Charge-induced distortion and stabilization of surface transfer doped porphyrin films

Abstract

The interaction between zinc-tetraphenylporphyrin (ZnTPP) and fullerenes (C 60 and C 60 F 48 ) are studied using ultraviolet photoelectron spectroscopy (UPS) and scanning tunneling microscopy (STM). Low temperature STM reveals highly ordered ZnTPP monolayers on Au(111). In contrast to C 60 , a submonolayer coverage of C 60 F 48 results in long-range disorder of the underlying single ZnTPP layer and distortion of individual ZnTPP molecules. This is induced by substantial charge transfer at the organic-organic interface, revealed by the interface energetics from UPS. However, a second layer of ZnTPP prevents C 60 F 48 guests from breaking the self-assembled porphyrin template. This finding is important for understanding the growth behaviour of "bottom-up" functional nanostructures involving strong donor-acceptor heterojunctions in molecular electronics. © 2013 AIP Publishing LLC. [http://dx

Surface chemistry of porphyrins and phthalocyanines

“…For SnPc/PTCDA/Ag (1 1 1), formation of a stable SnPc layer was reported, which undergoes only weak physisorptive interaction with the underlying PTCDA layer [616]. For C 60 F 48 / ZnTPP/Au(1 1 1), but not for C 60 /ZnTPP/Au (1 1 1), strong integer charge transfer over the organic/organic interface was observed, causing structural disorder and molecular distorsion [632]. (Note that similar studies have been performed for interfaces between multilayers, for example for MnPc/CoPcF 16 , where an interfacial charge transfer from MnPc to CoPcF 16 was observed [633].…”

Liquid-solid surface phase transformation of fluorinated fullerene on monolayer tungsten diselenide

“…1a) using low-temperature (LT) scanning tunneling microscopy (STM) supported by first-principles calculations. C60F48 is selected as a model molecule because it is a molecular acceptor [32] with applications in lithium batteries [33,34], electronic devices [35][36][37] and so on [38,39]. WSe2 represents as a prototypical 2D-TMD semiconductor with a high photon quantum yield [30,31,40,41].…”

Filled and empty states of Zn-TPP films deposited on Fe(001)-p(1×1)O

“…The molecule–substrate interaction can be interpreted in terms of a bond between a special ligand (the surface) and the porphyrin (the so-called surface trans effect (STE)) [1,7]. In order to avoid this problem, porphyrin films are usually grown on passivated surfaces [1] or, conversely, thick (on the order of a few nanometers) films are exploited [8]. A possible alternative is the use of ultrathin metal oxide (MO) films [9].…”