Structural and Optical Properties of CdSe/CdTe Core-Shell Quantum Dots

Structural and Optical Properties of CdSe/CdTe Core-Shell Quantum Dots
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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:
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通讯作者:
R. M. Gengan
R. M. Gengan
中科院分区:
--
文献类型:
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作者:
G. Ramalingam;C. Ragupathi;Baskaran Rangasamy;I. Colak;V. Vetrivelan;Neda Poudineh;Balaraman Ravindran;S. Chang;R. M. Gengan

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开发了一种简单的水热方法来合成高质量的 II 型核壳 CdSe/CdTe 量子点 (QD)。 XRD结果表明形成了CdSe和CdTe混合相,晶粒尺寸为12.6nm。 SEM 形貌证实纳米级 CdSe/CdTe 分布均匀,没有团聚。 EDX 证实了化合物中存在 Cd、Se 和 Te 元素。 TEM结果表明球形CdSe/CdTe核壳量子点的尺寸在8~10 nm范围内。 SAED 模式的显着结果证实核和壳成分分别为 CdSe 和 CdTe。讨论了核壳 CdSe/CdTe 量子点的合成过程和相应结构之间的相关性。所证明的核壳 CdSe/CdTe 量子点的单分散晶格结构在 λ emi ~ 585 nm 处具有优异的 PL 发射性能,适用于光伏应用。 455 nm 和 560 nm 处的紫外-可见吸收带证实了由于 CdSe/CdTe QD 的 II 型基质而产生的激子发射。
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.