Organic phototransistors based on perylene diimide nanocrystals lacking π-π Interactions

Ilya Bronshtein, Mark A. Iron, Boris Rybtchinski

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)10597-10602
Number of pages6
JournalJournal of Materials Chemistry C
Volume6
Issue number39
DOIs
Publication statusPublished - Jan 1 2018

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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