一种纤维锌矿结构CuInS_2纳米化合物的合成方法

A method for synthesizing wurtzite CuInS_2

CuInS2(CIS)是重要的三元Ⅰ-Ⅲ-Ⅵ族直接带隙半导体化合物光伏材料。纤维锌矿CIS的铜和铟原子共享一个晶格,因此其在化学计量比调控方面更加灵活,对高效太阳能电池具有重要意义。在低温条件下,通过简单高效的热注入法合成了在常温下能稳定存在的纤维锌矿CIS纳米化合物,并通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光谱仪(EDX)和紫外可见分光光度计(UV)分别对其晶相、形貌、化学计量比和能带值进行了分析。结果表明:合成的CIS纳米化合物呈纤维锌矿结构;能带值为1.47eV,非常接近最佳能带值;呈六边形纳米盘状,纳米盘厚度约为10nm,直径约为100nm;Cu∶In∶S的化学计量比为1.70∶1∶2.94。

CulnSL （CIS） is an important I-Ⅲ-Ⅵ direct band gap semiconductor compound photovoltaic material. The CIS with wurtzite structure shows flexibility in stoichiometry, because the copper and indium atoms share the same lattice site. This characteristic makes it suitable for high efficient solar cells. In this paper, the synthesis of wurtzite CIS nano compounds at low temperature by the simple hovinjection method is studied. The synthesized CIS can exist stably at a room temperature. The microstructure crystalline phase, morphology, chemical composition and band gap energy of the synthesized CIS nano compounds are studied by Xray diffraction （XRD）, field emission scanning electron microscope （FE SEM）, energy dispersive Xray spectroscopy （EDX） and UV spectrophotometer, respectively. The experiment results demonstrate that the synthesized CIS is with wurtizite, and the energy gap is 1. 47 eV, which is very close the optimized energy gap of the solar cells. The synthesized CIS has the shape of hexagonal plate with the thickness and diameter of 10 nm land 100nm The stoichiometric ratio of the synthesized CIS is 1.70： 1：2. 94.