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Hot carrier solar cells: Achievable efficiency accounting for heat losses in the absorber and through contacts
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10.1063/1.3489405
/content/aip/journal/apl/97/11/10.1063/1.3489405
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/11/10.1063/1.3489405
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of a hot carrier solar cell. Electron–hole pairs are photogenerated in the absorber and kept hot (temperature , is the ambient temperature) where the thermalization rate with the lattice is slow enough. They are ideally extracted through energy selective contacts with a narrow transmission range for minimal heat flux with an extraction energy close to . are the electron and hole chemical potential, respectively, in the absorber, and are the Fermi levels in the electrodes.

Image of FIG. 2.
FIG. 2.

Conversion efficiency vs extraction energy at various thermalization rates, for a 1 eV band gap absorber under full concentration with highly selective contacts . : no thermalization in the absorber, : fast thermalization. A value of was measured with GaAs quantum wells samples (Ref. 7). is the average energy of absorbed photons, i.e., 1.91 eV for a 6000 K black body spectrum.

Image of FIG. 3.
FIG. 3.

Efficiency (circles) and losses (heat losses in absorber: squares, heat flux at contacts: up triangles) vs contact selectivity for a 1 eV absorber under full concentration of sun light with suppressed thermalization (filled markers) or with a thermalization factor (empty markers). The extraction energy is optimized for each value of the thermalization factor and for a transmission range .

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/content/aip/journal/apl/97/11/10.1063/1.3489405
2010-09-16
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hot carrier solar cells: Achievable efficiency accounting for heat losses in the absorber and through contacts
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/11/10.1063/1.3489405
10.1063/1.3489405
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