Formation of CdSe nanocrystals in Cd-doped thin arsenic selenide films under laser irradiation

被引：15

作者：

Azhniuk, Yu. M. ^{[1
,2
]}

Solonenko, D. ^{[3
]}

Sheremet, E. ^{[4
]}

Loya, V. Yu. ^{[1
]}

Grytsyshche, I. V. ^{[1
]}

Schulze, S. ^{[4
]}

Hietschold, M. ^{[4
]}

Gomonnai, A. V. ^{[1
,2
]}

Zahn, D. R. T. ^{[3
]}

机构：

[1] Ukr Nat Acad Sci, Inst Electron Phys, 21 Univ Skaya Str, UA-88017 Uzhgorod, Ukraine

[2] Uzhgorod Natl Univ, UA-88000 Uzhgorod, Ukraine

[3] Tech Univ Chemnitz, Semicond Phys, D-09107 Chemnitz, Germany

[4] Tech Univ Chemnitz, Solid Surface Anal, D-09107 Chemnitz, Germany

来源：

THIN SOLID FILMS | 2018年 / 651卷

关键词：

Amorphous film; Raman scattering; Semiconductor nanocrystals; Tensile strain; Photoplastic effect; RAMAN-SCATTERING; ORIGIN; SE; TRANSFORMATIONS; EMISSION; DYNAMICS; GLASSES; AS2S3;

D O I：

10.1016/j.tsf.2017.06.023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Amorphous Cd-doped As2Se3 films with nominal Cd contents up to 12 at.% were prepared by thermal evaporation. Atomic force microscopy studies confirm the uniform film structure with surface roughnesses below 1 nm, independent of the Cd content. As shown by energy-dispersive X-ray spectroscopy, the Cd content in the film reveals a strong gradient and decreases with the film depth. For heavily Cd-doped (above 7 at.%) As2Se3 films, Raman features attributed to CdSe longitudinal optical (LO) phonon and its overtone (2LO) are revealed in the Raman spectra as an evidence for the formation of CdSe nanocrystallites in the As2Se3:Cd film under above-bandgap or below-bandgap laser illumination. The CdSe nanocrystallites undergo tensile strain due to a photoplastic effect in the As2Se3 film, i.e. partial removal of the material from the laser spot. The tensile strain value, estimated from the LO phonon frequency shift, is shown to reach nearly 2 GPa. (C) 2017 Elsevier B. V. All rights reserved.

引用

页码：163 / 169

页数：7

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