| Semiconductor nanocrystals play a major role in the development and improvement of functional nanoscale materials and devices, meanwhile, the synthesis of such nanocrystals is one of the great importance in the field of nanoscale material science. Own to such unique merits as quantum size effect which is different from the one of the corresponding bulk materials has been widely used in solar cells, thin-film transistors, light-emitting diodes (LED), biological labeling and so on. Among these semiconductor materials,Ⅰ-Ⅲ-Ⅵ,Ⅰ-Ⅳ-Ⅵfamily semiconductor nanoparticles such as CuInSe2,Cu2SnSe3, with optimum width of band gap, high theoretical photoelectric efficiency, extraordinarily high absorption coefficient, direct band gap and long-term stability, are considered promising candidates for next generation solar cells. As aⅡ-Ⅵcompound semiconductor materials with direct band gap of 2.7 eV, ZnSe is almost transparent to visible and NIR light, can grow under low temperature. It's a good buffer layer as a substitute of CdS for thin films solar cells.In this dissertation, we focus on synthesis of (CuInSe2)x(ZnSe)1-x, (Cu2SnSe3)x(ZnSe)1-x semiconductor nanocrystals by hot-injection method. And characterizations the crystal structure, elementary composition, microscopic structure and optical performance of alloyed nanocrystals by XRD, EDS, UV-via, XPS, TEM, etc. We investigated the influence for properties of nanocrystals with different experimental condition. The result confirms that the size, band gap and elementary composition of alloyed nanocrystals can be controllable and absorption edge of the alloyed nanocrystals can cover the rang of UV-vis-NIR, this make the nanocrystals have prospects for wider application on solar cells, photocatalysis, biological fluorescent probe and so on. It can be utilized more reasonable and efficient for solar cells due to different purpose. |
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