Magnetic-field-induced enhancement of crystallinity and field-effect mobilities in phthalocyanine thin films | Zendy

Kenichi Tabata | Zendy; Takayuki Sasaki | Zendy; Yohei Yamamoto | Zendy

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Magnetic-field-induced enhancement of crystallinity and field-effect mobilities in phthalocyanine thin films

Author(s) -

Kenichi Tabata,

Takayuki Sasaki,

Yohei Yamamoto

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4816244

Subject(s) - crystallinity , materials science , phthalocyanine , diamagnetism , organic semiconductor , thin film , magnetic field , condensed matter physics , semiconductor , optoelectronics , composite material , nanotechnology , physics , quantum mechanics

Organic semiconductor thin films were fabricated by thermal deposition of free-base and metal phthalocyanines under a static magnetic field. A vertical magnetic field enhanced the crystallinity of the edge-on orientation of the phthalocyanine discs, whereas a horizontal magnetic field had a minimal effect on the crystallinity. The major factor for the orientation change is attributed to the diamagnetic anisotropies of π-electrons in the phthalocyanine macrocycles. Field-effect transistors of phthalocyanine films fabricated under a vertical magnetic field exhibited better hole mobilities and on-current values with smaller threshold voltages than those of phthalocyanine films fabricated without a magnetic field

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