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app:sinw [2018/02/02 11:17] pklapetek |
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| In this application example we calculate the field distribution in a silicon nanowires based solar cell. This is one of many advanced options how to construct better solar cells. As the solar cell performance highly depends on the local absorption of light, FDTD can be an useful tool for exploring in which regions of the sample the light gets absorbed. | In this application example we calculate the field distribution in a silicon nanowires based solar cell. This is one of many advanced options how to construct better solar cells. As the solar cell performance highly depends on the local absorption of light, FDTD can be an useful tool for exploring in which regions of the sample the light gets absorbed. | ||
| - | The example shown here is related to structures related to Ref. 1. | + | {{:app:j_sinw.png?400 |}} |
| - | + | The example shown here is related to radial junction solar cell structures presented in Ref. 1. | |
| - | Two different models were constructed as shown on the right image. They always consist of several materials (TCO that was handled as ITO, amorphous silicon, crystalline silicon that was treated as Si 100 and eventually also a Sn nanoparticle on the top of the NW that was treated as perfect electric conductor). In model "A" a periodic array of structured is created using single NW/aSi/ITO column and periodic boundary conditions. This can be used to evaluate effect of column spacing films thicknesses, length or tilt on resulting structure performance. In model "B" 3x3 differently tilted columns are used as basic building block for periodic array construction. This is useful to estimate effects of random column orientation. In principle this could be expanded up to 7x7 array basic building block, however for even larger building blocks the computation would be too long and memory demanding. | + | Two different models were constructed as shown on the left image. In model "A" a periodic array of structured is created using single NW/aSi/ITO column and periodic boundary conditions. This can be used to evaluate effect of column spacing films thicknesses, length or tilt on resulting structure performance. In model "B" 3x3 differently tilted columns are used as basic building block for periodic array construction. This is useful to estimate effects of random column orientation. In principle this could be expanded up to 7x7 array basic building block, however for even larger building blocks the computation would be too long and memory demanding. |
| All the optical data were taken from SOPRA database. Structure was illuminated from top or from bottom by a linearly polarised plane wave. Glass at the bottom of the structure was treated as infinitely extending. Voxel spacing was 7 nm. | All the optical data were taken from SOPRA database. Structure was illuminated from top or from bottom by a linearly polarised plane wave. Glass at the bottom of the structure was treated as infinitely extending. Voxel spacing was 7 nm. | ||
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| Geometrical parameters of a single column were as follows in first set of simulations (radii of nested cylinders capped by spheres and apparent thickness of the film if seen from side): | Geometrical parameters of a single column were as follows in first set of simulations (radii of nested cylinders capped by spheres and apparent thickness of the film if seen from side): | ||
| - | material cylinder radius film thickness | + | ^ material ^ cylinder radius ^ film thickness ^ |
| - | Si NW 28 nm | + | | Si NW | 28 nm | | |
| - | (i) a:Si-H 161 nm 67 nm | + | | (i) a:Si-H | 161 nm | 67 nm | |
| - | (n) a:Si-H 182 nm 11 nm | + | | (n) a:Si-H | 182 nm | 11 nm | |
| - | TCO 350 nm 84 nm | + | | TCO | 350 nm | 84 nm | |
| Bottom ITO thickness was 630 nm. All these parameters can be changed and were considered only as initial values, a bit smaller than ideal values, to speed up the first test calculations. | Bottom ITO thickness was 630 nm. All these parameters can be changed and were considered only as initial values, a bit smaller than ideal values, to speed up the first test calculations. | ||
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| The same model 3D view including better probe sketch is shown below: (left) geometry, (center) 400 nm illumination, (right) 600 nm illumination, | The same model 3D view including better probe sketch is shown below: (left) geometry, (center) 400 nm illumination, (right) 600 nm illumination, | ||
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| + | [1] A. Fejfar, M. Hývl, A. Vetushka, P. Pikna, Z. Hájková, M. Ledinský, J. Kočka, P. Klapetek, A. Marek, A. Mašková, J. Vyskočil, J. Merkel, C. Becker, T. Itoh, S. Misra, M. Foldyna, LW. Yu, P. R. I Cabarrocas, Correlative microscopy of radial junction nanowire solar cells using nanoindent position markers, Solar Energy Materials and Solar Cells 135 (2015) 106-112 | ||
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app/sinw.txt · Last modified: 2018/08/30 10:12 by pklapetek
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