Transport in random quantum dot superlattices

Gomez, Ignacio S.; Domı́nguez-Adame, F.; Díez, E.; Orellana, P. A.

doi:10.1063/1.1503393

Cited by 23 publications

(11 citation statements)

References 11 publications

(19 reference statements)

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“…At the same time, our results can be extended to realistic QDS with some degree of disorder as long as the miniband width is larger than the total inhomogeneous broadening. A recent theoretical study based on a solution of the Daniel-Duke equation 11 for disordered QDS has shown that even large configurational disorder ͑about 1/8th of QD size͒ can be neglected, while morphological disorder leads to broadening of conductance peaks but does not completely destroy the minibands.…”

mentioning

confidence: 99%

Mechanism for thermoelectric figure-of-merit enhancement in regimented quantum dot superlattices

Balandin

Lazarenkova

2003

Applied Physics Letters

160

114

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We propose a mechanism for enhancement of the thermoelectric figure-of-merit in regimented quantum dot superlattices. A proof-of-concept calculation has been carried out for p-type regimented superlattice of Ge dots on Si. It is shown that when conditions for miniband formations are satisfied, carrier transport in such structures can be tuned in a favorable way leading to large carrier mobility, Seebeck coefficient, and, as a result, to the thermoelectric figure-of-merit enhancement. To maximize the improvement, one has to tune the parameters of quantum dot superlattice in such a way that electrical current is mostly through the well-separated minibands of relatively large width ͑at least several k B T, where k B is Boltzmann's constant and T is temperature͒.

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mentioning

confidence: 99%

Mechanism for thermoelectric figure-of-merit enhancement in regimented quantum dot superlattices

Balandin

Lazarenkova

2003

Applied Physics Letters

160

114

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“…However, in theoretical calculations [11] of an ideal QD array forming an intermediate band the density of states has a roll-off at the high and low energy edges. If we factor in non-idealities of QD size and location [13] one would expect these 'tails' to be more pronounced in a real IE formed by a QD array in a manner analogous to amorphous semiconductors [14]. The presence of these band tails is twofold; firstly there will be absorption involving these states meaning a distorted absorption profile, secondly, the emission profile will now be dependent on the band tail states.…”

Section: Band Tailsmentioning

confidence: 98%

Intermediate band solar cell with non-ideal band structure under AM1.5 spectrum

Bremner

Honsberg

2012

2012 38th IEEE Photovoltaic Specialists Conference

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The limiting efficiency of an intermediate band solar cell with a non-ideal band structure is analyzed using the principle of detailed balance. Firstly, the impact of finite band width on the optimum band gap design for AM1.5 spectrum is examined. It is found that the band width may be a determining factor in the optimum band gap arrangement, but that the degradation in efficiency due to the band width up to -200 meV is moderate. It is also found that the band width can determine which band gap combination gives the highest global limiting efficiency. Further to the intermediate band width modification, the inclusion of band tails, analogous to those present in amorphous materials is discussed in terms of realizing an intermediate band using quantum dot arrays. In this model the worst case scenario is assumed, that of low absorption, but maximum emissivity at the band tail edge of the intermediate band. Results show that, with multiple band gap combinations giving several local peaks, the one giving the global maximum efficiency changes with band width. When band tails are included in a materials system proposed for implementing an intermediate band solar cell via quantum dot miniband formation significant drop off in efficiency is seen. The results taken together suggest the intermediate band width and any band tails should be considered in designs for intermediate band solar cells.

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“…The effects of QDs formed from different materials and sizes on the quantum mechanical properties of structures formed from those QDs have been extensively studied, as have systems of multiple similar QDs (Dolde et al, 2013;Burkard et al, 1999). The effect of random variations in size and spacing of QDs has also been studied (Mahler and Wawer, 1998;Gomez et al, 2002;Nozik et al, 2010). These studies demonstrated the existence of quantum mechanical effects in random/non-regimented QD arrays that are observed more prominently in regimented QD arrays but which are still present at functional levels in such disordered arrays.…”

Section: Qd Electron Conductance Band Formationmentioning

confidence: 99%

Coordination Mechanism in Dopamine Neurons of the <em>Substantia Nigra Pars Compacta</em> and Norepinephrine Neurons of the <em>Locus Coeruleus</em>

Rourk¹

2018

Preprint

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In this review, the author shows that ferritin has documented quantum dot material properties that have been reported in numerous independent studies and can generate coherent electron conduction bands over substantial distances, using quantum coherence. In addition, neuromelanin is a conjugated polymer, and quantum dot/conjugated polymer combinations have been reported in numerous independent studies to generate coherent electron conduction bands for solar photovoltaic applications. Both ferritin and neuromelanin are present in large quantities in the dopamine neurons of the substantia nigra pars compacta and the norepinephrine neurons of the locus coeruleus. The unique structure of subgroups of these neurons that have a large number of axon branches and synapses appears to have evolved to take advantage of these coherent electron conduction bands to coordinate conscious action. Independent clinical and laboratory studies are also reviewed that corroborate this theory of coordinated action in these neuron groups.  Proposed research to validate the theory using an existing fluorescent probe material is proposed.

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Transport in random quantum dot superlattices

Cited by 23 publications

References 11 publications

Mechanism for thermoelectric figure-of-merit enhancement in regimented quantum dot superlattices

Mechanism for thermoelectric figure-of-merit enhancement in regimented quantum dot superlattices

Intermediate band solar cell with non-ideal band structure under AM1.5 spectrum

Coordination Mechanism in Dopamine Neurons of the <em>Substantia Nigra Pars Compacta</em> and Norepinephrine Neurons of the <em>Locus Coeruleus</em>

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