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- W1520353945 abstract "Within this chapter, the principles of numerical solar cell simulation are described, using AFORS-HET (automat for simulation of heterostructures). AFORS-HET is a one dimensional numerical computer program for modelling multi layer homoor heterojunction solar cells as well as some common solar cell characterization methods. Solar cell simulation subdivides into two parts: optical and electrical simulation. By optical simulation the local generation rate ) , ( t G x within the solar cell is calculated, that is the number of excess carriers (electrons and holes) that are created per second and per unit volume at the time t at the position x within the solar cell due to light absorption. Depending on the optical model chosen for the simulation, effects like external or internal reflections, coherent superposition of the propagating light or light scattering at internal surfaces can be considered. By electrical simulation the local electron and hole particle densities ) , ( ), , ( t p t n x x and the local electric potential ) , ( t x φ within the solar cell are calculated, while the solar cell is operated under a specified condition (for example operated under open-circuit conditions or at a specified external cell voltage). From that, all other internal cell quantities, such like band diagrams, local recombination rates, local cell currents and local phase shifts can be calculated. In order to perform an electrical simulation, (1) the local generation rate ) , ( t G x has to be specified, that is, an optical simulation has to be done, (2) the local recombination rate ) , ( t R x has to be explicitly stated in terms of the unknown variables φ , , p n , ( ) φ , , ) , ( p n f t R = x . This is a recombination model has to be chosen. Depending on the recombination model chosen for the simulation, effects like direct band to band recombination (radiative recombination), indirect band to band recombination (Auger recombination) or recombination via defects (Shockley-Read-Hall recombination, dangling-bond recombination) can be considered. In order to simulate a real measurement, the optical and electrical simulations are repeatedly calculated while changing a boundary condition of the problem, which is specific to the measurement. For example, the simulation of a i-V characteristic of a solar cell is done by calculating the internal electron and hole current (the sum of which is the total current) as a function of the externally applied voltage. Source: Solar Energy, Book edited by: Radu D. Rugescu, ISBN 978-953-307-052-0, pp. 432, February 2010, INTECH, Croatia, downloaded from SCIYO.COM" @default.
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- W1520353945 date "2010-02-01" @default.
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- W1520353945 title "Numerical Simulation of Solar Cells and Solar Cell Characterization Methods: the Open-Source on Demand Program AFORS-HET" @default.
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- W1520353945 doi "https://doi.org/10.5772/8073" @default.
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