Scattering centres and their relation to the recombination centres in single crystals of CdSe

Sakalas, A.; Baubinas, R.

doi:10.1002/pssa.2210310135

Cited by 9 publications

(3 citation statements)

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“…Both Cu þ impurities and vacancies serve as mid-gap trap states and give rise to sub-bandgap luminescence [21][22][23][24] , which we employed for monitoring the doping of NCs at various stages in the cation exchange titration (Fig. 1b).…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless it still leaves open the question of the atomistic mechanism for co-operativity. In haemoglobin, oxygen binding at one of the heme subunits leads to a conformational change in the neighbouring subunits, which increases the affinity of the neighbour site for oxygen binding, a phenomenon known as allostery 22 . Allosteric coupling between lattice sites of a NC can originate from a few different structural factors.…”

Section: Discussionmentioning

confidence: 99%

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Co-operativity in a nanocrystalline solid-state transition

et al. 2013

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Co-operativity is a remarkable phenomenon mostly seen in biology, where initial reaction events significantly alter the propensity of subsequent reaction events, giving rise to a nonlinear tightly regulated synergistic response. Here we have found unique evidence of atomic level co-operativity in an inorganic material. A thousand-atom nanocrystal (NC) of the inorganic solid cadmium selenide exhibits strong positive co-operativity in its reaction with copper ions. A NC doped with a few copper impurities becomes highly prone to be doped even further, driving an abrupt transition of the entire NC to the copper selenide phase, as manifested by a strongly sigmoidal response in optical spectroscopy and electron diffraction measurements. The examples presented here suggest that cooperative phenomena may have an important role in the solid state, especially in the nucleation of new chemical phases, crystal growth, and other materials' transformations.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Co-operativity in a nanocrystalline solid-state transition

et al. 2013

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“…We have also used the reaction X ! I V i e -t V& + 2e(Kbl, s2) and V level (E + 0.95)eV (11) is presumably due to the doubly ionized Cd vacancies (12).…”

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confidence: 98%