Quasi-neutrality means that the excess electron and hole density are essentially equal to each other at each location and are treated as such in the drift-diffusion equations, while acknowledging that a very small difference is present as needed to ensure that the divergence of total current density is zero everywhere. PC3D implements a conductive boundary model with a uniformly doped quasi-neutral bulk. The author asks only that the program be cited in any resulting publications, e.g. The program code is fully open-source and available free of charge. The first public release was version 1.3 late in October 2019. Pre-release testing at a few select sites was conducted starting in July 2019. Microsoft Excel provides the user interface for PC3D, but all calculations are performed in code rather than in spreadsheet formulas for faster solutions. PC3D was initially developed in 2019 as an effort to combine the best user-interface features of PC1D and PC2D in a program that could efficiently model silicon solar cells in three dimensions and provide an effective visual means of exploring the resulting solution.
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