Preparation of a nanostructured CdTe@CdS core-shell/Si photodetector by two-step laser ablation in liquid

被引：8

作者：

Abdalaah, Yamamah K. ^{[1
]}

Mahmood, Olfat Ahmed ^{[1
]}

Shaker, Suaad S. ^{[2
]}

Ismail, Raid A. ^{[2
]}

机构：

[1] Univ Diyala, Coll Sci, Dept Phys, Diyala, Iraq

[2] Univ Technol Baghdad, Dept Appl Sci, Baghdad, Iraq

来源：

JOURNAL OF OPTICS-INDIA | 2025年 / 54卷 / 03期

关键词：

Core-shell; CdTe@CdS; Laser ablation; Liquid; Photodetector; OPTOELECTRONIC PROPERTIES; OXIDE NANOPARTICLES; OPTICAL-PROPERTIES; EFFICIENCY; FABRICATION;

D O I：

10.1007/s12596-024-01720-5

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this study, CdTe@CdS core-shell nanoparticles (NPs) were synthesized by pulsed laser ablation in distilled water. X-ray diffraction results showed a crystalline core/shell type. UV-Vis measurements revealed that the optical band gap of CdTe@CdS NPs was 2.25 eV. Energy-dispersive X-ray mapping confirmed the formation of the CdTe@CdS core/shell. Transmission electron microscope studies revealed that the core size (CdTe) is 16 nm, and the shell thickness (CdS) is around 3 nm. The photoluminescence (PL) spectrum confirms the emission of a strong and broad peak at 506 nm. The current characteristics of the n-CdTe@CdS/p-Si heterojunction exhibited rectifying behavior with an ideality factor of 4.3. The spectral operating region of the fabricated photodetector ranged from visible to near-infrared, with a maximum responsivity of 0.901 A/W at 810 nm. The specific detectivity and external quantum efficiency of CdTe@CdS/Si were 4.5 x 1011 Jones and 1.1 x 102%, respectively, at a bias voltage of - 7.5 V.

引用

页码：700 / 711

页数：12

共 49 条

[1] Antibacterial and cytotoxic activities of cerium oxide nanoparticles prepared by laser ablation in liquid [J].