample has a correct surface mor-phology and a tank size of 70 nm. Furthermore, the solution from AFM images is seen increasing the RMS values as it ages. The results show that the ageing period of the Nb2O5 solution affects the structural, optical and surface morphology of the covered films. Covered Nb2O5 thin films are recommended to be used as a reflection preventive layer in Si-based solar cells.
In this study, prepared niobium pentoxide (Nb2O5) solutions were aged for different times and under the same conditions. Nb2O5 thin films were deposited on the soda lime glass and silicon (Si) substrates under the same conditions by sol-gel spin coating method. The structural and optical properties and surface morphologies of the coated Nb2O5 thin films depending on the solution ageing were investigated by X-ray diffraction (XRD), secondary ion mass spectrometry (SIMS), UV-Vis spectrometer and atomic force mi-croscopy (AFM) analyzes, respectively. XRD results indicated that SG-1 sample (the film deposited using 1-day aged solution) had crystal structure and the particle size of the SG-1 sample was calculated as 46.12 nm. It was determined by SIMS analysis that the niobium (Nb) and oxygen (O) atomic species distributed homogeneously along the film depth. The SG-1 sample had 80% optical transmittance in the visible region and the energy band gap from the absorption spectrum was found to be about 3.65 eV. It was seen from the AFM surface images scanned in 5x5 µm2 area that SG-1 sample had smoother surface morphology with particle size value calculated as 70 nm. Also, it was seen from the AFM images that the RMS values increase as the solution ageing. The obtained results showed that the ageing time of Nb2O5 solution affects the structural, optical and surface morphology of the deposited films. It is suggested that the coated Nb2O5 thin films should be used as antireflective layer in crystal Si based solar cells.
Dergi Türü : Uluslararası
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