Structures and optical properties of CdSe nano flakes synthesized by an elemental direct reaction method

• Published in: Journal of crystal growth 2022-11, Vol.597, p.126847, Article 126847
• Main Authors: Ji, Peng Fei, Li, Peng Fei, Li, Yong, Du, Hao Jie, Hao, Ya Juan, Song, Yue Li, Zhou, Feng Qun
• Format: Article
• Language: English
• Subjects: A1. Crystal structure; B1. Nanomaterials; B2. Semiconducting II-VI materials
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2022.126847

•CdSe nanoflakes have been synthesized by an elemental direct reaction method.•CdSe nano flakes are approximately perpendicular to Cd foil substrate.•According to Kubelka-Munk method, band gap can be estimated to be ∼2.44 eV.•Multi-peak emissions can be observed and origin has been discussed in detail. CdSe nano flakes have been synthesized through using the selenium powder and cadmium foil in the ethylenediamine by an elemental direct reaction method. These high-quality CdSe nano flakes, being approximately perpendicular to the cadmium foil substrate, show the hexagonal structure and are characterized with the networking structures. According to Kubelka-Munk method, band gap of CdSe nano flakes can be estimated to be ∼2.44 eV. Multi-peak emissions under the excitation of 325 nm can be observed at room temperature. From green to red, four emissions can be fitted and attributed to the transition of band gap, selenium vacancies, interstitial cadmium, and the surface defects associated with oxygen, respectively. Investigation of multi-peak emission origins as well as understanding and regulating of defect states are helpful for CdSe nano flakes to apply in the field of the optoelectronic devices.