Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Solar cell technology is changing. New efficiency records are being set. Alta Devices has reached 28.8% efficiency in a thin film single-junction cell at 1-sun, and 30.8% efficiency in a thin-film dual junction cell at 1-sun.
Counter-intuitively, efficient external fluorescence is a necessity for approaching the ultimate limits. A great Solar Cell also needs to be a great Light Emitting Diode. Why would a solar cell, intended to absorb light, benefit from emitting light? Although it is tempting to equate light emission with loss, paradoxically, light emission actually improves the open-circuit voltage, and the efficiency.
The single-crystal thin film technology that achieved these high efficiencies, is created by epitaxial liftoff, and can be produced at cost well below the other less efficient thin film solar technologies. The path is now open to a 30% efficient photovoltaic technology, that can be produced at low cost.
In principle, organic photovoltaics can also achieve this performance level. The internal fluorescence efficiency is already adequate, but other physical improvements will be needed.
“Intense Internal and External Fluorescence as Solar Cells Approach the Shockley-Queisser Efficiency Limit”, O. D. Miller, Eli Yablonovitch, and S. R. Kurtz, IEEE J. Photovoltaics, vol. 2, pp. 303-311 (2012). “The Opto-Electronics of Solar Cells”, E. Yablonovitch and O. D. Miller, IEEE Photonics Society Newsletter, vol. 27, No. 1, p. 4, (February 2013).
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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