Ll15 LeRer Formation of Si(phthalocyaninato)(OH) 2 and [Si(phthalocyaninato)O]~ films and their optical and electrical properties M. YUDASAKA Department of Materials Chemistry, Faculty of Engineering, Yokohama National University, Yokohama (Japan) M. KAWAI The Institute of Physical and Chemical Research, Wako Saitama (Japan) S. KURITAAND K. NAKANISHI Department of Materials Chemistry, Faculty of Engineering, Yokohama National University, Yokohama (Japan) Y. KUWAE Canon Incorporation, Atsugi Kanagawa (Japan) (Received February27, 1987;accepted May8, 1987) Films of Si(Pc)(OH) 2 (where Pc stands for phthalocyaninato) and [Si(Pc)O]n were formed selectively by evaporating Si(Pc)(OH)2 and varying the substrate temperature T~. Si(Pc)(OH)2 films formed at T~ < 200°C and [Si(Pc)O]n films formed at T~ > 240 °C. The absorption spectra and action spectra of the photocurrent for Si(Pc)(OH)2 films in the visible and near-IR regions show marked dependences on T~ owing to differences in the degrees of crystallization and orientation and in the intermolecular interaction of hydrogen bonds through --OH groups. The photoconductivity of I-Si(Pc)O], films is much less than that of Si(Pc)(OH)2 films. [Si(Pc)O]n is known as a cofaciallyjoined metallomacrocylic polymer made by the dehydration-condensation of Si(Pc)(OH) 2 (ref. 1). Because of its thermal and chemical stabilities and electrical properties t-5, [Si(Pc)O]~ has been expected to be a favourable organic material for electrical conductors. Si(Pc)(OH)2 is considered to be a hopeful material for photoelectric devices which are sensitive in the near-IR wavelength region 6, although the thermal stability of Si(Pc)(OH)2 is worse than that of [Si(Pc)O]~. The possibility of utilizing these compounds in electronic devices has been enhanced since the preparation of thin films of [Si(Pc)O]~ and Si(Pc)(OH)2 has been demonstrated. One of us (Y.K.) has pointed out that a thin film of [Si(Pc)O]n is formed by heating a film of the monomer Si(Pc)(OH)2 (ref. 7). Kobayashi et al. a prepared epitaxial films of some phthalocyanine monomers and polymers including Si(Pc)(OH)2 and [Si(Pc)O]. and characterized the structures of these filmsa. In this study we investigate the substrate temperature T~ dependence of the properties of films obtained by the evaporation of Si(Pc)(OH)2. It is found that 0040-6090/87/$3.50 © Elsevier Sequoia/Printed in The Netherlands