Ultrathin-Film Growth of para-Sexiphenyl (I): Submonolayer Thin-Film Growth as a Function of the Substrate Temperature

Abstract

The para-sexiphenyl (p-6P) monolayer film induces weak epitaxy growth (WEG) of disk-like organic semiconductors, and their charge mobilities are increased dramatically to the level of the corresponding single crystals [Wang et al., Adv. Mater. 2007, 19, 2168]. The growth behavior and morphology of p-6P monolayer film play decisive roles on WEG. Here, we investigated the growth behavior of p-6P submonolayer film as a function of the substrate temperature. Its growth exhibited two different mechanisms at high and low substrate temperature. At high substrate temperature (>60 degrees C), the mechanism of diffusion-limited aggregation controlled the growth of submonolayer thin film with fractal islands, whereas at low substrate temperature (< or =60 degrees C), the submonolayer thin film was composed of the compact islands. Its growth exhibited another growth mechanism in which the stable compact islands were formed by dissociation and reorganization of the metastable disordered film. The substrate temperature of about 180 degrees C may be optimal to fabricate high-quality p-6P monolayer film with large-size domains and low saturated island density of about 0.018 microm(-2).

Synthesis, Spectral Properties of Zinc Hexadecafluorophthalocyanine (ZnPcF₁₆) and Its Application in Organic Thin Film Transistors

“…5) Phthalocyanines (Pc) show a long standing record of interest in both basic research and applications referring to their photoelectrical properties. 6) Copper hexadeca uorophthalocyanine (CuPcF 16 ) is one of the few promising n-type candidates as air stable and high mobility semiconductor materials. 7) Synthesis and investigations of CuPcF 16 were described in reference literature.…”

“…6) Copper hexadeca uorophthalocyanine (CuPcF 16 ) is one of the few promising n-type candidates as air stable and high mobility semiconductor materials. 7) Synthesis and investigations of CuPcF 16 were described in reference literature. 8) To improve the performance of CuPcF 16 -based OTFTs, Yan et al 3) employed an organic heterojunction buffer layer to decrease the contact resistance of organic/metal.…”

“…7) Synthesis and investigations of CuPcF 16 were described in reference literature. 8) To improve the performance of CuPcF 16 -based OTFTs, Yan et al 3) employed an organic heterojunction buffer layer to decrease the contact resistance of organic/metal. The electron eld-effect mobility is exponentially enhanced from 4.2 × 10 −2 to 7.6 × 10 −2 cm 2 /V·s.…”

“…5,9) Although the synthesis of uorinated metal phthalocyanines has been reported, 8,10,11) the fundamental properties of hexadeca uorinated phthalocyanines have not been sufciently studied. 8) In this paper, zinc hexadeca uorophthalocyanine (ZnPcF 16 , shown in Fig. 1) was synthesized in a slightly modi ed procedure and its spectral properties were characterized.…”

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A stable n-type semiconductor material, ZnPcF 16 , was synthesized and characterized by infrared (IR), UV-vis and uorescence spectra. ZnPcF 16 showed a monomer characteristic in 1, 2-dichlorobenzene (DCB) while exhibited an aggregation property in tetrahydrofuran (THF) and dimethylformamide (DMF).

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