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首页> 外文期刊>Applied Surface Science >Combinatorial study of the structural, optical, and electrical properties of low temperature deposited Cd_(1-x)Zn_xTe (0≤x≤1) thin films by MOCVD
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Combinatorial study of the structural, optical, and electrical properties of low temperature deposited Cd_(1-x)Zn_xTe (0≤x≤1) thin films by MOCVD

机译：低温沉积CD_（1-X）Zn_XTE（0≤x≤1）薄膜的结构，光学和电性能的组合研究通过MOCVD

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摘要

Polycrystalline Cd1-xZnxTe thin films prepared by a combinatorial MOCVD process were characterised for their structural, optical, and electrical properties. Films became smoother with smaller grains displaying higher sub bandgap transmittance with increasing x. The X-ray diffraction pattern indicated (111) texture for all films, with increasing compositional inhomogeneity for ternary compositions. Room-temperature optical transmittance and micro-photoluminescence (PL) spectra were analysed to determine the dependence of composition with the bandgap. The non-linear variation of the bandgap with composition was fitted, giving around 0.7 and 0.3 band bowing parameters from optical and PL spectra, respectively. Raman scattering experiments showed that ZnTe-like LO mode varies linearly for x 0.2. However, Te-related modes (due to surface migration of tellurium) emerge along with the smearing out of parent Raman modes with increasing excitation power. Temporal behaviour of Te modes with excitation power indicated formation of tensile stress due to laser heating. The film resistance increased up to 4 orders of magnitude, corroborating with the semiconductor grain size trend, with increasing Zn concentration. Post-growth annealing of the films in a hydrogen environment above 430 degrees C decreased the inhomogeneity in ternary alloys, making these films more appealing, for example, for photovoltaic applications.
机译：通过组合MOCVD工艺制备的多晶CD1-XZNXTE薄膜的特征在于它们的结构，光学和电性能。薄膜变得更加光滑，较小的晶粒，随着x的增加，显示更高的子带隙透射率。对于所有薄膜的X射线衍射图案表示（111）纹理，随着三元组合物的成分不均匀性。分析室温光学透射率和微光致发光（PL）光谱以确定组合物与带隙的依赖性。将带隙与组合物的非线性变化配合，分别从光学和PL光谱的约0.7和0.3带弯曲参数。拉曼散射实验表明，ZnTe样Lo模式为X> 0.2线性变化。然而，Te相关模式（由于碲的表面迁移）随着较大的激励力而出现母拉曼模式的涂抹方式。具有激励功率的TE模式的时间特性表示由于激光加热引起的拉伸应力的形成。膜阻力增加至多4个级，用半导体晶粒尺寸的趋势呈证实，随着Zn浓度的增加。在430摄氏度高于430℃的氢气环境中膜的后生长退火减少了三元合金中的不均匀性，使得这些薄膜更具吸引力，例如，用于光伏应用。

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  • 来源
    《Applied Surface Science》 |2021年第2期|148452.1-148452.10|共10页
  • 作者

    Kartopu G.; Fan Q.; Oklobia O.; Irvine S. J. C.;

  • 作者单位

    OpTIC Ctr Solar Energy Res St Asaph Business Pk St Asaph LL17 0JD Wales;

    OpTIC Ctr Solar Energy Res St Asaph Business Pk St Asaph LL17 0JD Wales;

    OpTIC Ctr Solar Energy Res St Asaph Business Pk St Asaph LL17 0JD Wales;

    OpTIC Ctr Solar Energy Res St Asaph Business Pk St Asaph LL17 0JD Wales;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    CdTe; ZnTe; CdZnTe; Thin film; MOCVD; Combinatorial;

    机译：Cdte;Znte;Cdznte;薄膜;MOCVD;组合;

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