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Short-chain ligand assisted synthesis of CH3NH3PbX3 (X = Cl, Br, I) perovskite quantum dots and improved morphology of CH3NH3PbBr3 thin films
摘要： Employing the short-chain C4H9NH3X (X = Cl, Br, I) compound as the unique capping agent, highly quality CH3NH3PbX3 (X = Cl, Br, I) perovskite quantum dots can be synthesized at room temperature in the open air, which possess high photoluminescence quantum yields and tunable emission in the range of 440-660 nm. Besides, C4H9NH3Br can also improve the morphology of CH3NH3PbBr3 thin films by spin-coating the N, N-dimerthylformamide solution of CH3NH3Br, C4H9NH3Br and PbBr2, making the thin film dense and compact, and improving its optical properties.
关键词： quantum dots,Perovskite,CH3NH3PbX3(Cl, Br, I),photoluminescence spectra,morphology
更新于2025-11-14 17:04:02
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Application of ZnxLayFezO4 spinel nanomaterial in quantum dot sensitized solar cells
摘要： A novel inorganic spinel nanomaterial with formula Zn0.6093La1.3979Fe0.8650O4 (ZLF) was synthesized and characterized by the X-ray photoelectron spectroscopy (XPS) to determine its stoichiometric formula. The Filed-Emission Scanning Electron Microscopy (FE-SEM) and Transmission Electron Microscopy (TEM) images displayed that the ZLF nanoparticles (NPs) had a very fine spherical morphology and average particle sizes in the range of about 5–30 nm. Quantum dot-sensitized solar cells (QDSSCs) were fabricated using the ZLF NPs which were incorporated into the TiO2 pastes of photoanodes. The photoluminescence (PL) spectra of the ZLF NPs and the photoanodes exhibited three maxima plus a weak broad peak at around 420, 460 and 485 plus 530 nm. The lowest intensity of the PL peak for the CdSe cell fabricated using 0.4 %ZLF suggested that it had the least charge recombination and the easiest electron transfer. The photovoltaic parameters of the optimized champion cell containing 0.4 % of ZLF NPs (η = 3.50 %, JSC = 13.11 mA/cm2, VOC = 0.58 V) were boosted compared to those of the ZLF-free reference cell (η = 2.18 %, JSC = 8.70 mA/cm2, VOC = 0.57 V) demonstrating a high improvement of approximately 61 % in the efficiency. The Electrochemical Impedance Spectra (EIS) revealed that the charge transfer resistance (RCT) in the optimum cell was dropped by adding the ZLF NPs into the TiO2 compared to that of the reference ZLF-free cell. Thus, upon adding 0.4 %ZLF, appropriate photocurrent efficiency was attained for the QDSSC because the ZLF nanoparticles were used in a minimum amount in order to speed up the electron transport, decline the recombination and enhance the cell efficiency.
关键词： Photoluminescence spectra,Spectra,ZnLaFeO4nanoparticles,Quantum dot sensitized solar cells,Electrochemical impedance (EIS),XPS
更新于2025-09-23 15:19:57
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Tuning the optical properties of ZnO:Cd by doping La and Y
摘要： Zinc oxide doped with Cadmium and rare earth elements synthesized by solgel auto combustion route is reported in this work. The studies have been carried out to analyze the structural, morphological and optical properties of Cd doped ZnO and rare earth doped ZnCdO. The XRD analysis reveals that the addition of rare earth impurity decreases the particle size of ZnCdO. La doped ZnCdO has the least particle size among the samples of ZnCdO and rare earth doped ZnCdO. The morphological changes due to the addition of rare earth impurities have been found. Samples of La doped ZnCdO shows a pillar like morphology. The hexagonal structures are prominently seen in the SEM micrographs of the samples of ZnCdO. The UV-Visible spectral analyses show that the bandgap reduces when ZnCdO is doped with the rare earth impurities. The photoluminescence spectra show the broad spectrum in visible region exhibited by ZnO and a scanty UV emission. The UV emission of rare earth doped samples decreases due to the destruction in the crystal structure. The rare earth doped ZnCdO shows a small peak in green emission that decreases when rare earth impurities are doped. There is a uniform spectral response other than a small Gaussian like green peak. The overall analyses show that the samples can be used in optoelectronic applications to work in the visible region.
关键词： rare earth elements,structural properties,optical properties,UV-Visible spectral analyses,Cadmium,SEM micrographs,photoluminescence spectra,XRD analysis,Zinc oxide,solgel auto combustion,morphological properties
更新于2025-09-09 09:28:46