Charge Transport in Thin‐Film Transistors Based on Liquid‐Crystalline Phthalocyanines
Abstract
We investigate a series of liquid‐crystalline phthalocyanines (metal‐free and Cu, Zn, Ni, Co complexes) and their electronic performance as active layers in organic thin‐film transistors (OTFTs). Raman spectroscopy reveals metal‐dependent distortions of the phthalocyanine macrocycles, reflected in systematic shifts of the C−N−C and M−N vibrational modes. When integrated into OTFTs, all compounds exhibited markedly enhanced current response under ultrahigh vacuum compared to an N 2 ‐ atmosphere, demonstrating that intrinsic charge transport is suppressed by atmospheric species. Temperature‐dependent measurements (in the 100–300 K range) revealed that the threshold‐voltage shifts in the devices were driven by deep interface and bulk traps, while all devices displayed thermally activated mobility with low activation energies (≈14–20 meV). These results highlight how mesomorphic order, metal coordination, and environmental conditions collectively govern charge transport in liquid‐crystalline phthalocyanines, offering design guidelines for their use as self‐assembled semiconducting materials in organic electronics. Our results therefore represent a systematic characterization of liquid‐crystalline phthalocyanine‐based OTFTs, revealing low trap‐barrier energies and efficient charge‐hopping pathways present in these materials.
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BibTeX
@article{junior2026charge,
title = {{Charge Transport in Thin‐Film Transistors Based on Liquid‐Crystalline Phthalocyanines}},
author = {Lindiomar Borges de Avila Junior and Zuchong Yang and Ilknur Hatice Eryilmaz and Lilian Skokan and Leonardo Furini and Andreas Ruediger and Harald Bock and Ivan H Bechtold and Emanuele Orgiu},
journal = {ChemNanoMat},
year = {2026},
month = jun,
doi = {10.1002/cnma.70297},
eprint = {2601.03058},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05826993v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Charge Transport in Thin‐Film Transistors Based on Liquid‐Crystalline Phthalocyanines
AU - Lindiomar Borges de Avila Junior
AU - Zuchong Yang
AU - Ilknur Hatice Eryilmaz
AU - Lilian Skokan
AU - Leonardo Furini
AU - Andreas Ruediger
AU - Harald Bock
AU - Ivan H Bechtold
AU - Emanuele Orgiu
PY - 2026
DA - 2026/06/12
JO - ChemNanoMat
DO - 10.1002/cnma.70297
UR - https://hal.science/hal-05826993v1
AB - We investigate a series of liquid‐crystalline phthalocyanines (metal‐free and Cu, Zn, Ni, Co complexes) and their electronic performance as active layers in organic thin‐film transistors (OTFTs). Raman spectroscopy reveals metal‐dependent distortions of the phthalocyanine macrocycles, reflected in systematic shifts of the C−N−C and M−N vibrational modes. When integrated into OTFTs, all compounds exhibited markedly enhanced current response under ultrahigh vacuum compared to an N 2 ‐ atmosphere, demonstrating that intrinsic charge transport is suppressed by atmospheric species. Temperature‐dependent measurements (in the 100–300 K range) revealed that the threshold‐voltage shifts in the devices were driven by deep interface and bulk traps, while all devices displayed thermally activated mobility with low activation energies (≈14–20 meV). These results highlight how mesomorphic order, metal coordination, and environmental conditions collectively govern charge transport in liquid‐crystalline phthalocyanines, offering design guidelines for their use as self‐assembled semiconducting materials in organic electronics. Our results therefore represent a systematic characterization of liquid‐crystalline phthalocyanine‐based OTFTs, revealing low trap‐barrier energies and efficient charge‐hopping pathways present in these materials.
SN - 2199-692X
SN - 2199-692X
ER -