Light Trapping Textures Designed by Electromagnetic Optimization for Sub-Wavelength Thick Solar Cells. Ganapati, V., Miller, D, O., & Yablonovitch, E. arxiv, 2013. ![Light Trapping Textures Designed by Electromagnetic Optimization for Sub-Wavelength Thick Solar Cells [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex Light trapping in solar cells allows for increased current and voltage, as well as reduced materials cost. It is known that in geometrical optics, a maximum 4n^2 absorption enhancement factor can be achieved by randomly texturing the surface of the solar cell, where n is the material refractive index. This ray-optics absorption enhancement limit only holds when the thickness of the solar cell is much greater than the optical wavelength. In sub-wavelength thin films, the fundamental questions remain unanswered: (1) what is the sub-wavelength absorption enhancement limit and (2) what surface texture realizes this optimal absorption enhancement? We turn to computational electromagnetic optimization in order to design nanoscale textures for light trapping in sub-wavelength thin films. For high-index thin films, in the weakly absorbing limit, our optimized surface textures yield an angle- and frequency- averaged enhancement factor ≈ 39. They perform roughly 30% better than randomly tex- tured structures, but they fall short of the ray optics enhancement limit of 4n2 ≈ 50.
@article{ Ganapati2013,
abstract = {Light trapping in solar cells allows for increased current and voltage, as well as reduced materials cost. It is known that in geometrical optics, a maximum 4n^2 absorption enhancement factor can be achieved by randomly texturing the surface of the solar cell, where n is the material refractive index. This ray-optics absorption enhancement limit only holds when the thickness of the solar cell is much greater than the optical wavelength. In sub-wavelength thin films, the fundamental questions remain unanswered: (1) what is the sub-wavelength absorption enhancement limit and (2) what surface texture realizes this optimal absorption enhancement? We turn to computational electromagnetic optimization in order to design nanoscale textures for light trapping in sub-wavelength thin films. For high-index thin films, in the weakly absorbing limit, our optimized surface textures yield an angle- and frequency- averaged enhancement factor ≈ 39. They perform roughly 30% better than randomly tex- tured structures, but they fall short of the ray optics enhancement limit of 4n2 ≈ 50.},
archiveprefix = {arXiv},
arxivid = {arXiv:1307.5465v1},
author = {Ganapati, Vidya and Miller, Owen D and Yablonovitch, Eli},
eprint = {arXiv:1307.5465v1},
file = {:home/odmiller/Research/Pubs, Papers \& Talks/Journal/Coauthor/Ganapati,SolarCellTextures,July2013,Arxiv.pdf:pdf},
journal = {arxiv},
title = {{Light Trapping Textures Designed by Electromagnetic Optimization for Sub-Wavelength Thick Solar Cells}},
url = {http://arxiv.org/abs/1307.5465},
year = {2013}
}
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It is known that in geometrical optics, a maximum 4n^2 absorption enhancement factor can be achieved by randomly texturing the surface of the solar cell, where n is the material refractive index. This ray-optics absorption enhancement limit only holds when the thickness of the solar cell is much greater than the optical wavelength. In sub-wavelength thin films, the fundamental questions remain unanswered: (1) what is the sub-wavelength absorption enhancement limit and (2) what surface texture realizes this optimal absorption enhancement? We turn to computational electromagnetic optimization in order to design nanoscale textures for light trapping in sub-wavelength thin films. For high-index thin films, in the weakly absorbing limit, our optimized surface textures yield an angle- and frequency- averaged enhancement factor ≈ 39. They perform roughly 30% better than randomly tex- tured structures, but they fall short of the ray optics enhancement limit of 4n2 ≈ 50. -->\n<!-- </div> -->\n<!-- -->\n\n</div>\n","downloads":0,"abstract":"Light trapping in solar cells allows for increased current and voltage, as well as reduced materials cost. It is known that in geometrical optics, a maximum 4n^2 absorption enhancement factor can be achieved by randomly texturing the surface of the solar cell, where n is the material refractive index. This ray-optics absorption enhancement limit only holds when the thickness of the solar cell is much greater than the optical wavelength. In sub-wavelength thin films, the fundamental questions remain unanswered: (1) what is the sub-wavelength absorption enhancement limit and (2) what surface texture realizes this optimal absorption enhancement? We turn to computational electromagnetic optimization in order to design nanoscale textures for light trapping in sub-wavelength thin films. For high-index thin films, in the weakly absorbing limit, our optimized surface textures yield an angle- and frequency- averaged enhancement factor ≈ 39. They perform roughly 30% better than randomly tex- tured structures, but they fall short of the ray optics enhancement limit of 4n2 ≈ 50.","archiveprefix":"arXiv","arxivid":"arXiv:1307.5465v1","author":["Ganapati, Vidya","Miller","D, Owen","Yablonovitch, Eli"],"author_short":["Ganapati, V.","Miller","D, O.","Yablonovitch, E."],"bibtex":"@article{ Ganapati2013,\n abstract = {Light trapping in solar cells allows for increased current and voltage, as well as reduced materials cost. It is known that in geometrical optics, a maximum 4n^2 absorption enhancement factor can be achieved by randomly texturing the surface of the solar cell, where n is the material refractive index. This ray-optics absorption enhancement limit only holds when the thickness of the solar cell is much greater than the optical wavelength. 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