Structural and Optical Properties of CdSe/CdTe Core-Shell Quantum Dots
Structural and Optical Properties of CdSe/CdTe Core-Shell Quantum Dots
复制标题
CdSe/CdTe核壳量子点的结构和光学性质
DOI:
10.1155/2022/6316716
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
R. M. Gengan
中科院分区:
文献类型:
--
作者:
G. Ramalingam;C. Ragupathi;Baskaran Rangasamy;I. Colak;V. Vetrivelan;Neda Poudineh;Balaraman Ravindran;S. Chang;R. M. Gengan
A simple hydrothermal method is developed for the synthesis of high-quality type II core-shell CdSe/CdTe quantum dots (QDs). The XRD results reveal the formation of mixed phases of CdSe and CdTe with a grain size of 12.6nm. SEM morphology con fi rms the uniformly distributed nanoscale CdSe/CdTe with no agglomeration. EDX con fi rms the elemental presence of Cd, Se, and Te in the compound. TEM results suggest that the size of spherical CdSe/CdTe core-shell QDs is in the range of 8 ~ 10 nm. Signi fi cant results of the SAED pattern con fi rm the core and shell components as CdSe and CdTe, respectively. The correlation between the synthesis procedures and the corresponding structures of the core-shell CdSe/CdTe QDs is discussed. The demonstrated monodispersed lattice structure of core-shell CdSe/CdTe QDs has excellent PL emission properties at λ emi ~ 585nm which is suitable for photovoltaic applications. The UV-Vis absorption bands at 455nm and 560 nm con fi rm exciton emission due to the type II matrix of CdSe/CdTe QDs.