Effect of deposition temperature on the properties of Cu 2 ZnSnS 4 (CZTS) thin films (original) (raw)
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Cu2ZnSnS4 (CZTS) thin films were deposited viva spray pyrolysis technique at different substrate temperature. The effect of substrate temperature on the structural, morphological, compositional and optical properties was reported. The X-ray diffraction and Raman analysis revealed that prepared CZTS thin film show kesterite phase without any secondary phases. Moreover, these analyses indicated the internal compressive stress relaxed with substrate temperature for all CZTS thin films. The homogeneous nature of CZTS thin films were observed from surface morphology and chemical composition study. The optical study provided good optical absorption (104 cm−1) in the visible region and band gap energy was decreased and found quite close to the optimum value of about 1.57 eV to 1.49 eV for solar cell application.
Deposition and Characterization of Cu 2 ZnSnS 4 Thin Films for Solar Cell Applications
2018
Copper zinc tin sulfide (CZTS) thin films have been grown on glass substrates at 400 oC by using chemical spray pyrolysis as relatively fast and vacuum-free method. The Spray solutions were prepared with different molar concentrations of copper chloride dihydrate, zinc chloride, tin chloride dihydrate while the concentration of thiourea was kept constant. The thickness of the prepared thin films was about (400 nm) measured by gravimetric method. The structural, optical and electrical properties of the prepared films have been studied using XRD, Raman spectroscopy, UV-Vis-NIR spectroscopy and Hall measurement. The crystallite size of CZTS films was estimated using Scherrer’s formula and it was found that the CZTS thin films have maximum crystallite size of (16.03 nm) at concentration ratio (Cu/(Zn+Sn)=1.4) which is related to the film (CZTS5). Williamson–Hall analysis was carried out for all samples and the crystallite size and microstrain were estimated. Raman shift measurement show...
Physical and optical properties of sprayed Cu2ZnSnS4 (CZTS) thin film: effect of Cu concentration
Journal of Materials Science: Materials in Electronics, 2019
The crystallographic microstructural and optical properties of CZTS thin film have been investigated with influence of copper concentration in spray solution. The X-ray and Raman study carried out to the prepared CZTS thin films and attained pure kesterite phase. The results of microstructural properties such as crystallite size, d-spacing, microstrain, texture coefficient and standard deviation investigated. The prepared CZTS thin film shows very high optical absorption of the order of 10 5 cm −1 in the visible region and the optical band gap energy varied between 1.45 and 1.47 eV. This optical band gap tuning is most applicable for solar cells. By using the Wemple-DiDomenico (WDD) single oscillator model, the optical parameters were calculated such as single oscillator energy (E 0), dispersion energy (E d), static refractive index (n 0), etc. Large values of optical conductivity (σ) give the promise to the solar cell application.
Solar Cells of Cu2ZnSnS4 thin films prepared by chemical bath deposition method
Solar cells based on kesterite-type Cu 2 ZnSnS 4 have been successfully fabricated on ITO substrates by cost effective chemical bath deposition method. The structural properties of the material have been studied using X-ray diffraction pattern and it confirms the formation of Cu 2 ZnSnS 4 with kesterite structure. The surface topography has been studied using atomic force microscope and the rms roughness of the film was found to be 3.2 nm. The chemical constituents present in the prepared films have been identified using energy dispersive X-ray analysis. The optical band gap energy of CZTS thin film was found to be 1.5 eV which is quite close to the optimum value required for solar cell application. The power conversion efficiency of fabricated Cu 2 ZnSnS 4 based solar cell is 1.34%.
Superlattices and Microstructures, 2015
Please cite this article as: A. Sagna, K. Djessas, C. Sene, M. Belaqziz, H. Chehouani, O. Briot, M. Moret, Growth, structure and optoelectronic characterizations of high quality Cu 2 ZnSnS 4 thin films obtained by close spaced vapor transport, Superlattices and Microstructures (2015), doi: http://dx.ABSTRACT High quality Cu 2 ZnSnS 4 (CZTS) thin films, as an absorber layer for thin films solar cell, were synthesized successfully using a simple and low cost technique, Close-Space Vapor Transport (CSVT). The films were grown on soda-lime glass substrates using a polycrystalline CZTS ingot as source of evaporation material. Influence of substrate temperature on chemical composition, morphological, structural, electrical and optical properties of the CZTS thin films was investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Raman spectroscopy, UV-Vis-NIR spectrophotometer, Hall effect and photoluminescence (PL) measurements. The results from XRD and Raman characterization confirmed the formation of kesterite CZTS thin films with a (112) plane preferred orientation and Raman shift of 338 cm -1 ,
Cu2ZnSnS4(CZTS) thin films was potentiostatically deposited on molybdenum coated glass substrates using the electrochemical deposition method As-deposited and annealed in furnace, The polycrystalline CZTS thin films with tetragonal crystal structure have been studied from structural analysis results , XRD and Raman spectroscopy results show these thin films exhibit a strong preferential orientation along the (112), The energy gap of Cu2ZnSnS4 was estimated to be 1.8 eV via ultraviolet-visible (UV-vis) absorption spectrum of Cu2ZnSnS4 which suggests that CZTS films Can be useful as an absorber layer in thin film solar cells.
Deposition of Cu 2 ZnSnS 4 (CZTS) prepared by a solution route for solar cells applications
As a promising candidate as absorber layer in thin film solar cells, the Cu 2 ZnSnS 4 (CZTS) material has gained a broad interest over recent years for the production of low-cost solar cells due to its direct and tunable band gap energy, high optical absorption coefficients and also due to the abundance and the non-toxicity of all its constituents. In addition, to solve the problem of expensive and complicated vacuum-based synthesis methods, simple and low-cost methods have been developed for the preparation of this material. In this present work, the CZTS thin films have been prepared using a solution route namely sol-gel, which is a simple and low cost method for a large production of thin films materials and spin coated onto glass substrates. The sol-gel precursor solution was made from metal salts of copper (II) chloride (CuCl 2), zinc (II) chloride (ZnCl 2), Tin (IV) chloride (SnCl 4), and thiourea (CS (NH 2) 2) dissolved into a mixture of ethanol/water as solvent. The X-ray diffraction studies showed the formation of a kesterite structure with peaks corresponding to (112) and (220) directions. The Raman spectrum indicated the presence of the principal kesterite peak at 336 cm-1 and the existence of a strange peak at 424 cm-1 which could be attributed to the binary compound Cu 2 S. The absorbance spectrum has been recorded for the estimation of the band gap. The CZTS thin film can be made using a simple spin coating technique, but improvements in the film properties by a suitable annealing time and temperature as well as annealing environment and post deposition needs have to be done for making a quality photovoltaic absorber.
Synthesis and characterization of Cu2ZnSnS4 thin films grown by PLD: Solar cells
Journal of Alloys and Compounds, 2011
As-deposited and annealed Cu 2 ZnSnS 4 (CZTS) thin films have been synthesized onto Mo coated glass substrates at different deposition times using pulsed laser deposition (PLD) technique. The effect of deposition time (film thickness) and annealing onto the structural, morphological, compositional and optical properties of CZTS thin films have been investigated. The polycrystalline CZTS thin films with tetragonal crystal structure have been observed from structural analysis. FESEM and AFM images show the smooth, uniform, homogeneous and densely packed grains and increase in the grain size after annealing. The internal quantitative analysis has been carried out by XPS study which confirms the stoichiometry of the films. The optical band gap of CZTS films grown by PLD is about 1.54 eV, which suggests that CZTS films can be useful as an absorber layer in thin film solar cells. Device performance for deposited CZTS films has been studied.
Effect of Increasing Concentrations on Sprayed Cu2ZnSnS4 Thin Films
djelloul, 2019
Spray pyrolysis is a simple and low cost technique used for large thin films fabrication. In this paper, we reported the preparation of Cu2ZnSnS4 (CZTS) thin films with spray pyrolysis on glass substrates using different aqueous solutions. So, we chose to vary anions (S) and cations (Cu, Zn, Sn) concentrations. The purpose of this choice is the EDX analysis so that the percentage of copper is closer to 25 %; on the other hand, zinc and tin are around 12.5 % and sulfur at 50 %. The structural, chemical composition, morphological and optical properties of CZTS thin films were investigated using X-ray diffraction (XRD) and Raman spectroscopy, energy dispersive X-ray analysis (EDAX), scanning electron microscopy (SEM) and atomic force microscopy (AFM), and UV-visible spectroscopy analysis, respectively. The X-ray diffraction showed the formation of kesterite structure with dominant peaks along (112), (220) and (312) directions. Raman spectroscopy confirmed the existence of internal compressive stress in the CZTS thin films. The EDX analysis showed a better stoichiometry when optimizing the precursor concentrations. CZTS thin films showed low optical transmission and optical absorbance higher than 5×10 4 сm-1 , which make the CZTS thin films prepared by spray pyrolysis technique suitable for CZTS solar cells.