Voronoi network modelling of multicrystalline silicon solar cells
| Autor: | C Donolato |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Photocurrent
Diffusion equation Silicon Chemistry business.industry chemistry.chemical_element Condensed Matter Physics Electronic Optical and Magnetic Materials Computational physics Optics Saturation current Materials Chemistry Grain boundary Electrical and Electronic Engineering Diffusion (business) Voronoi diagram business Dark current |
| Zdroj: | Semiconductor Science and Technology. 15:15-23 |
| ISSN: | 1361-6641 0268-1242 |
| DOI: | 10.1088/0268-1242/15/1/303 |
| Popis: | A model of a multicrystalline silicon solar cell with columnar grains having different carrier recombination properties is constructed from a two-dimensional Voronoi network. The prismatic grains are approximated by cylinders embedded in an effective medium with diffusion length Le , and the charge collection probability (r ) within each grain is calculated by solving a three-dimensional diffusion equation. The value of Le is calculated self-consistently through the integral of over the cell volume. The function also allows the calculation of the contribution of the base to the reverse saturation current of the cell. Numerical examples illustrate the influence of areal inhomogeneities and grain boundary recombination on the value of Le , dark current and open-circuit voltage. It is found that small-area grains with low lifetime mainly reduce the open-circuit voltage without significantly lowering Le and the photocurrent. Histograms obtained for multicrystalline cells by the light beam induced current technique are simulated and compared with experiment. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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