Graded composition CdxZn1-xTe films grown by Isothermal Close Space Sublimation technique

被引：16

作者：

de Melo, O. ^{[1
]}

Dominguez, A. ^{[1
]}

Gutierrez Z-B, K. ^{[1
]}

Contreras-Puente, G. ^{[2
]}

Gallardo-Hernandez, S. ^{[3
]}

Escobosa, A. ^{[3
]}

Gonzalez, J. C. ^{[4
]}

Paniago, R. ^{[4
]}

Ferraz Dias, J. ^{[5
]}

Behar, M. ^{[5
]}

机构：

[1] Univ Havana, Havana 10400, Cuba

[2] UP ALM, IPN, Escuela Super Fis & Matemat, Mexico City 07738, DF, Mexico

[3] CINVESTAV, IPN, Dept Ingn Elect, Secc Elect Estado Solid, Ciudad Mexico, DF, Mexico

[4] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil

[5] Univ Fed Rio Grande do Sul, Inst Phys, Ion Implantat Lab, BR-91501970 Porto Alegre, RS, Brazil

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2015年 / 138卷

关键词：

Inter-diffusion; II-VI Semiconductors preparation; Physical vapor deposition; Graded composition thin films; CdZnTe solar cells; ZNTE BUFFER LAYER; REFRACTIVE-INDEX; INTERDIFFUSION; EPITAXY; CDTE;

D O I：

10.1016/j.solmat.2015.02.025

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Graded composition CdxZn1-xTe films were prepared by growing several alternate layers of CdTe and ZnTe by the Isothermal Close Space Sublimation technique. The thickness of both kinds of layers was modified along the structure to produce an increase of the average concentration of CdTe towards the surface of the films. Due to Zn/Cd inter-diffusion during the growth process the sequence of layers was converted into a relatively smooth graded composition film. According to X-ray diffraction characterization the layers grew coherently with the (100) oriented GaAs substrates although they showed a relatively high mosaicity. theta-2 theta plots show very wide diffraction peaks as expected from variable composition samples. The band gap grading effect in light absorption was also verified through transmission measurements, using transparent substrates. Graded composition profiles of the thin films were confirmed by x-ray photoelectron and secondary ion mass spectroscopies. Moreover, quantitative Cd, Zn and Te profiles were obtained by the analysis of Rutherford backscattering spectra of the samples. This analysis showed a CdTe molar fraction profile ranging from approximately x=0.8 at the surface of the sample and x=0.35 at the interface with the substrate. The possibility of growing graded composition layers using a simple and cost-effective procedure was demonstrated. This could be interesting in technological applications like CdxZn1-xTe layers of variable composition in CdS/CdTe solar cells. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：17 / 21

页数：5

共 20 条

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