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

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Abstract

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. © 2013 AIP Publishing LLC.

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Tabata, K., Sasaki, T., & Yamamoto, Y. (2013). Magnetic-field-induced enhancement of crystallinity and field-effect mobilities in phthalocyanine thin films. Applied Physics Letters, 103(4). https://doi.org/10.1063/1.4816244

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