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Using the non equilibrium Green functions formalism we propose a study of theelectronic excitation and collection in nano-structured intermediate-band solarcell. We demonstrate that a thin tunnel barrier between the nano-objects andthe host material is beneficial for both current and voltage. For the current,the confinement generated by such a thin barrier favors the intersubbandoptical coupling in the nano-objects and then improves theexcitation-collection trade-off. We also show that a broadened density-of-statein the nano-objects increases the radiative recombination and then degrades thevoltage. Using a detailed balance model we propose a broadening factor for thisVoc degradation which decreases when a tunnel barrier enhances the life-time inthe nano-objects.

Beneficial impact of tunneling in nano-structured intermediate-band solar cell