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Carnot factor in solar cell efficiencies

Carnot factor in solar cell efficiencies
Carnot factor in solar cell efficiencies
We study the dependence of solar cell efficiency on the illumination factor G, which governs the solid angle subtended by the radiation source at the cell. While the 2?-geometry (or, equivalently, maximum illumination factor G = 1) yields a Carnot factor, this disappears in more general cases when G lies between zero and one and the cell receives both solar and ambient radiation. The Carnot factor also applies to cells with particular angularly selective absorption properties and this can be made obvious even in the more general case, for which a new efficiency formula is found here. This is achieved by a simple algebraic transformation. In this way, the connection between the thermodynamic and statistical mechanical approach to solar cell efficiencies emerges very clearly. The illumination factor is subsequently defined for an arbitrary radiation source and the theory is applied in the case of moonlight.
0022-3727
3004-3008
Landsberg, P.T.
430ba980-a590-4d7c-8c03-9ecf192c21d3
Badescu, V.
3a1a0634-9195-47d7-9c0b-ea6b5f80ea65
Landsberg, P.T.
430ba980-a590-4d7c-8c03-9ecf192c21d3
Badescu, V.
3a1a0634-9195-47d7-9c0b-ea6b5f80ea65

Landsberg, P.T. and Badescu, V. (2000) Carnot factor in solar cell efficiencies. Journal of Physics D: Applied Physics, 33 (22), 3004-3008. (doi:10.1088/0022-3727/33/22/320).

Record type: Article

Abstract

We study the dependence of solar cell efficiency on the illumination factor G, which governs the solid angle subtended by the radiation source at the cell. While the 2?-geometry (or, equivalently, maximum illumination factor G = 1) yields a Carnot factor, this disappears in more general cases when G lies between zero and one and the cell receives both solar and ambient radiation. The Carnot factor also applies to cells with particular angularly selective absorption properties and this can be made obvious even in the more general case, for which a new efficiency formula is found here. This is achieved by a simple algebraic transformation. In this way, the connection between the thermodynamic and statistical mechanical approach to solar cell efficiencies emerges very clearly. The illumination factor is subsequently defined for an arbitrary radiation source and the theory is applied in the case of moonlight.

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Published date: 2000

Identifiers

Local EPrints ID: 29491
URI: http://eprints.soton.ac.uk/id/eprint/29491
ISSN: 0022-3727
PURE UUID: 304dea3b-ff37-4d5f-b4a8-4f50508a170e

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Date deposited: 20 Jul 2006
Last modified: 08 Jan 2022 03:52

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Contributors

Author: P.T. Landsberg
Author: V. Badescu

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