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Sythesis of Cu2ZnSnS4Series Nanocrystals and Its Propertis

Author: WangZuo
Tutor: XiangWeiDong
School: Wenzhou University
Course: Applied Chemistry
Keywords: solution method nanocrystals AIS ZIS CZTS kesterite wurtzire
CLC: TB383
Type: Master's thesis
Year: 2012
Downloads: 132
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Abstract


It will be realized that new materials are designed and brought intonew application field since nanocrystals semiconductors possess uniquephotoelectric properties. Particularly, as new energy materials,nanocrystals semiconductors are widely used in solar cells, light-emittingdiode and nonlinear optical and so on, which draw immense interest.AgInS2（AIS）, Zn2InS4（ZIS） and Cu2ZnSnS4（CZTS） are all importantphotoelectric semiconductors, which are potential applied in solar cellsand nonlinear field. Meanwhile, AIS, ZIS are both fluorescencesemiconductors materials so that can be used in light-emitting diode.Hence, those have been a focus for researchers.In our present, AIS, ZIS, CZTS nanocrystals are synthesized bysimple solution-based method which is similar hot injection. Thecomposition, structure, morphology and properties of the CZTS werecharacterized by X-ray diffraction （XRD）, energy dispersive X-ray （EDS）,transmission electron microscopy （TEM） and high-resolution transmissionelectron microscopy （HRTEM） and UV-vis, fluorospectrophotometer and Z-scan technology. The main results are as follows:1. AIS nanocrystals were synthesized by one–pot method usingsilver nitrate, indium stearic acid, DT and octadecylene （ODE） asprecursors. Spinel AIS were obtained by hot injection method. The effecton the phase and composition of the samples was investigated. Theresults showed that the pure and good crytallity AIS phase was obtain at250oC for4h in ODE with DT.2. Hexagonal ZIS nanocrystals were synthesized by one–pot methodzinc（II） acetate, indium stearic acid, DT and octadecylene （ODE） asprecursors. The effect on the phase composition and size of the sampleswas investigated. The results indicated that pure and uniform ZISnanocrystals were prepared at280oC for7h. Meanwhile, hexagonal ZISnanocrystals exhibited PL properties.3. Cu2ZnSnS4nanocrystals were synthesized by one–pot methodusing copper（II） acetylacetonate, zinc（II） acetate, tin（II） chloride), Spowder and oleylamine as precursors. The effect on the sizecomposition and morphology of the samples of reactive time,temperature and solvent was investigated. The results shown thatkestrite CZTS with10nm were obtain at250oC for4h. The Nonlinearproperties of the tetragonal CZTS nanocrystals with different size werecharacterized by Z-scan technology. Finally, the growth mechanism of nanocrystals was investigated.Wurtzite CZTS nanocrystals were synthesized by one–pot methodusing copper（II） acetylacetonate, zinc（II） acetate, tin（II） chloride, DDTand ODE as precursors. The effect on the size composition andmorphology of the samples of reactive time, temperature and solventwas investigated. The results displayed that wurtzite CZTSnanocrystals were obtained. The nonlinear properties of the wurtziteCZTS nanocrystals were also characterized by Z-scan technology.Finally, the growth mechanism of nanocrystals was investigated.

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