2022
DOI: 10.1039/d2nr02647c
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π-Orbital mediated charge transfer channels in a monolayer Gr–NiPc heterointerface unveiled by soft X-ray electron spectroscopies and DFT calculations

Abstract: With the aim to identify charge transfer channels underlying devices development and operation, X-Ray Photoelectron Spectroscopy (XPS), Near-Edge X-Ray Absorption Fine Structure (NEXAFS), and Resonant Photoelectron Spectroscopy (ResPES) have been...

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Cited by 6 publications
(9 citation statements)
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“…In contrast, the (DR/R 0 ) pos value is zero in the 0-1 ppm range and beyond this range increases with concentration, suggesting that at rst the p-type contribution is negligible, then in the 1-10 ppm range this behaviour is comparable with the n-type one, since the absolute value of the response is the same; nally, starting from 10 ppm concentration, the p-type response is dominant. The sensing mechanism suggested for the Gr_CoPc layer is likely to occur also for the other samples, although the switch from negative to positive DR/R 0 is not observed, as NiPc, FePc, and ZnPc are recognized as p-type compounds, [86][87][88] thereby displaying a behavior similar to that presented by p-type pristine graphene layers in air (Fig. 3c).…”
Section: Resultsmentioning
confidence: 85%
See 1 more Smart Citation
“…In contrast, the (DR/R 0 ) pos value is zero in the 0-1 ppm range and beyond this range increases with concentration, suggesting that at rst the p-type contribution is negligible, then in the 1-10 ppm range this behaviour is comparable with the n-type one, since the absolute value of the response is the same; nally, starting from 10 ppm concentration, the p-type response is dominant. The sensing mechanism suggested for the Gr_CoPc layer is likely to occur also for the other samples, although the switch from negative to positive DR/R 0 is not observed, as NiPc, FePc, and ZnPc are recognized as p-type compounds, [86][87][88] thereby displaying a behavior similar to that presented by p-type pristine graphene layers in air (Fig. 3c).…”
Section: Resultsmentioning
confidence: 85%
“…The sensing mechanism suggested for the Gr_CoPc layer is likely to occur also for the other samples, although the switch from negative to positive Δ R / R 0 is not observed, as NiPc, FePc, and ZnPc are recognized as p-type compounds, 86–88 thereby displaying a behavior similar to that presented by p-type pristine graphene layers in air ( Fig. 3c ).…”
Section: Resultsmentioning
confidence: 88%
“…For example, the coupling between nickel phthalocyanine (NiPc) and graphene is supported by the flat geometry of the NiPc complexes. 17 Especially for anisotropic organic semiconductor films, the orientation of the individual molecules at the heterostructure is of particular significance, since it influences the electronic properties of the film and, therefore the overall interaction at the interface. 18,19 We study the molecular orientation of cobalt phthalocyanine (CoPc) and perfluorinated cobalt phthalocyanine (CoPcF 16 ) on MoS 2 bulk crystals and on exfoliated pieces, often called flakes, which have fewer and even monolayer thickness�a system, where weak interactions at interfaces (i.e., the absence of an integer charge transfer) can be expected.…”
Section: Introductionmentioning
confidence: 99%
“…The nature of such interactions is currently being increasingly discussed, and one crucial parameter in this regard is the orientation of the molecules with respect to the substrate surface. For example, the coupling between nickel phthalocyanine (NiPc) and graphene is supported by the flat geometry of the NiPc complexes . Especially for anisotropic organic semiconductor films, the orientation of the individual molecules at the heterostructure is of particular significance, since it influences the electronic properties of the film and, therefore the overall interaction at the interface. , …”
Section: Introductionmentioning
confidence: 99%
“…42−44 Although this CoPc−Gr system is virtually unexplored in terms of time-resolved dynamics, a recent study revealed a chargetransfer process mediated by π orbitals occurring within a few femtoseconds in an analogous NiPc−Gr interface. 45 In this work, we characterized the ultrafast dynamics of both pristine and CoPc-functionalized Gr samples. The incoherent relaxation of these systems can be separated into short (≈10 fs) and long (>1 ps) components; however, only in the case of the CoPc−Gr architecture we observe an oscillating pattern resulting from the donor molecular vibrations, which are confirmed to play a crucial role in the electron transfer process.…”
Section: Introductionmentioning
confidence: 99%