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Enhancing photocell power by noise-induced coherence

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We show that coherence induced by Fano interference can enhance the power produced by photovoltaic devices, e.g. photodetectors and solar cells, as compared to the same system with no coherence. No additional external energy source is necessary to create such induced coherence. In the present model, coherence generated by photocurrent increases (for optically thin cells) the flow of electrons through the load, which reduces radiative recombination and enhances cell power. We discuss two schemes in which coherence is generated between upper or lower energy levels. We also study the influence of decoherence, τa, on cell power and show that one can design a device with Fano enhancement even at relatively large decoherence rates. Finally we investigate the effect of ambient temperature Ta on the cell power in a scheme with no interference and show that for certain parameters power can be increased by increasing Ta.
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