Electronic functionality of Gd-bisphthalocyanine: Charge carrier concentration, charge mobility, and influence of local magnetic field

• Published in: Synthetic metals Vol. 236; pp. 68 - 78
• Main Authors: Kratochvílová, I., Šebera, J., Paruzel, B., Pfleger, J., Toman, P., Marešová, E., Havlová, Š., Hubík, P., Buryi, M., Vrňata, M., Słota, R., Zakrzyk, M., Lančok, J., Novotný, M.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.02.2018; Elsevier BV
• Subjects: Carrier density; Carrier mobility; Carrier transport; Charge materials; Charge mobility; Charge transport; Current carriers; Electron paramagnetic resonance; Energy gap; Gadolinium; Gadolinium bisphthalocyanine electronic functionality; Influence of local magnetic field on charge carrier transport; Infrared spectroscopy; Insulators; Interaction of the mobile charge carriers with the local magnetic field of GdPc2; Ionization potentials; Magnetic fields; Magnetic properties; Magnetism; Molecular chains; Optoelectronics; Organic chemistry; Photonic band gaps; Photovoltaic cells; Physical properties; Solar cells; Gadolinium bisphthalocyanine electronic functionality; Charge mobility; Influence of local magnetic field on charge carrier transport; Interaction of the mobile charge carriers with the local magnetic field of GdPc2
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2018.01.007

[Display omitted] •Specific parameters affecting GdPc2 electrical conductivity were experimentally and theoretically studied.•Molecular arrangement and intermolecular and intramolecular charge carrier pathways were highlighted.•Narrow band gap together with small ionization potential of GdPc2 lead to high free charge carrier concentration.•Interaction of the mobile charge carriers with the local magnetic field of GdPc2 molecules reduces charge carrier mobility. Gadolinium bisphthalocyanine (GdPc2) has been placed among the highest ranked molecular materials considered namely for modern optoelectronic applications including organic solar cells. To improve understanding of the correlation between GdPc2 magnetic properties and its electronic functionality, we experimentally and theoretically studied charge carrier concentration, charge mobility, and influence of local magnetic field on charge carrier transport. For better clearance, all the main studied properties of GdPc2 bisphthalocyanine were compared with Zn phthalocyanine (ZnPc) as a reference material. Conductivity and charge carrier mobility were measured in materials incorporated in FET active channels. UV Vis spectroscopy, Electron Paramagnetic Resonance Spectroscopy, and IR spectroscopy were also applied. The narrow band gap together with small ionization potential of GdPc2 lead to high free charge carrier concentration. Among parameters affecting charge carrier mobility, molecular arrangement and intermolecular and intramolecular charge carrier pathways were highlighted. The possibility that the interaction of the mobile charge carriers with the local magnetic field of GdPc2 molecules reduces charge carrier mobility is also discussed.