Ambipolar carrier transport properties and molecular packing structure of octahexyl-substituted copper phthalocyanine

• Published in: Japanese Journal of Applied Physics Vol. 57; no. 4S; p. 4
• Main Authors: Watanabe, Ken, Watanabe, Koichi, Tohnai, Norimitsu, Itani, Hiromichi, Shimizu, Yo, Fujii, Akihiko, Ozaki, Masanori
• Format: Journal Article
• Language: English
• Published: Tokyo The Japan Society of Applied Physics 01-04-2018; Japanese Journal of Applied Physics
• Subjects: Carrier mobility; Carrier transport; Coordination compounds; Copper; Copper compounds; Crystal structure; Current carriers; Homology; Molecular chains; Molecular structure; Semiconductor materials; Single crystals; Steric hindrance; Structural analysis
• ISSN: 0021-4922; 1347-4065
• DOI: 10.7567/JJAP.57.04FL01

The charge carrier mobility of a solution-processable low-molecular-weight organic semiconductor material, i.e., 1,4,8,11,15,18,22,25-octahexylphthalocyanine copper complex (C6PcCu), was investigated by the time-of-flight technique. The anomalous ambipolar carrier mobility was discussed from the viewpoint of the molecular packing structure, which was clarified by single-crystal X-ray structure analysis. In the comparison between the molecular packing structures of C6PcCu and its metal-free-type homologue, it was found that the difference in carrier mobility originates from the rotation of the molecule, which is caused by the steric hindrance due to the introduction of a center metal and the interpenetration of the nonperipheral alkyl chains.