Beneficial impact of a thin tunnel barrier in quantum well intermediate-band solar cell
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Based on electronic quantum transport modeling, we study the transition between the intermediate-band and the conduction-band in nano-structured intermediate-band solar cell. We show that a tunnel barrier between the quantum well (QW) and the host material could improve the current. The confinement generated by such a barrier favors the inter-subband optical coupling in the QW and then changes the excitation-collection trade-off. More surprisingly, we also show that tunneling impacts the radiative recombination and then the voltage. Using a detailed balance model we explain and we propose a broadening factor for this Voc modification. Finally we show that a thin tunnel barrier is beneficial for both current and voltage.
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2014 ◽
Vol 4
(2)
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pp. 634-638
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2014 ◽
Vol 6
(1)
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pp. 011206
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2021 ◽
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