Title: Study on the fabrication of CdZnSe/ZnSeS ternary alloy quantum dots

Authors: Pham Thu Nga; Nguyen Hai Yen; Dinh Hung Cuong; Nguyen Ngoc Hai; Nguyen Xuan Nghia; Vu Thi Hong Hanh; Le Van Vu; Laurent Coolen

Addresses: Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam ' Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam ' Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam ' Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam ' Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam ' Faculty of Physics, Thai nguyen University of Education, Luong Ngoc Quyen Street, Thai Nguyen City, Vietnam ' Center for Materials Science, University of Natural Science, VNU, Hanoi, 334 Nguyen Trai St, Thanh Xuan Dist. Hanoi, Vienam ' Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7588, Institut de NanoSciences de Paris (INSP), F-75005, Paris, France

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.

Keywords: 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.

DOI: 10.1504/IJNT.2015.067910

International Journal of Nanotechnology, 2015 Vol.12 No.5/6/7, pp.525 - 537

Available online: 08 Mar 2015

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