Indentation Behavior And Plastic Deformation Mechanism Of CdTe Nano-film

Cadmium telluride(CdTe)nanofilm,as a soft and brittle semiconductor material,has been widely used in optoelectronic devices,such as X-ray detectors,solar cells,and optical waveguides.In addition,CdTe can also form composite nanostructures with other semiconductor materials,such as Hg Te-CdTe superlattices,which are used as novel infrared detectors.By changing the crystal orientation and layer thickness of the composite structure,the bandgap and optical properties can be tuned,making it suitable for long-wavelength infrared detection with optical and electrical characteristics.The movement of dislocation nuclei implies irreversible deformation,which may strongly affect the material’s mechanical behavior and service life.In this work,molecular dynamics methods were employed to investigate the influence of crystal orientation on the mechanical properties and elastic-plastic deformation mechanisms of CdTe nanofilms.The indentation behavior of CdTe nanofilms was evaluated and the plastic deformation mechanism of the material was revealed.The present study investigates the micro-mechanisms of the influence of temperature on the mechanical properties and elastic-plastic deformation of the material.Molecular dynamics methods were also used to investigate the mechanical properties of CdTe-Hg Te-CdTe quantum well structures,reveal the micro-mechanisms of the mechanical properties and elastic-plastic deformation of the structure under indentation loading,and comprehensively analyze the mechanical properties and elastic-plastic deformation mechanisms of the CdTe-Hg Te-CdTe quantum well.The main work of this work is as follows:1.The hardness and plastic deformation mechanism of CdTe nanofilm materials under spherical rigid indentation were studied on different crystal planes((001),(110),and(111)planes).The orientation-dependent mechanical behavior of CdTe nanofilms was systematically compared,and the mechanical properties and microscale mechanisms of elastic-plastic deformation of CdTe nanofilms were obtained at different temperatures(1 K,300 K,and 500 K).2.The mechanical properties of CdTe-Hg Te-CdTe quantum well structures containing Hg Te layers of different widths(1 nm,4 nm,7 nm,10 nm,and 13 nm)were investigated under spherical rigid indentation.The P-h curves and elastic recovery rates of the indentation simulations were obtained.The microstructural evolution process was systematically studied,revealing the microscopic mechanisms of elastic-plastic deformation of different CdTe-Hg Te-CdTe structures.The research in this paper will provide important reference data for the mechanical properties and plastic deformation mechanism of CdTe nano-film materials and composite nanostructures like CdTe-Hg Te-CdTe quantum well structures,and has important value for guiding the practical application of CdTe and composite nanostructures.