基于水热合成 Cd-Se-Te 纳米结构的可见光光电探测器

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Subhashree Das, Ayushmaan Tripathi, Abinash Parida, Devarajan Alagarasan, Ramakanta Naik
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引用次数: 0

摘要

金属卤化物目前在各种光电领域备受瞩目。在保持镉含量不变的情况下,通过改变硒和碲的含量,通过水热法合成了 Cd-Se-Te 纳米材料。结构研究提供了有关形成六方碲化镉和立方碲化镉相的信息。材料的结晶度随着 Te 含量的增加而增加。拉曼光谱显示材料中存在各种 Cd-Te 和 Cd-Se 模式。材料的形态从圆柱形变为球形。光学研究表明,带隙减小,吸收边红移。材料的折射率与光带隙的表现完全相反。X 射线光电子能谱显示了镉的 +2 氧化态以及硒和碲的 -2 氧化态。光致发光(PL)研究提供了材料中存在的缺陷态,并显示 PL 峰发生了红移,与吸收边缘相同。材料的电流-电压研究表明,随着 Te 浓度的增加,光电流也会增加。光响应研究是通过白光照明完成的,因此具有良好的响应性和检测性。所有这些结果表明,该材料适合应用于可见光光电探测器。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Visible Light Photodetectors Based on Hydrothermally Synthesized Cd-Se-Te Nanostructures

Visible Light Photodetectors Based on Hydrothermally Synthesized Cd-Se-Te Nanostructures
Metal chalcogenides are currently in the limelight for various optoelectronic sectors. Cd-Se-Te nanomaterials are hydrothermally synthesized by varying Se and Te while keeping the Cd content constant. A structural study provides information on the formation of hexagonal CdSe and cubic CdTe phases. The material crystallinity increased with an increase in the Te content. Raman spectroscopy showed the presence of various Cd-Te and Cd-Se modes present in the material. The morphology of the material changes from a cylindrical to a spherical shape. The optical study illustrates the reduction in the bandgap and red shift in the absorption edge. The refractive index of the material behaves exactly opposite of the optical bandgap. The X-ray photoelectron spectra provided the +2-oxidation state of Cd and the −2 oxidation state of both Se and Te. A photoluminescence (PL) study provides the defect states present in the material and shows a red shift in the PL peak, which is the same as the absorption edge. A current–voltage study of the material shows the increased pattern in the photocurrent with an increment in the Te concentration. The photoresponse study was done by the illumination of white light, which results in good responsivity and detectivity. All of these results show the material is suitable for visible light photodetector applications.
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来源期刊
CiteScore
7.20
自引率
4.30%
发文量
567
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