Introducing a Phenomenon of Single Junction Multiple Band-gap Solar Cell Compared to Single Junction or Multi Junction Solar Cell to Achieve High Efficiency
DOI:
https://doi.org/10.18034/abcjar.v2i1.16Keywords:
Band-gap, lattice, HMAs, BAC, electro-negativityAbstract
Besides cost, the most fundamental issue in assessing photovoltaic solar cells is efficiency. The benefits of single-junction solar cells are easier to manufacture, simpler and less expensive to make. However, they are less efficient than multi-junction solar cells. But when different semiconductors are stacked in layers to create multiple junctions, the atoms in the lower layers must not be blocked by the atoms in the upper layers or the sunlight passes by them instead of striking them. That means higher efficiency multi-junction solar cells are difficult to make. From the periodic table, group III-V and group II-VI produce the alloys of direct band-gap semiconductor. If group V anions are partially replaced with nitrogen atom or group VI element is partially replaced with oxygen atom then new semiconductor material is produced that respond to a wider spectrum of frequencies within sunlight. It will make single-junction multiple band-gap solar cell which is more efficient and less expensive to manufacture.
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References
F. Meillaud, A. Shah, C. Droz, E. Vallat-Sauvain, C. Miazza, “Efficiency limits for single junction & tendem solar cells”, Solar Energy Materials and Solar Cells 90, issues 18-19, 2952-2959, 2006.
Kin Man Yu, Wladek Walukiewicz, Wei Shan, and Jeff Beeman; "Diluted II-VI oxide semiconductors with multiple band gaps, Physical Review Letters, 12 December 2003.
Paul Preuss, Berkley Lab Science Beat: A Step Closer to the Optimum Solar Cell;; March 2004.
W. Shan,W.Walukiewicz, J.W. Ager III, E. E. Haller, J. F. Geisz, D. J. Friedman, J.M. Olson, and S. R. Kurtz, Phys. Rev. Lett. 82, 1221(1999).
W. Walukiewicz, “New material for high efficiency solar cells”, ALS Workshop, 10/5/2007,.
Websites:
http://emat-solar.lbl.gov/research/band-anti-crossing-model
http://emat-solar.lbl.gov/research/dilute-nitrides
http://emat-solar.lbl.gov/research/dilute-oxides
http://emat-solar.lbl.gov/research/pulsed-laser-melting-plm
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