Solar cell with an intermediate band of finite width

Physical Review B - Condensed Matter and Materials Physics

Volumn 78, Issue 16, 2008, Pages

  Levy, Michael Y ^a   Honsberg, Christiana ^b  

^a UNIVERSIDAD POLITÉCNICA DE MADRID   (Spain)

^b UNIVERSITY OF DELAWARE   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 55449092961     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.78.165122     Document Type: Article

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36. Please note that the efficiencies that the authors present here are first-law efficiencies that are given as the photovoltaic power density generated by the converter divided by the total-energy flux impinging on the converter. Resulting from this, the efficiencies for nonconcentrated (×1) solar illumination that are reported elsewhere in the literature may be roughly 1.3 times larger than those that are reported here (cf. efficiencies reported in Refs.). As explained in Ref., a second-law efficiency calculation that includes the energy flux from the Sun and that excludes the energy flux from the Earth will result in a distorted efficiency that is a factor [1+ (1-CD CD) (TE / TS) 4] larger than a calculation using the first-law efficiency that includes both. With respect to this factor, C and D are the geometric concentration and dilution factors, respectively, and TE and TS are the surface terrestrial and solar temperatures, respectively. The smaller the concentration factor is, the more pronounced is the distortion. For example, allowing that D=2.16× 10-5, C=1, TE =300 K, and TS =6000 K, then the distortion is given by a factor of 1+ (4.63× 104) (6.25× 10-6) =1.29.