Shih Yu-Tai, Tsai Yu-Ching, Lin Der-Yu
Department of Physics, National Changhua University of Education, Changhua 50007, Taiwan.
Department of Electronic Engineering, National Changhua University of Education, Changhua 50074, Taiwan.
Nanomaterials (Basel). 2020 Oct 19;10(10):2066. doi: 10.3390/nano10102066.
In this paper, the synthesis and characterization of CuInGaSe (0 £ £ 1) nanocrystals are reported with the influences of value on the structural, morphological, and optical properties of the nanocrystals. The X-ray diffraction (XRD) results showed that the nanocrystals were of chalcopyrite structure with particle size in the range of 11.5-17.4 nm. Their lattice constants decreased with increasing Ga content. Thus, the value of the CuInGaSe nanocrystals was estimated by Vegard's law. Transmission electron microscopy (TEM) analysis revealed that the average particle size of the nanocrystals agreed with the results of XRD. Well-defined lattice fringes were shown in the TEM images. An analysis of the absorption spectra indicated that the band gap energy of these CuInGaSe nanocrystals was tuned from 1.11 to 1.72 eV by varying the value from 0 to 1. The Raman spectra indicated that the A optical vibrational mode of the nanocrystals gradually shifted to higher wavenumber with increasing value. A simple theoretical equation for the A mode frequency was proposed. The plot of this equation showed the same trend as the experimental data.
本文报道了CuInGaSe（0≤≤1）纳米晶体的合成与表征，以及值对纳米晶体结构、形态和光学性质的影响。X射线衍射（XRD）结果表明，纳米晶体为黄铜矿结构，粒径在11.5 - 17.4nm范围内。其晶格常数随Ga含量的增加而减小。因此，通过维加德定律估算了CuInGaSe纳米晶体的值。透射电子显微镜（TEM）分析表明，纳米晶体的平均粒径与XRD结果一致。TEM图像中显示出清晰的晶格条纹。吸收光谱分析表明，通过将值从0变化到1，这些CuInGaSe纳米晶体的带隙能量从1.11 eV调谐到1.72 eV。拉曼光谱表明，纳米晶体的A光学振动模式随着值的增加逐渐向更高波数移动。提出了A模式频率的一个简单理论方程。该方程的曲线与实验数据显示出相同的趋势。
