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Issue 39, 2018
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Organic phototransistors based on perylene diimide nanocrystals lacking π–π interactions

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Abstract

We report on the fabrication and characterization of organic phototransistors (OPTs) based on fluorescent nanocrystals assembled from a simple organic dye molecule (N,N′-bis(2,4-dimethylpent-3-yl)perylene-3,4:9,10-tetracarboxylic diimide, DMP-PDI). The OPT active layer is based on DMP-PDI nanocrystals assembled in aqueous solution or within polymer films. Despite the absence of any π-overlap, the nanocrystals show mobilities as high as (5 ± 1) × 10−3 cm2 V−1 s−1 in polymer films, which is due to imide/π-core noncovalent interactions leading to substantial electronic coupling as revealed by computational studies. The OPTs strongly respond to white light irradiation, resulting in a decrease in threshold voltage by as much as 40 V. OPTs based on nanocrystals assembled within polymer films have threshold voltages close to 0 V upon illumination and a high photo/dark current ratio (P = 4 × 103). We show that the organic crystals lacking π-overlap mediate charge mobility and are advantageous as active layers for OPTs due to diminished nonradiative decay.

Graphical abstract: Organic phototransistors based on perylene diimide nanocrystals lacking π–π interactions

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Publication details

The article was received on 14 Jun 2018, accepted on 10 Sep 2018 and first published on 11 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC02921K
Citation: J. Mater. Chem. C, 2018,6, 10597-10602
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    Organic phototransistors based on perylene diimide nanocrystals lacking π–π interactions

    I. Bronshtein, M. A. Iron and B. Rybtchinski, J. Mater. Chem. C, 2018, 6, 10597
    DOI: 10.1039/C8TC02921K

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