Effect Of Quantum Effect On Photoelectric Transport Properties In Double Quantum Dots Photocell

Energy and environment are two urgent problems to be solved in the process of human sustainable development,solar energy as a cheap and clean renewable energy provides opportunities for human sustainable development,so solar-based photovoltaic devices have attracted much attention;The low photoelectric conversion efficiency has become the bottleneck of low-cost and popularization of photovoltaic devices,and semiconductor quantum dot(QDs)photovoltaic devices provide the possibility for the realization of high-efficiency photoelectric conversion devices because of their unique quantum effects.Based on this,this paper takes double quantum dots(DQD)photocell as the research object,studies the influence mechanism of quantum effects on photovoltaic performance,and proposes a new strategy for efficient photoelectric conversion.The specific contents are as follows:1.Effect of spatially correlated fluctuation effect on photovoltaic efficiency during DQD photogenerated carrier transport processOne possible strategy to improve photovoltaic performance is to understand the quantum physics of charge transfer in DQD photocell.We use a stochastic process function to characterize conduction band energy level fluctuations caused by spatially correlated noise,and explore the influence of spatially correlated fluctuations on charge transfer and output photovoltaic efficiency in the proposed DQD photocell model.The results show that spatially correlated fluctuations significantly delay the peak time of output current and efficiency.Anti-spatially correlated fluctuations do not involve a delay response,reducing the peak of output photovoltaic efficiency.The delayed response is not clearly observed,and we suspect that the DQD system has a potential self-regulating mechanism.Further results show that the gap energy difference and the tunneling coefficient between the two quantum dots can suppress the delay response,confirming the conjecture that there is an underlying physical mechanism.Subsequent studies have shown that the delayed response is caused by spatially associated fluctuations,which slow down the generation process of noise-induced coherence,and the inverse spatially associated fluctuations and hotter thermal environment destroy the generation of noise-induced coherence,thereby reducing the output photovoltaic characteristics.The discovery of delayed responses generated by spatially correlated fluctuations will deepen the understanding of quantum signatures of electron transfer and is expected to further our understanding of quantum technologies for high-efficiency DQD solar cells.2.Doped quantum dots have optimized characteristics of photoelectric transport characteristics due to structural parameters and environmental changesDetermining the role of physical parameters is one of the methods to experimentally improve the photogenerated carrier transport properties in doped DQD photocell.The formation of intermediate energy levels in double-quantum dots by doping technology can achieve a two-step absorption mechanism in the carrier leap and improve the photoelectric conversion efficiency.The multi-photon absorption process is numerically analyzed to evaluate the photoexcited carrier transport properties and to provide a strategy for designing high-efficiency photovoltaic cells.The results show that some structural parameters induced by doping,such as the energy gap difference between two quantum dots,the incoherent tunneling coupling coefficient,and the vertically aligned structural symmetry,can significantly control the transfer characteristics of photogenerated carriers,and slightly increasing the ambient temperature near room temperature is more favorable to the carrier transfer performance in this doped DQD photocell model.3.The evolution of photovoltaic characteristics was measured from the thermodynamic perspective of DQD photocellIn a photon pulse-driven donor-acceptor DQD photocell model,we attempt to construct a new theoretical approach to evaluate the photovoltaic performance by assessing the thermodynamic evolution of the photovoltaic conversion process in the DQD photocell model.The results show that the evolution process of thermodynamically relevant quantities can reflect the laws of photovoltaic dynamics,which means that the photovoltaic transport properties can be indirectly evaluated by the heat flow of the donor and acceptor and the entropy flow of the acceptor part,while verifying the validity of the second law of thermodynamics and expanding our understanding of the physical laws of thermodynamic quantities in the photovoltaic transport process.In the research work of this paper: the connection between space-related fluctuations and the improvement of quantum coherence of photovoltaic characteristics is elaborated.A theoretical optimization strategy is proposed for the design of doped DQD photocell.The quantum thermodynamic scaling method of photoelectric transport process is theoretically explored,which opens up a new perspective for optimizing photoelectric conversion efficiency.