Charge carrier transport through 3D assemblies of zincblende CdSe and ZnSe quantum dots in weak size-quantization regime

Pejova, Biljana; Bineva, I.

doi:10.1007/s10854-015-3006-3

Cited by 3 publications

(1 citation statement)

References 54 publications

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“…As the CZS‐APP content further increases to 1.2 vol%, the K of the nanocomposites gradually decrease to ≈15.5, due to the fact that the estimated interfiller distance (δ) decreases to ≈19.0 nm, [ 44 ] lower than the Debye Length of CZS nanodots ( L D , ≈21.8 nm). [ 45,46 ] This would increase the probability of local filler aggregation and also lead to the overlapped diffuse layers of two adjacent fillers with undesired electrostatic interactions according to the well‐established electric double layer model, [ 46,47 ] thus weakening the dielectric enhancement (Figure S10, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Significant Improvements in Dielectric Constant and Energy Density of Ferroelectric Polymer Nanocomposites Enabled by Ultralow Contents of Nanofillers

Cheng

et al. 2021

Advanced Materials

131

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Polymer dielectrics with excellent processability and high breakdown strength (Eb) enable the development of high‐energy‐density capacitors. Although the improvement of dielectric constant (K) of polymer dielectric has been realized by adding high‐K inorganic fillers with high contents (>10 vol%), this approach faces significant challenges in scalable film processing. Here, the incorporation of ultralow ratios (<1 vol%) of low‐K Cd1−xZnxSe1−ySy nanodots into a ferroelectric polymer is reported. The polymer composites exhibit substantial and concurrent increase in both K and Eb, yielding a discharged energy density of 26.0 J cm−3, outperforming the current dielectric polymers and nanocomposites measured at ≤600 MV m−1. The observed unconventional dielectric enhancement is attributed to the structural changes induced by the nanodot fillers, including transformation of polymer chain conformation and induced interfacial dipoles, which have been confirmed by density function theory calculations. The dielectric model established in this work addresses the limitations of the current volume‐average models on the polymer composites with low filler contents and gives excellent agreement to the experimental results. This work provides a new experimental route to scalable high‐energy‐density polymer dielectrics and also advances the fundamental understanding of the dielectric behavior of polymer nanocomposites at atomistic scales.

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Section: Resultsmentioning

confidence: 99%