Dielectric properties of polar-phthalocyanine monolayer systems with repulsive dipole interaction

Photoelectron spectroscopy on the charge reorganization energy and small polaron binding energy of molecular film

“…OTiPc molecule has a permanent electric dipole perpendicular to the molecular plane (O ␦--Ti ␦+ direction, 2.16 Debye [38]) with oxygen atom being negatively charged. For the as-grown film, the HOMO band consists of three features denoted by A, B, and C, while a very sharp HOMO band A' is observed for the annealed film as observed in the CuPc/HOPG system [34,39,42]. Similar annealing effects are observed in other polar-Pc systems (ClAlPc, OVPc, and PbPc), which can be explained by the rearrangement of the molecules due to the diffusion/migration and reorientation of the molecules.…”

“…(ClAlPc [35], OTiPc [36][37][38][39], OVPc [40], and PbPc [36,41]). As an example, HeI UPS of the 0.2-nm-OTiPc/HOPG, the results of the asgrown film on the HOPG kept at room temperature (RT) and the film annealed at 430 K are compared in Fig.…”

Control of the dipole layer of polar organic molecules adsorbed on metal surfaces via different charge-transfer channels

“…12 Dependence of the ELA on the polar-molecule orientation and packing density has also been reported [13][14][15][16][17][18][19][20][21][22] , and connection to device applications has been demonstrated. [23][24][25] Hosokai et al, who compared the as-grown (AG) and annealed (AN) chlorogallium-phthalocyanine (ClGaPc) films grown on highly oriented pyrolytic graphite (HOPG), reported large band bending of the HOMO state for the AG films with a stacked bilayer structure, but this band bending could be suppressed in the AN films because of the formation of a uniform Cl-up configuration after the thermal treatment; 13 the substrate, HOPG, was however fairly inert in this case, and charge transfer at the organic/metal interface was expected to be minimal.…”

Configuration-specific electronic structure of strongly interacting interfaces: TiOPc on Cu(110)

“…4 and 7). Both the considerable dipole moment for TiOPc (3.7 D calculated in the gas phase), which persists in large measure following adsorption [53], and the efficiency of self-assembly in reorienting nearly all "O-down" molecules [ Fig. 4(b)] support molecular orientation as a key factor in the observed work function increase.…”