Ternary CdS1–xSex nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement,Journal of Raman Spectroscopy

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Ternary CdS1–xSex nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-01-07 , DOI: 10.1002/jrs.6063
Yuriy M. Azhniuk _{1,

2} , Volodymyr M. Dzhagan _{3,

4} , Dmytro Solonenko ₅ , Vasyl V. Lopushansky ₁ , Vasyl Y. Loya ₁ , Volodymyr M. Kryshenik ₂ , Ivan M. Voynarovych ₁ , Alexander V. Gomonnai _{1,

2} , Dietrich R.T. Zahn ₅

Affiliation

Micro‐Raman spectra of amorphous As–Se–S:Cd films prepared by thermal evaporation on silicon and silicate glass substrates measured at different laser power densities show the formation of CdS_1–xSe_x nanocrystals in the As–Se–S:Cd film under laser beam illumination due to a photoinduced material transfer and photoenhanced diffusion in the laser spot area. The material transfer and the photoenhanced diffusion are caused by a non‐thermal interaction of light with the amorphous As–Se–S:Cd films. The chemical composition of the CdS_1–xSe_x nanocrystals can be determined from the difference of the CdSe‐like and CdS‐like LO phonon wavenumbers in the Raman spectra. The photoluminescence peak energies are in agreement with the CdS_1–xSe_x composition, with the average nanocrystal size being somewhat above the exciton Bohr radius.

中文翻译：

由于微拉曼测量过程中的光增强扩散，在掺Cd的As-Se-S薄膜中形成了三元CdS1-xSex纳米晶体

通过在不同激光功率密度下在硅和硅酸盐玻璃衬底上热蒸发制备的非晶态As-Se-S：Cd薄膜的微拉曼光谱，表明在As-Se-S：Cd中形成了CdS _{1– x} Se _x纳米晶体。由于在激光光斑区域中发生了光诱导的材料转移和光增强的扩散，因此在激光束照射下形成薄膜。物质的转移和光增强的扩散是由光与非晶态As-Se-S：Cd薄膜的非热相互作用引起的。CdS _{1– x} Se _x的化学成分可以通过拉曼光谱中CdSe类和CdS类LO声子波数的差确定纳米晶体。光致发光峰值能量与CdS _{1- x} Se _x组成一致，平均纳米晶体尺寸略高于激子玻尔半径。

更新日期：2021-01-07

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