Organic thin film transistors using a liquid crystalline palladium phthalocyanine as active layer | Zendy

J. A. Jiménez-Tejada | Zendy; Pilar LopezVaro | Zendy; Nandu B. Chaure | Zendy; Isabelle Chambrier | Zendy; Andrew N. Cammidge | Zendy; Michael J. Cook | Zendy; Ali Jafari-Fini | Zendy; Asim K. Ray | Zendy

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Organic thin film transistors using a liquid crystalline palladium phthalocyanine as active layer

Author(s) -

J. A. Jiménez-Tejada,

Pilar LopezVaro,

Nandu B. Chaure,

Isabelle Chambrier,

Andrew N. Cammidge,

Michael J. Cook,

Ali Jafari-Fini,

Asim K. Ray

Publication year - 2018

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.5017472

Subject(s) - materials science , thin film transistor , active layer , transistor , annealing (glass) , optoelectronics , mesophase , phthalocyanine , dielectric , organic field effect transistor , threshold voltage , thin film , electron mobility , organic semiconductor , fabrication , silicon , layer (electronics) , field effect transistor , nanotechnology , voltage , composite material , electrical engineering , liquid crystal , medicine , alternative medicine , engineering , pathology

70 nm thick solution-processed films of a palladium phthalocyanine (PdPc6) derivative bearing eight hexyl (–C6H13) chains at non-peripheral positions have been employed as active layers in the fabrication of bottom-gate bottom-contact organic thin film transistors (OTFTs) deposited on highly doped p-type Si (110) substrates with SiO2 gate dielectric. The dependence of the transistor electrical performance upon the mesophase behavior of the PdPc6 films has been investigated by measuring the output and transfer characteristics of the OTFT having its active layer ex situ vacuum annealed at temperatures between 500 °C and 200 °C. A clear correlation between the annealing temperature and the threshold voltage and carrier mobility of the transistors, and the transition temperatures extracted from the differential scanning calorimetric curves for bulk materials has been established. This direct relation has been obtained by means of a compact electrical model in which the contact effects are taken into account. The precise determination of the contact-voltage drain-current curves allows for obtaining such a relation.70 nm thick solution-processed films of a palladium phthalocyanine (PdPc6) derivative bearing eight hexyl (–C6H13) chains at non-peripheral positions have been employed as active layers in the fabrication of bottom-gate bottom-contact organic thin film transistors (OTFTs) deposited on highly doped p-type Si (110) substrates with SiO2 gate dielectric. The dependence of the transistor electrical performance upon the mesophase behavior of the PdPc6 films has been investigated by measuring the output and transfer characteristics of the OTFT having its active layer ex situ vacuum annealed at temperatures between 500 °C and 200 °C. A clear correlation between the annealing temperature and the threshold voltage and carrier mobility of the transistors, and the transition temperatures extracted from the differential scanning calorimetric curves for bulk materials has been established. This direct relation has been obtained by means of a compact electrical model in which the contact effects are taken into account. ...

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