Abstract
We describe a newly developed multiscale computational method, combining quantum mechanics with classical electrodynamics for simulations of photovoltaic devices. In this quantum mechanics/electromagnetics (QM/EM) method, the regions of the system where charge excitation and migration processes take place are treated quantum mechanically, while the surroundings are described by Maxwell’s equations coupled with a semiclassical drift-diffusion model. The QM model and the EM model are solved, respectively, in different regions of the system in a self-consistent manner. Potential distributions and current densities at the interface between QM and EM regions are employed as the boundary conditions for the quantum mechanical and electromagnetic simulations, respectively. In this chapter, we first demonstrate the method by studying the plasmonic scattering and light trapping effects in silicon nanowire array solar cells. Our results show that there exists an optimal nanowire number density in terms of optical confinement. The method is then applied to study a tandem solar cell where the subcells are treated quantum mechanically. The QM/EM simulation results demonstrate that a significant enhancement of open-circuit voltage is achieved by using the tandem architecture.
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Meng, L., Yam, C. (2021). Multiscale Quantum Mechanics/Electromagnetics Method for the Simulation of Photovoltaic Devices. In: Shankar, S., Muller, R., Dunning, T., Chen, G.H. (eds) Computational Materials, Chemistry, and Biochemistry: From Bold Initiatives to the Last Mile. Springer Series in Materials Science, vol 284. Springer, Cham. https://doi.org/10.1007/978-3-030-18778-1_30
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