Browsing by Author "LHR TP 9428"

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    Systematic Interfacial Strain Induced Tuning of Structural and Optical Properties of Ecofriendly ZnSe/Bi2X 3 (X=S, Se, Te) Core/Shell Quantum Dots
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2024) Saleha Amjad; CIIT/FA22-RPH-034/LHR; Dr. Faiza Mustafa; LHR TP 9428
    Zinc selenide-based Core-Shell QDs are generating many recognitions because of its ability in many applications such as optoelectronic and display devices. Similarly, Bismuth chalcogenides Bi2X3(X= S, Se, Te) are a class of unique material that are widely used for optoelectronic applications due to optical, electrical properties and eco-friendly composition. In this work Novel ZnSe/ Bi2X3(X= S, Se, Te) based quantum dots of core and shell were manufactured via facile two step method of hot injection. The structural, optical and electronic properties are analyzed by UV-Visible, XRD, Raman and Photoluminescence spectroscopy. The core (ZnSe) and shell modes Bi2X3 (X= S, Se, Te) vibrational modes properties are displayed in the Raman spectroscopy data. data. ZnSe/Bi2Se3 has 1.7% lattice mismatch, ZnSe/Bi2Se3 has 31.9%, and ZnSe/Bi2Te3 has 15%, according to X-ray diffraction data.The ZnSe/Bi2S3, ZnSe/Bi2Se3, and ZnSe/Bi2Te3 thicknesses as seen by XRD are 10.8, 1.54, and 3.49nm, respectively. The average size of a ZnSe particle is 41.37 nm, while the core-shell particles of ZnSe/Bi2S3, ZnSe/Bi2Se3, and ZnSe/Bi2Te3 are 9.8, 4.7, and 8.4 nm, in that order. XRD is used to measure these computations theoretically. Due to its greatest thickness and minimal lattice misfit, ZnSe/Bi2S3 is discovered to have a wide photoluminescence spectrum, which indicates that its photoluminescence intensity has grown and covered all structural faults. Thus, I found that ZnSe/Bi2S3 is the most appropriate material for Core-Shell QDs out of the three bismuth chalcogenides ZnSe/Bi2X3 (X= S, Se, Te).