Preparation and Characterization of Cu2ZnSnS4 Nanocrystals and Thin Films

doi:10.11901/1005.3093.2013.335

Chinese Journal of Materials Research

2014, Vol. 28

Issue (2): 153-160 DOI: 10.11901/1005.3093.2013.335

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Preparation and Characterization of Cu₂ZnSnS₄Nanocrystals and Thin Films

Donglin XIA(

),Yuchen ZHENG,Bo HUANG,Xiujian ZHAO

State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070

Cite this article:

Donglin XIA,Yuchen ZHENG,Bo HUANG,Xiujian ZHAO. Preparation and Characterization of Cu₂ZnSnS₄Nanocrystals and Thin Films. Chinese Journal of Materials Research, 2014, 28(2): 153-160.

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Abstract

The Cu₂ZnSnS₄ (CZTS) nanocrystallites were synthesized by hot injection method with starting materials of copper (II) acetylacetonate [Cu (AcAc)₂], zinc acetate [Zn(CH₃COO)₂2H₂O], tin(II) chloride dehydrate [SnCl₂2H₂O], elemental sulfur (S) and dodecanethiol. Then CZTS thin films were prepared by spin coating method. The crystallographic structure, morphology, chemical composition and optical properties of CZTS nanocrystallites and their thin films were characterized by X-ray diffraction (XRD), Raman spectrum (RS), transmission electron microscopy (TEM), scanning electron microscope (SEM) with energy dispersive X-Ray spectroscopy (EDS) and UV-Vis transmittance spectroscopy. The influence of injection temperature on the crystallographic structure, morphology, grain size and chemical composition of CZTS nanocrystallites, and the influence of annealing time on the crystallographic, morphology, chemical composition and optical properties of CZTS thin films were investigated respectively. The results show that the CZTS nanocrystallites synthesized at 180 ℃ were consisted of single phase kesterite with an average grain size 18 nm, while the CZTS thin film after annealing at 500℃ for 2h exhibits an absorption coefficient of 10⁴ cm^-1 for the visible light and an optical band gap of 1.45 eV.

Key words: inorganic non-metallic materials Cu₂ZnSnS₄ hot injection method nanocrystallite spin coating method

Received: 20 May 2013

Fund: *Supported by the Key Project of Natural Science Foundation of China No. 20101j0121.

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	Donglin XIA
	Yuchen ZHENG
	Bo HUANG
	Xiujian ZHAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.335 OR https://www.cjmr.org/EN/Y2014/V28/I2/153

Fig.1 XRD patterns of CZTS nanocrystals prepared at different injection temperature (A₁) 150℃; (A₂) 180℃; (A₃) 200℃; (A₄) 250℃

Fig.2 Raman spectra of CZTS nanocrystals prepared at different injection temperature (A₁) 150℃; (A₂) 180℃; (A₃) 200℃; (A₄) 250℃

Fig.3 TEM and HRTEM micrographs of sample A₁

Fig.4 TEM and HRTEM micrographs of sample A₂

Fig.5 TEM and HRTEM micrographs of sample A₃

Fig.6 TEM and HRTEM micrographs of sample A₄

Table 1 EDS date of CZTS nanocrystals prepared at different injection temperature (atomic fraction, %)

Fig.7 XRD patterns of CZTS thin films prepared at different annealing time (B₀) As-deposited; (B₁) 1 h; (B₂) 1.5 h; (B₃) 2 h

Fig.8 SEM microgarphs of CZTS thin films prepared at different annealing time (a) As-deposited; (b) 1 h; (c) 1.5 h; (d) 2 h

Table 2 EDS date of CZTS thin films prepared at different annealing time (atomic fraction, %)

Fig.9 UV-Vis absorption spectroscopy of CZTS thin films prepared at different annealing time (B₁) 1 h; (B₂) 1.5 h; (B₃) 2 h

Fig.10 (ahn)²~(hn) curves of CZTS thin films prepared at different annealing time (B₁) 1 h; (B₂) 1.5 h; (B₃) 2 h

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