―119―Recently, the integration of two-dimensional (2D) materials in thermoelectrics, photovoltaics, and optical devices offer opportunities to tackle challenges in energy applications. Various 2D materials, such as graphene, black phosphorus, transition metal dichalcogenides, and MXenes, have flexibility, a large surface area, and chemical stability. In addition, their excellent electrical and thermal conductivities make them promising for portable and wearable energy devices. In this study, we found the monolayer GeTe exhibits remarkable thermoelectric performance compared to the other GeTe phases due to a combination of electronic band convergence and unique 2D density of states [1]. We also proposed a switching device of a heterostructure based on periodically doped graphene nanoribbon that operates at room temperature and low-power consumption [2]. The 2D materials were also investigated for the optical devices. By applying strain engineering and electric field, we can control the optical absorption in visible light of the monolayer γ-GeX (X = S, Se, Te), as shown in Fig. 1 [3]. We also collaborated with experimental groups to investigate the effect of circularly polarized light on Raman spectra of the 2D materials [4, 5]. Therefore, our research results are multidisciplinary, which includes many different fields such as materials, thermoelectricity, and optics. [2]S. Wang, N. T. Hung, H. Tian, M. S. Islam and R. Saito, Switching behavior of a heterostructurebased on periodically doped graphene nanoribbon, Phys. Rev. Appl. 16, 024030 (2021).[3]V. V. Thanh, N. D. Van, D. V. Truong and N. T. Hung, Effects of strain and electric field onelectronic and optical properties of monolayer γ-GeX (X = S, Se and Te), Appl. Surf. Sci. 582,152321-1-10 (2022).[4]S. Han*, Y. Zhao*, N. T. Hung*, B. Xu, R. Saito, J. Zhang and L. Tong, Complex Raman tensor inhelicity‑changing Raman spectra of black phosphorus by circularly polarized light, J. Phys. Chem.Lett. 13, 1241–1248 (2022). (* Equal contribution)[5]R. Saito, M. S. Ukhtary, S. Wang and N. T. Hung, Selection rule for Raman spectra of two‐dimensional materials using circularly‐polarized vortex light, Phys. Chem. Chem. Phys. 23, 17271-17278 (2021).References [1]W. V. Sinambela, S. A. Wella, F. S. Arsyad, N. T. Hung and A. R. T. Nugraha, Electronic, optical,and thermoelectric properties of bulk and monolayer germanium tellurides, Crystals 11, 1290‐1‐12(2021).Nguyen Tuan Hung, Creative Interdisciplinary/Materials and Energy Figure 1: Optical properties of the 2D γ-GeX (X = S, Se, Te) can be controlled by the strain and electric field. Two-dimensional materials for energy applications
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