Study on the fabrication of CdZnSe/ZnSeS ternary alloy quantum dots. (9th March 2015)

• Record Type: Journal Article
• Authors: Nga, Pham Thu; Yen, Nguyen Hai; Cuong, Dinh Hung; Hai, Nguyen Ngoc; Nghia, Nguyen Xuan; Hanh, Vu Thi Hong; Vu, Le Van; Coolen, Laurent
• Is Part Of: International journal of nanotechnology. Volume 12:Number 5/6/7(2015)
• Page Start: 525
• Page End: 537
• Publication Date: 2015-03-09
• Subjects: ternary quantum dots -- structural properties -- CdZnSe/ -- ZnSeS -- cadmium zinc selenide -- zinc selenium sulfide -- crystalline phase -- alloy composition -- size -- nanotechnology -- shell thickness -- shell composition -- growth temperature; 620.505
• Languages: English
• ISSNs: 1475-7435

Abstract

In an effort to search for new compositions and structures of quantum dots with suppressed blinking photoluminescence (random switching between states of high (on) and low (off) emissivity under continuous photo–excitation) and to serve application purposes in biosensors and in optoelectronic devices, we have studied the fabrication of new CdZnSe/ZnSeS ternary alloy quantum dots (QD). In this work, we present new results on the fabrication of the alloy core/shell quantum dots having a shell thickness of about 1.52 nm and a varied shell composition in Se#47;S ratio. The influence of the growth temperature on the structural properties (crystalline phase and cell), size and elemental compositions of the core and core/shell QDs is presented. Analysis and in–depth comparison of the calculated ternary QDs' composition are performed based on the energy dispersive X–ray spectroscopy (EDS) data and the first exciton absorption peak position and size. Interpretation of the experimental results is also provided.