Study on Al x Ga 1-x As nanocones with variable Al composition structures for highly efficient light trapping
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ORIGINAL ARTICLE
Study on AlxGa1‑xAs nanocones with variable Al composition structures for highly efficient light trapping Lei Liu1 · Yu Diao1 · Sihao Xia1 Received: 9 June 2020 / Accepted: 17 July 2020 © King Abdulaziz City for Science and Technology 2020
Abstract In this study, various AlxGa1-xAs nanostructure arrays with variable Al composition are proposed and designed for highly efficient light capture. The optical properties of the proposed nanocone array with variable Al composition have been numerically investigated by COMSOL Multiphysics package based on the finite element method (FEM), and compared with the counterparts of cylinder and conical frustum. The results show that the variable composition A lxGa1-xAs nanocones with uniform sublayer distribution thickness can obtain an ultimate efficiency of 37.3%, which is higher than that of the cylindrical and conical frustum structures under the same conditions. In addition, the effects of geometric parameters of nanostructures on the light absorption of nanoarrays with different shape changing components are studied. Taking the variable component AlxGa1-xAs nanocone structure as an example, increasing the Al component range in the axial direction of the nanocone can significantly improve the absorption of short-wavelength light, which increases the overall absorption efficiency. In addition, for a specific Al composition distribution range, a uniform thickness distribution design of unit sub-layer in nanocone along the z-axis direction can provide optical absorption enhancement of more than 1.8% and 0.9% over than the decreasing and increasing distribution design. The design principles proposed in this work will provide a reference for selecting appropriate parameters in solar cell applications. Keywords Variable al composition · Nanocones · Optical absorption · Finite element method
Introduction Solar energy has broad application prospects in the field of energy power generation due to its universality, harmlessness, large reserves and long-term use. To obtain higher conversion efficiency, the development of solar energy technology has also attracted extensive attention. In 2010, Schwede et al. (2010) proposed a new concept of solar energy collection, namely the photon-enhanced thermal electron emission (PETE) method. This method can fully combine the photovoltaic effect and thermionic effect to achieve maximum energy conversion, which will provide a way for affordable renewable energy. Since the introduction of PETE technology, how to develop high-efficiency photocathode has been a key challenge. Since then, people * Lei Liu [email protected] 1
Department of Optoelectronic Technology, School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
have dedicated themselves to improving the performance of the device, and have proposed various models and structures (Westover et al. 2010; Segev et al. 2015; Sandovsky et al. 2016). AlxGa1-xAs/GaAs has a variable band gap structure and has
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