Ml. Anderson et al., RHEED AND OPTICAL CHARACTERIZATION OF ORDERED MULTILAYERS OF PHTHALOCYANINE C60 AND PHTHALOCYANINE PERYLENE-TETRACARBOXYLICDIANHYDRIDE (PTCDA), Surface science, 309, 1994, pp. 551-558
Ordered monolayers --> multilayers of trivalent metal phthalocyanines,
C60, and the perylenetetracarboxylic dianhYdride (PTCDA) have been fo
rmed by molecular beam epitaxy processes on both single crystal MoS2 a
nd SnS2, and on MBE-deposited SnS2 thin films. The bulk packing struct
ures for the trivalent metal chloride phthalocyanines lend themselves
to layered growth during deposition, as do the structures for C60 and
PTCDA. RHEED data collected during the formation of [(InPc-Cl)1-4 ML/(
C60)1-4 ML]1-20/SnS2/mica multilayers suggests that the structures obs
erved during the formation of single component thin films can be susta
ined during multilayer formation up to several lattice periods. Absorb
ance spectra of Pc/C60 and Pc/PTCDA multilayers show Pc Q-bands with m
axima and full widths consistent with the formation of ordered Pc laye
rs, provided that the Pc layer thickness is kept at 1-2 monolayers thr
oughout the formation of the multilayer assembly.