Thin Film Formations of Charge Transfer Complexes with Metallic Properties by Vacuum Deposition Method
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THIN FILM FORMATIONS OF CHARGE TRANSFER COMPLEXES WITH METALLIC PROPERTIES BY VACUUM DEPOSITION METHOD M.YUDASAKA*, *Materials Hodogaya-ku, **Institute
K.HIRONAGA*, Chemistry,
H.YAMOCHI**, K.NAKANISHI* AND G.SAITO** Yokohama National University, 156 Tokiwadai,
Yokohama 240, Japan for Soild State Physics,
7-22-1
Roppongi,
Minato-ku,
Tokyo,
Japan
ABSTRACT Thin films of a charge transfer pentaiodide ( TTF 7 I 5 , TTF:I 0 . 1 1 evaporation of TTF and obtained when substrate
complex, hepta-(tetrathiafulvalene) were prepared by double source iodine. Crystalline films of TTF:I 0 . 7 1 were 0 temperatures were kept between O°C and 25 C.
Orientation alignment of the rate of iodine. By controlling rate of iodine, substrates. It properties.
highly showed
),
crystalline films were affected by the substrate temprature and the
oriented crystalline strong dichroism
supply supply
films were grown on mica and anisotropic electrical
INTRODUCTION In utilizing fine characters of organic materials, one of the most potential technics is thin film formation by vacuum deposition. Different from inorganic semiconductors such aa Si and GaAs, however, organic materials have a disadvantage in evaporation methods; not a few organic materials decompose by heating before evaporation or sublimation. Polymers and charge transfer (CT) complexes are its examples. Because both polymers and CT complexes have a variety of fine properties, it is a valuable challenge to make their thin films by multi-source evaporation of starting materials (components). The authors have already shown that films of two dimensional copper phthalocyanine polymer and anthracene :pyromellitic acid dianhydride (PMDA) CT complex were available by this method; double source evaporation of Cu and tetracyanobenzene in the former case and that of anthracene and films of TTF:I 0 . 7 1 iodine by controlling that highly
PMDA in the latter[1,2]. are formed by the double substrate temperature
oriented TTF:I
0
.71
films can
be
This study shows that thin source evaporation of TTF and and supply rate of iodine and grown on mica.
EXPERIMENTAL TTF was purchased from Aldrich Chem. coevaporated in a pyrex glass chamber shown evaporation is also shown in Fig.1I. Inner quartz; upper was for TTF and the lower detected temperature of the crucible. The two by the Nichrome wire winded around them. In
Co.. TTF and iodine were in Fig.1. A crucible for TTF two cylinders were made of was for thermocouple which quartz cylinders were heated the film formation, 1-2mg of
TTF was evaporated by rasing the temperature of the crucible up to 5O~7OeC. Iodine was stored in an iodine source made of pyrex glass tube with one end closed and with the other end open (nozzle, 0.2mm•). The
Mat. Res. Soc. Syrup. Proc. Vol. 173. ©1990 Materaial
Research Society
138
diffusion pump
iO.N2
trap
KOH
column
liq N,
cfIII
trap
crucible for evaporation
Fig.l
Schematic illustrations source evaporation.
of
equipments
vacuum bttle for
TTF
and
iodine
double
closed end was dipped in a
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