High quantum yields generated by a multi-band quantum dot photocell

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Recent evidence suggests that the multiple charge-separation pathways can contribute to photosynthetic performance. In this work, the influence of coupled-dipoles on photosynthetic performance was investigated in a two-charge separation pathways quantum heat engine (QHE) model. And the population dynamics of the two coupled sites, j–V characteristics, and power involving this photosynthetic QHE model were evaluated for the photosynthetic performance. The results illustrate that the photosynthetic performance can be greatly enhanced but quantum interference is deactivated by the coupled-dipoles between the two-charge separation pathways. However, the photosynthetic performance can also be promoted by the deactivated quantum interference owing to the coupled-dipoles. It is a novel role of the coupled-dipoles in the energy transport process of biological photosynthetic, and some artificial strategies may be motivated by this photosynthetic QHE model in the future.

“…Considering the above modes and ambient reservoirs linearly coupled to the electrical system, [37,39] the interaction Hamiltonian can be written in rotating-wave approximation as follows:…”

Section: Model and Equationmentioning

confidence: 99%

Influence of the coupled-dipoles on photosynthetic performance in a photosynthetic quantum heat engine*

Li¹,

Zhao²

2021

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“…and the voltage of the photocell can written, with respect to the energy levels and populations, as [15,24,25] eV…”

Section: The Photocell Model With Two Electron Donorsmentioning

confidence: 99%

“…The photoelectron conversion efficiency [1][2][3][4] is a continuous concern about solar cells or photovoltaic devices. When research of the photoelectric conversion efficiency encounters the bottleneck, [5][6][7][8][9][10][11][12][13][14] scientists turn their interesting to quantum technology, [15][16][17][18][19][20][21][22][23][24][25] and they hoped to break through the efficiency limitation, and further to improve the photoelectric conversion efficiency by means of quantum mechanics.…”

Section: Introductionmentioning

confidence: 99%

Inhibiting radiative recombination rate to enhance quantum yields in a quantum photocell*

Chen¹,

Zhao²

2020

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Inhibiting the radiative radiation is an efficient approach to enhance quantum yields in a solar sell. This work carries out the inhibition of radiative recombination rate (RRR) in a quantum photocell with two coupled donors. We perform explicit calculations of the transition rates, energy gaps and the absorbed solar wavelength-dependent RRR, and find that two different regimes play the crucial roles in inhibiting RRR. One is the quantum coherence generated from two different transition channels, the other includes the absorbed photon wavelength and gaps between the donor and acceptor in this proposed photocell model. The results imply that there may be some efficient ways to enhance the photoelectron conversion compared to the classic solar cell.

“…[21] Because of the prospect of efficient photoelectric conversion efficiency, some studies have been drawn to the quantum photovoltaic behavior in the quantum dot (QD) photocell in the last decade. [22][23][24][25][26][27][28][29] The multi-band QD photocell [26] scheme demonstrated a higher current output due to more absorbed low-energy photons, resulting in a higher output efficiency. The electron tunneling effect between two QDs has been shown to result in the redistribution of populations on two QDs in a DQD photocell, [29] leading to an improvement in photovoltaic properties.…”

Section: Introductionmentioning

confidence: 99%

Delayed response to the photovoltaic performance in a double quantum dots photocell with spatially correlated fluctuation

Zhu¹,

Zhao²,

Xu³

et al. 2023

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A viable strategy for enhancing photovoltaic performance is to comprehend the underlying quantum physical regime of charge transfer in a double quantum dot (DQD) photocell. This work explores the photovoltaic performance dependent spatially correlated fluctuation in a DQD photocell. The effects of spatially correlated fluctuation on charge transfer and output photovoltaic efficiency was explored in a proposed DQD photocell model. The results revealed that the charge transport process and the time to peak photovoltaic efficiency were both significantly delayed by the spatially correlated fluctuation, while the anti-spatially correlated fluctuation reduced the output peak photovoltaic efficiency. Further results revealed that the delayed response could be suppressed by gap difference and tunneling coefficient within two dots. Subsequent investigation demonstrated that the delayed response was caused by the spatial correlation fluctuation which slowed the generative process of noise-induced coherence, which had previously been proven to improve quantum photovoltaic performance in quantum photocells. And the reduced photovoltaic properties were verified by the damaged noise-induced coherence owing to the anti-spatial correlation fluctuation and a hotter thermal ambient environment. The discovery of delayed response generated by the spatially correlated fluctuations will deepen understanding of quantum features of electron transfer, as well as promises to take our understanding even further concerning quantum techniques for high efficiency DQD solar cells.