Different roles of quantum interference in a quantum dot photocell with two intermediate bands

Abstract

It is generally believed that quantum interference can improve the transport of photo-generated carriers in a photocell, thereby improve the photoelectric conversion efficiency. In this work, we explicitly explore different roles of quantum interferences in the photoelectric conversion efficiency in a quantum dot (QD) photocell with two intermediate bands. The increasing transition rates from different charge transport channels bring out first increasing, then decreasing, and then monotonically decreasing photoelectric conversion efficiencies. And the photoelectric conversions increase with quantum coherence generated by the upper transition rates owing to their robust quantum interference. However, the conversion efficiency decrease with the quantum interference induced by two lower-transition rates due to the shortened population lifetime in the intermediate bands. These results provide insight into different roles of quantum interferences in photoelectric conversion efficiency, and may provide some artificial strategies to achieve efficient photoelectric conversion via the adjusted quantum interferences in a QD photocell with multi-intermediate bands.

8 pages, 5 figures

References in corpus (5)

• High Efficiency Carrier Multiplication in PbSe Nanocrystals: Implications for Solar Energy
• Single-photon superradiance from a quantum dot
• Non-Resonant Below-Bandgap Two-Photon Absorption in Quantum Dot Solar Cells
• Enhanced quantum yields and efficiency in a quantum dot photocell modeled by a multi-level system
• High quantum yields generated by a multi-band quantum dot photocell

Cited by in corpus (4)

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