Synthesis and Optical Characterization of CuInxGa1-xS2 Nanocrystals

• Main Authors: Yu-Jui Shih, 施佑叡
• Other Authors: Yu-Tai Shih
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/13701867451115038824

碩士 === 國立彰化師範大學 === 光電科技研究所 === 103 === CuInxGa1-xS2 nanocrystals (NCs) were synthesized by non-injection method. The structure and optical properties of the CuInxGa1-xS2 NCs were investigated by the measurements of X-ray diffraction (XRD), spectrophotometer, transmission electron microscopy, and Raman spectroscopy. XRD results shown that the CuInxGa1-xS2 NSc were wurtzite structure. The spacing between (002) planes decreased as the mole fraction of Ga increased. The size of the CuInxGa1-xS2 NCs were about 15 nm. The band gap of the CuInxGa1-xS2 NCs were determined by absorption measurements and ranged between 1.59 ~ 2.7 eV. This band gap increased linearly as the mole fraction of Ga increased. Raman signal intensity of the CuInxGa1-xS2 NCs was increased around 2105 times with the application of surface-enhanced-Raman-scattering technique. The signal of A1 mode shifted from 279 to 294 cm-1 as the mole fraction of Ga increased. This result agreed with the estimate of theoretical calculation. The variation of lattice vibration frequency was due to the variations of vibrating atoms, spacing of (002) planes, and strength of bonding between atoms.