Abstract
This paper reports the results of a study on the effect of N-ion implantation on structure and properties of Magnesium Silicide (Mg2Si) thin film that is known to be a potential thermoelectric (TE) material. Mg2Si thin films of thickness 300 nm have been deposited on the silicon (100) substrate at room temperature using the sputtering technique. The thin films have been subjected to 50 keV N-ion implantation under various fluence values ranging from 5 × 1014 to 1 × 1016 ions/cm2. Structural characterization by X-ray Diffraction (XRD) technique has verified that the pristine thin film is constituted by a crystalline single phase Mg2Si material; however, ion irradiation leads to partial amorphization of the Mg2Si thin film. Field–Emission Scanning Electron Microscopy (FE-SEM) with Energy Dispersive Spectroscopy (EDS) is employed to obtain microstructural and compositional information. While particle coarsening due to ion implantation is affirmed by FESEM observation, the EDS study cannot authenticate the exact stoichiometry of the film due to substrate effect. X-ray Photoelectron Spectroscopy (XPS) study was conducted to secure information about the chemical state of the elements at the film surface which confirms the presence of Mg2Si phase in the pristine film; and of both Mg2Si and nitrogen in the implanted thin films. The electrical transport behavior of Mg2Si thin films have been studied by way of I-V and Hall measurements; the conductivity values are found to increase from 6*102 S/m to 1.17*103 S/m as the fluence is raised from 5 × 1014 to 1 × 1016 ions/cm2 at a temperature of 150 °C. The electrical conductivities of all the samples are seen to increase continuously with increasing temperature thereby, showing semiconducting behavior of the thin films.
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Acknowledgements
The authors are grateful to the Inter-University Accelerator Center for providing the ion implantation facilities at their institute. The authors would like to acknowledge Materials Research Center facility at MNIT Jaipur for characterization facilities.
Funding
This work was supported by UGC-IUAC (Inter University Accelerator Center, Grant No: 62334) for implantation on Mg Silicide thin films.
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Suniksha Gupta performed the experiment which included the synthesis of the films, implantation (at IUAC, New Delhi) and their characterization. Further the original draft was also prepared by her which includes the plotting and analysis of experimental data. Data conceptualization for XRD, XPS, I-V, SEM, was concluded by her. The data curation for the manuscript was carried forward by her. Smita Howlader assisted in draft preparation and the XRD analysis. Further formal analysis of the data and conceptualization was looked by her. Satyavir Singh assisted in the whole implantation process which includes SRIM/TRIM software, selecting energy of particular ions and their analysis part. Atul Sharma helped in the deposition of films and optimization of process parameters hence the methodology to get good quality films. M.K. Banerjee mentored the synthesis part, providing guidance through the problems encountered and corrected the manuscript. K. Asokan was involved in discussions regarding the complete work and also looked after the XRD, I-V and Hall data analysis part. The project was conceptualized by Kanupriya Sachdev. The final approval of the manuscript after thorough checking of all the important aspects i.e., reporting of synthesis process, data analysis and further reviewed by her. The research work was done under the supervision of Kanupriya Sachdev, M.K. Banerjee and K. Asokan with their constant support we were able to achieve the required results. The research was funded by a project granted from IUAC (Project. No. 62334). MRC, MNIT allowed to use the resources for the research work. Software’s used to plot the data was Origin, Casa, and MS Office.
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Gupta, S., Howlader, S., Singh, S. et al. A Study on the Effect of 50 keV Nitrogen Ion Implantation in Mg2Si Thin Films. Silicon 15, 6521–6532 (2023). https://doi.org/10.1007/s12633-023-02521-4
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DOI: https://doi.org/10.1007/s12633-023-02521-4