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Thermoelectrical Field Effects in Low Dimensional Structure Solar Cells

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arxiv cond-mat/0212556 v1 pith:OATQHBUS submitted 2002-12-23 cond-mat.mtrl-sci cond-mat.mes-hall

Thermoelectrical Field Effects in Low Dimensional Structure Solar Cells

classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords cellssolartemperaturebeyondefficiencyincreasedaccountappl
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Taking into account the temperature gradients in solar cells, it is shown that their efficiency can be increased beyond the Shockley-Queisser limit (J. Appl. Phys. 32 (1961) 510). The driving force for this gain is the temperature gradient between this region and its surroundings. A quantitative theory is given. Though the effect is found to be weak in conventional solar cells, it is argued that it can be substantially increased by proper choice of materials and design of the device. In particular, it is shown that the insertion of a quantum well can enhance the efficiency beyond one of the single gap cell, due to the presence of temperature jumps at the heterojunctions.

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