Charge transport in liquid-crystalline phthalocyanine-based thin-film transistors
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arXiv
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2026
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| author | Avila, L. B. Yang, Zuchong Eryilmaz, Ilknur Hatice Skokan, Lilian Furini, Leonardo N Ruediger, Andreas Bock, H. Bechtold, I. H. Orgiu, E. |
| author_facet | Avila, L. B. Yang, Zuchong Eryilmaz, Ilknur Hatice Skokan, Lilian Furini, Leonardo N Ruediger, Andreas Bock, H. Bechtold, I. H. Orgiu, E. |
| contents | We investigate a series of liquid-crystalline phthalocyanines (metal-free and Cu, Zn, Ni, Co complexes) by correlating their vibrational signatures with their electronic performance in organic thin-film transistors (OTFTs). Raman spectroscopy reveals metal-dependent distortions of the phthalocyanine macrocycle, reflected in systematic shifts of the C-N-C and M-N vibrational modes. When integrated into OTFTs, all compounds exhibit markedly enhanced current response under ultrahigh vacuum compared to an N2-rich environment, demonstrating that intrinsic charge transport is strongly suppressed by atmospheric species. Temperature-dependent measurements (100-300 K) show clear threshold-voltage shifts driven by deep interface and bulk traps, while all devices display 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 orientable semiconducting materials in organic electronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_03058 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Charge transport in liquid-crystalline phthalocyanine-based thin-film transistors Avila, L. B. Yang, Zuchong Eryilmaz, Ilknur Hatice Skokan, Lilian Furini, Leonardo N Ruediger, Andreas Bock, H. Bechtold, I. H. Orgiu, E. Materials Science Applied Physics We investigate a series of liquid-crystalline phthalocyanines (metal-free and Cu, Zn, Ni, Co complexes) by correlating their vibrational signatures with their electronic performance in organic thin-film transistors (OTFTs). Raman spectroscopy reveals metal-dependent distortions of the phthalocyanine macrocycle, reflected in systematic shifts of the C-N-C and M-N vibrational modes. When integrated into OTFTs, all compounds exhibit markedly enhanced current response under ultrahigh vacuum compared to an N2-rich environment, demonstrating that intrinsic charge transport is strongly suppressed by atmospheric species. Temperature-dependent measurements (100-300 K) show clear threshold-voltage shifts driven by deep interface and bulk traps, while all devices display 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 orientable semiconducting materials in organic electronics. |
| title | Charge transport in liquid-crystalline phthalocyanine-based thin-film transistors |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2601.03058 |