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Thermodynamic limits of quantum photovoltaic cell efficiency
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View: Figures


Image of FIG. 1.
FIG. 1.

Detailed balance efficiency limit of a quantum solar cell and a homojunction cell as a function of the band gap of the barrier material with . The band gaps of the quantum materials are assumed to equal 60% of the barrier materials. A maximum efficiency of 44.5% for a black body at is found for the quantum confined cells. The various lines correspond to the SQ limit (squares), (circles), (triangles), (inverted triangles), and (diamonds). Upper Inset: conduction band edge of a heterojunction positioned at . Lower Inset: maximum achievable efficiency vs the corresponding band gap ratio between the quantum and barrier materials.

Image of FIG. 2.
FIG. 2.

Current density vs voltage characteristics under unconcentrated solar illumination for a quantum solar cell with barrier and well band gaps of and , respectively. Also shown are the calculations for a homojunction solar cell with a band gap of . Here, is the quasi-Fermi level splitting between the barrier and quantum materials.

Image of FIG. 3.
FIG. 3.

Entropy generation rate multiplied by the ambient temperature for a quantum confined cell with a barrier energy gap of and a well energy gap of at various quasi-Fermi level splittings . The irradiator and ambient temperatures are assumed at and , respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermodynamic limits of quantum photovoltaic cell efficiency