Research Article Structural and Optical Properties of CdSe/CdTe Core-Shell Quantum Dots G. Ramalingam , 1 C. Ragupathi, 2 Baskaran Rangasamy , 3 I. Colak , 4 V. Vetrivelan , 5 Neda Poudineh , 6 Balasubramani Ravindran , 7 Soon Woong Chang, 7 and Robert M. Gengan 8 1 Department of Nanoscience and Technology, Science Campus, Alagappa University, Karaikudi, 630003 Tamil Nadu, India 2 Department of Chemistry, Sriram College of Arts and Science, Perumalpattu, Tiruvallur, 602024, Tamilnadu, India 3 Energy Storage Materials and Devices Lab, Department of Physics, School of Mathematics and Natural Sciences, The Copperbelt University, PO Box 21692, Riverside, Kitwe, Zambia 4 Department of Electrical and Electronics Engineering, Nisantasi University, Istanbul, Turkey 5 Department of Physics, Thanthai Periyar Government Institute of Technology, Vellore, 632002, Tamilnadu, India 6 Department of Energy Systems Research, Ajou University, Suwon 16499, Republic of Korea 7 Department of Environmental Energy and Engineering, Kyonggi University, Yeongtong-Gu, Suwon, Gyeonggi-Do 16227, Republic of Korea 8 Department of Chemistry, Faculty of Applied Sciences, Durban University of Technology, Durban 4001, South Africa Correspondence should be addressed to G. Ramalingam; ramanloyola@gmail.com and Baskaran Rangasamy; baskaran.rangasamy@cbu.ac.zm Received 7 November 2021; Revised 25 December 2021; Accepted 30 December 2021; Published 22 January 2022 Academic Editor: Karthikeyan Sathasivam Copyright © 2022 G. Ramalingam et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. A simple hydrothermal method is developed for the synthesis of high-quality type II core-shell CdSe/CdTe quantum dots (QDs). The XRD results reveal the formation of mixed phases of CdSe and CdTe with a grain size of 12.6 nm. SEM morphology confirms the uniformly distributed nanoscale CdSe/CdTe with no agglomeration. EDX confirms the elemental presence of Cd, Se, and Te in the compound. TEM results suggest that the size of spherical CdSe/CdTe core-shell QDs is in the range of 8~10 nm. Significant results of the SAED pattern confirm the core and shell components as CdSe and CdTe, respectively. The correlation between the synthesis procedures and the corresponding structures of the core-shell CdSe/CdTe QDs is discussed. The demonstrated monodispersed lattice structure of core-shell CdSe/CdTe QDs has excellent PL emission properties at λ emi ~ 585 nm which is suitable for photovoltaic applications. The UV-Vis absorption bands at 455 nm and 560 nm confirm exciton emission due to the type II matrix of CdSe/CdTe QDs. 1. Introduction Nanoscience and nanotechnology breakthroughs have unlocked several possibilities in various fields, including solar cell systems, photodetectors, electrical injection lasers, and optical waveguides [1]. With the rapid advancement of synthesis, characterization, and methods, scientists have dis- covered that combining multicomponent nanomaterials and tuning their composition profile can result in more desirable properties such as textural morphology and electrical and optical behaviour which leads to enhancement of their appli- cations in a wide variety of fields [2, 3]. Due to the tunable architecture, nanomaterials especially the core-shell nano- structures have an impact in most of the thrust research areas in recent years. Following solar energy conversion and in conjunction with the use of heterostructures, nanostructures Hindawi Journal of Nanomaterials Volume 2022, Article ID 6316716, 7 pages https://doi.org/10.1155/2022/6316716