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Abstract
We introduce a simulator for modeling transport of charge carriers and electrically active defect centers in solar cells by treating them on an equal footing. The details about the solver’s graphical user interface along with numerical algorithms employed are described. The exact non-linear differential equations set solved by our solver is presented. The formulation of such differential equations, namely the continuity equations, drift-diffusion equation and Poisson equation, for studying charge and defect transport is explained. The key challenges we faced in the development process with the numerical accuracy, stability, charge and mass conservation are discussed. The parameters needed for forming the differential equations are taken from first principle calculations. The solver is verified with test cases built on PN hetero-junctions, Cu diffusion in single crystal CdTe and comparing Silvaco simulations with our numerical results. Current solver performance in comparison with our previous generation solver is documented in this paper as well.
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This material is based on the work supported by the US Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office (SETO) Agreement Number DE-EE0007536.
References
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PVRD-FASP: A Unified 2D Solver for Modeling Carrier and Defect Transport in Photovoltaic Devices Abdul R. Shaik et al. Submitted for publication to JPV. |
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