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Preparation of NiO/TiO2 Composite Films for Enhanced Dye Sensitized Solar Cell Efficiency
摘要： Spray pyrolysis technique has been applied for preparing many kinds of thin films because this technique offers a lot of advantages, such as inexpensive cost, uncomplicated process and large scale production. Therefore, the spray pyrolysis technique is used for making pure TiO2 and NiO/TiO2 composite films in this report. A NiO/TiO2 composite film is getting attention to be used as a compact layer in dye sensitized solar cell (DSSC) because NiO can be used as a hole collector and a barrier for energy recombination properties. Moreover, the NiO/TiO2 composite film exhibits superhydrophilic properties that can increase absorption efficiency for a dye solution. This study has an objective to improve the efficiency of DSSC by changing the ratio of NiO/TiO2 in the composite films. The pure TiO2 and NiO/TiO2 composite films were prepared at 200℃ by spray pyrolysis technique using a Ti(OCH(CH3)2)4 solution and a mixture of Ti(OCH(CH3)2)4 solution with Ni(NO3)2?6H2O powder, respectively. The effect of the ratio between Ni(NO3)2?6H2O powder and Ti(OCH(CH3)2)4 solution (0.5 atm%, 1 atm%, 2 atm%, and 4 atm% of Ni(NO3)2?6H2O) on the efficiency of DSSCs were studied. The surface morphology, crystal structure and optical properties of TiO2 and NiO/TiO2 composite films on FTO and glass substrates were characterized by using field-emission scanning electron microscope (FE-SEM), X-ray diffractometer (XRD), and UV-VIS spectrophotometer, respectively. The FE – SEM images showed that the films were smooth surface and dense when prepared at 200 ℃. The XRD results of TiO2 and NiO/TiO2 composite films on the FTO substrates showed that the TiO2 crystals were anatase phase because the peak at 25.30 corresponds to (101) planes of anatase. The spectrophotometer results showed that the optical transmittance for all samples were about 80%. For the energy conversion efficiency characterization, it was found that the NiO/TiO2 composite films that were prepared from 0.5 atm% of Ni(NO3)2?6H2O solution had the better energy conversion efficiency than TiO2 films.
关键词： NiO/TiO2 composite film,Dye sensitized solar cell,Spray pyrolysis technique
更新于2025-09-23 15:21:01
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[IEEE 2020 IEEE Latin America Electron Devices Conference (LAEDC) - San Jose, Costa Rica (2020.2.25-2020.2.28)] 2020 IEEE Latin America Electron Devices Conference (LAEDC) - New Deposition Technique for Inverted Polymer Solar Cells Using ZnO-ETL
摘要： In this research work, efficient inverted polymer solar cells (iPSCs) were fabricated for the first time using simple and low cost spray pyrolysis (SP) technique to deposit ZnO thin film as electron transporting layer (ETL) with the structure of ITO/ZnO/PTB7-Th: PC70BM/V2O5/Ag. The effect of the different number of running cycles with the SP technique on the iPSC performance has been investigated. In addition, a state of the art for iPSCs fabricated by spin coating technique has been used as reference. In the spray pyrolysis technique, ZnO thin films were fabricated by spraying the ZnO precursor solution onto the pre-heated ITO substrate. Two different numbers of running cycles of ZnO were performed, namely, 15R and 20R. By increasing the running cycles of the sprayed ZnO film, the fill factor and the power conversion efficiency were enhanced by 20% and 32 %, respectively. This improvement might be attributed to enhancing the roughness with compacted film formation and the matched band gap between the active layer (PTB7-Th: PC70BM) and the ZnO-ETL. Hence, this promising spray pyrolysis technique might facilitate the commercialization of polymer solar cells based on mass production besides the possibility of improving its efficiency.
关键词： Polymer solar cells,Spray pyrolysis technique,Zinc Oxide deposition,Electron transporting layer
更新于2025-09-23 15:19:57
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Effect of Mg dopant on SnO <sub/>2</sub> thin films grown by spray pyrolysis technique
摘要： The undoped and magnesium (Mg)-doped Tin (IV) oxide (SnO2) thin films were grown on glass substrate by spray pyrolysis technique. In order to observe the effect on the optical, structural, morphological, and hydrogen (H2) gas answer properties of SnO2 by Mg doping, X-ray diffractometer (XRD), ultraviolet–visible (UV) spectrometer, scanning electron microscope (SEM) and hydrogen (H2) gas, measurements were taken. The absorption measurements of undoped and Mg-doped SnO2 thin films demonstrated that band gaps varied with the changing Mg dopant ratio and this variation may be from Burstein–Moss (BM) effect. XRD measurements showed that the samples were tetragonal structures and have (110), (101), (200), (211), (220), (310) planes. The surface morphology of SnO2 showed that samples was affected considerably by Mg dopant. The H2 gas sensor response improves with the increase of 1%, 2% and 3% Mg doping ratio in SnO2.
关键词： H2 sensor.,Mg-doped SnO2,spray pyrolysis technique
更新于2025-09-19 17:15:36
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Effect of Cadmium Dopant on Structure and Optical Properties of ZnO Thin Films Prepared by Spray Pyrolysis Technique
摘要： Effect of Cadmium Dopant on Structure and Optical Properties of ZnO Thin Films Prepared by Spray Pyrolysis Technique
关键词： Spray Pyrolysis Technique,Optical Properties,ZnO Thin Films,Cadmium Dopant
更新于2025-09-10 09:29:36
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Growth and Structural Properties of Graphene Oxide Thin Film with Spray Pyrolysis Technique
摘要： The spray pyrolysis technique (SPT) is one of the most useful and simple methods to grow graphene oxide (GO) thin film. Good-quality GO thin films were fabricated by spray coating with GO powder (prepared by the modified Hummers method) on glass substrates. Raman spectroscopy, Field Emission Scanning Electron Microscope (FESEM), X-ray diffraction (XRD) analysis, and UV–visible spectroscopy were done to observe the presence of functional groups in the growth thin films and to determine the structure of GO. From the result of XRD test, the GO demonstrates peak at 10.58°(2θ), while the Raman spectroscopy reveals the presence of two prominent peaks, known as D and G bands, as well as 2D band. The ID/IG ratio for spray-deposited GO film was calculated with the value of 0.84. FESEM images showed that the glass substrates were completely covered by GO at different magnifications with a sheet-like structure. The optical absorption of graphene oxide was also observed at a wavelength rang of 275-350 nm.
关键词： Graphene Oxide,Thin Film,Spray Pyrolysis Technique,Structural Properties
更新于2025-09-04 15:30:14