Wannier–Frenkel hybrid exciton in organic–semiconductor quantum dot heterostructures

Birman, Joseph L.; Huong, Nguyen Que

doi:10.1016/j.jlumin.2006.08.030

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…e proposed model is consistent with the experimentally verified carrier dynamics model shown in reference [28]. Due to this irregular arrangement, the exciton in this work can only be treated as a hybrid type of the Frenkel and Wannier exciton [29]. Figure 2(c) shows the coupling distance distribution among electrons and holes.…”

Section: Theoretical Simulation Schemessupporting

confidence: 83%

“…In this work, instead of calculating the eigenvalue directly, the excitonic distribution is represented as the distribution of exciton radius, i.e., the distance between the electron and hole based on the following consideration: e ultrahigh density of QD array studied in this Advances in Condensed Matter Physics work could be treated as a pseudo-two-dimensional quantum well structure due to the strong coupling between neighboring QDs. Moreover, meanwhile, the exciton binding energy of quantum well can be approximated as Eexciton ≈ − (ε r r eh ) − 1 based on formulas (28), (29), and (31) in reference [25], where ε r is the dielectric constant and r eh is the mean electron-hole distance. Experimentally, the exciton binding energy can be estimated from the PL peak energy using the following relation: E exciton � E G (orE HOMO− LUMO ) − E PL .…”

Section: Theoretical Simulation Schemesmentioning

confidence: 99%

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Quantum Dot Phase Transition Simulation with Hybrid Quantum Annealing via Metropolis-Adjusted Stochastic Gradient Langevin Dynamics

Shiba

Sugiyama

Yamaguchi

et al. 2022

Advances in Condensed Matter Physics

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We report a hybrid quantum-classical simulation approach for simulating the optical phase transition observed experimentally in the ultrahigh-density type-II InAs quantum dot array. A hybrid simulation scheme, which contains stochastic gradient Langevin dynamics (a well-known Bayesian machine learning algorithm for big data) along with adiabatic quantum annealing, is developed to reproduce the experimentally observed phase transition. By implementing the simulation scheme into a quantum circuit, we successfully verified the phase transition observed in the experiment. Our work demonstrates for the first time the feasibility of hybridizing quantum computation with classical Langevin dynamics for the analysis of carrier dynamics and quantum phase transition of the quantum dot.

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Section: Theoretical Simulation Schemessupporting

confidence: 83%

Section: Theoretical Simulation Schemesmentioning

confidence: 99%

Quantum Dot Phase Transition Simulation with Hybrid Quantum Annealing via Metropolis-Adjusted Stochastic Gradient Langevin Dynamics

Shiba

Sugiyama

Yamaguchi

et al. 2022

Advances in Condensed Matter Physics

View full text Add to dashboard Cite

show abstract

“…acceptor materials. [16][17][18] The vibrational energy released due to the formation of CT excitons acts as the external energy to completely dissociate the CT excitons into free charge carries if it exceeds the binding energy of excitons. 18 These free charge carries are then transported to and collected on the respective electrodes.…”

Section: Introductionmentioning

confidence: 99%

Optimization of molecular organization and nanoscale morphology for high performance low bandgap polymer solar cells

Wang

Lin

et al. 2014

Nanoscale

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Rational design and synthesis of low bandgap (LBG) polymers with judiciously tailored HOMO and LUMO levels have emerged as a viable route to high performance polymer solar cells with power conversion efficiencies (PCEs) exceeding 10%. In addition to engineering the energy-level of LBG polymers, the photovoltaic performance of LBG polymer-based solar cells also relies on the device architecture, in particular the fine morphology of the photoactive layer. The nanoscale interpenetrating networks composed of nanostructured donor and acceptor phases are the key to providing a large donor-acceptor interfacial area for maximizing the exciton dissociation and offering a continuous pathway for charge transport. In this Review Article, we summarize recent strategies for tuning the molecular organization and nanoscale morphology toward an enhanced photovoltaic performance of LBG polymer-based solar cells.

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“…For inorganic bulk materials, in which the Bohr radius is larger than the lattice spacing, Wannier–Mott excitons with a weak binding energy are generated. For inorganic NCs, however, the exciton Bohr radius is comparable to the NC size, and the photogenerated electron–hole pairs are bound by Coulomb force, leading to the formation of Frenkel excitons. , These Frenkel excitons need to be dissociated by the energy offset between the highest occupied molecular orbital (HOMO) of the CP donor and the ionization potential (i.e., the valence band edge) of the NC acceptor at the donor/acceptor interface . Therefore, the PCE of organic–inorganic hybrid solar cells relies largely on the electronic band structures of both donor and acceptor materials, as well as the energy-level alignment at the donor/acceptor interface.…”

mentioning

confidence: 99%

Toward High-Performance Organic–Inorganic Hybrid Solar Cells: Bringing Conjugated Polymers and Inorganic Nanocrystals in Close Contact

Qiu

Lin

2013

J. Phys. Chem. Lett.

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Organic-inorganic hybrid solar cells composed of conjugated polymers (CPs) and inorganic nanocrystal (NC) semiconductors have garnered considerable attention as a potential alternative to traditional silicon solar cells due to the capacity of producing high-efficiency solar energy in a cost-effective manner. The combination of advantageous characteristics of CPs and NCs enables the construction of nanostructured high-performance, lightweight, flexible, large-area, and low-cost hybrid solar cells. However, it remains a grand challenge to control the film morphology and interfacial structure of such organic/inorganic semiconductor blends on the nanoscale. In this Perspective, we highlight the strategies of implementing close contact between CPs and NCs by tailoring the colloidal synthesis, the coordination reaction, and the chemical modification of CPs. As such, they offer promising opportunities for rationally controlling the phase separation between electron-donating CPs and electron-accepting NCs, increasing the interfacial areas between them, enhancing their electronic interaction, and thus substantially promoting the photovoltaic performance of the resulting organic-inorganic hybrid solar cells.

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Wannier–Frenkel hybrid exciton in organic–semiconductor quantum dot heterostructures

Cited by 13 publications

References 10 publications

Quantum Dot Phase Transition Simulation with Hybrid Quantum Annealing via Metropolis-Adjusted Stochastic Gradient Langevin Dynamics

Quantum Dot Phase Transition Simulation with Hybrid Quantum Annealing via Metropolis-Adjusted Stochastic Gradient Langevin Dynamics

Optimization of molecular organization and nanoscale morphology for high performance low bandgap polymer solar cells

Toward High-Performance Organic–Inorganic Hybrid Solar Cells: Bringing Conjugated Polymers and Inorganic Nanocrystals in Close Contact

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