西安交通大学动力工程多相流国家重点实验室,西安,710049
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纸质出版:2008
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李明涛, 苏进展, 周朝晖, 等. ZnIn2S4薄膜喷雾热分解制备及其光电化学性质[J]. 西安交通大学学报, 2008,42(1):106-109.
李明涛, 苏进展, 周朝晖, et al. Preparation of ZnIn2S4 Thin Film by Spray Pyrolysis and Its Photoelectrochemical Characteristic[J]. 2008, 42(1): 106-109.
以ZnCl
2
、InCl
3
·4H
2
O和(NH
2
)
2
CS为原料
采用喷雾热分解方法在ITO玻璃上制备了高质量的ZnIn
2
S
4
薄膜
使用X射线衍射仪、扫描电镜和分光光度计对制备的薄膜进行了结构、形貌和光学性质的表征
利用基于密度泛函理论的平面波赝势方法对制备的立方相ZnIn
2
S
4
进行了能带结构计算
并采用锁相放大技术研究了ZnIn
2
S
4
电极的光电流作用谱图.结果表明:使用喷雾热分解方法能够制备结晶完好、无针孔的ZnIn
2
S
4
薄膜
制得的薄膜呈立方相
在可见光区(λ>420 nm)有很好的光吸收; 薄膜为间接带隙半导体
价带最高轨道由S3p+In5p构成
导带最低轨道由S3p+In5s轨道构成
作为光电极使用可有很好的光电化学响应
在0.1 mol/L Na
2
SO
3
和0.1 mol/L Na
2
S的混合电解质溶液中
0.3 V电极电势下400 nm处的光电转换效率(IPCE)达到了30%以上.
ZnIn
2
S
4
thin films were prepared on ITO conductive glass by spray pyrolysis from a mixed aqueous solution of ZnCl
2
InCl
3
·4H
2
O and(NH
2
)
2
CS. Some properties of the deposited film
such as structure
morphology and optical characteristics
were characterized by XRD
SEM
and UV-vis spectrum. Moreover
the band structure and density of states were evaluated with the plane wave pseudopo
tential method based on density functional theory. The photocurrent action spectrum was investigated via lock-in technique. It is found that high crystallinity and pinhole free cubic ZnIn
2
S
4
film with fine adhesion to ITO substrate can be prepared by spray pyrolysis. The deposited film is endowed with a cubic spinel structure with good absorption in visible light. The cubic ZnIn
2
S
4
is a indirect gap semiconductor
whose valence band maximum(HOMO)mainly consists of S3p+In5p orbitals
and the conduction band minimum(LUMO)consists of S3p+In5s orbitals. As a photoanode
the deposited film exhibits a good photoresponse. In 0.1 mol/L Na
2
SO
3
+0.1 mol/L Na
2
S mixed solution
the IPCE achieves over 30% at a potential of 0.3 V vs. SCE(Saturated Calomel Electrode)at 400 nm irradiation wavelength.
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