Surface functionalization of WSe₂ by F₁₆CoPc

Abstract

We have investigated the electronic properties of WSe2 surfaces covered by fluorinated cobalt phthalocyanine (F16CoPc) using photoemission spectroscopy. We show that a charge transfer occurs at this interface, which results in the creation of holes in the WSe2 surface while the Co center of the phthalocyanine is reduced to Co(I). We observe a potential change in WSe2 approaching the surface as a consequence of the induced positive charges near the surface. In addition, our data allow for a rough estimation of the induced charge density and suggest that the holes might be localized.

Tuning the Interfacial Electronic Structure of MoS2 by Adsorption of Cobalt Phthalocyanine Derivatives

“…For example, for silicon, the Si 2p binding energy of heavily n-doped silicon is found at higher values compared to heavily p-doped silicon . These findings fit well with other previous investigations of doping in different heterostructured TMDCs. ,,, …”

“…43 These findings fit well with other previous investigations of doping in different heterostructured TMDCs. 9,10,14,25 To gain a deeper understanding of the origin of this doping, we map the band structure obtained by angle-resolved photoelectron spectroscopy (ARPES) in Figure 2. Figure 2a,b displays the energy dispersion diagrams for freshly cleaved MoS 2 , while Figure 2c,d depicts the diagrams after deposition of monolayers (0.34 nm) of CoPc and CoPcF 16 , respectively.…”

“…By constructing such weakly interacting TMDC/TPc heterostructures, the photoresponsivity and response time in phototransistors were improved compared to the pure TMDC components. − Furthermore, TPcs could be used for defect engineering and the resulting enhancement of photoluminescence quantum yields. − In this work, we seek to modify the type and concentration of charge carriers in n-type MoS 2 by the adsorption of cobalt phthalocyanine (CoPc) and its perfluorinated derivative (CoPcF 16 ). While the interface between TMDCs and other TPcs has been explored previously, the detailed electronic structure in interfaces between cobalt phthalocyanine derivatives and MoS 2 has not been studied so far . Moreover, this work contributes to the understanding of charge transfer processes and interface states in general, which is still under investigation. − …”

“…22−24 In this work, we seek to modify the type and concentration of charge carriers in n-type MoS the adsorption of cobalt phthalocyanine (CoPc) and its perfluorinated derivative (CoPcF 16 ). While the interface between TMDCs and other TPcs has been explored previously, 25 the detailed electronic structure in interfaces between cobalt phthalocyanine derivatives and MoS 2 has not been studied so far. 26 Moreover, this work contributes to the understanding of charge transfer processes and interface states in general, which is still under investigation.…”

Charge transfer at the α−RuCl3 /MnPc interface

“…On the other hand, electronic devices made out of polymers and organic molecules are on the rise with organic LED (OLED) screens in a wide range of commercial products and more exotic devices being the subject of research in both academia and industry [17,18]. Interfaces of two-dimensional (2D) inorganic with organic compounds are rarely studied, even though both research fields aim towards cost effective and high performance devices [19] and combining 2D materials such as WSe 2 with organic acceptor molecules leads to p-type doping at the interface [20]. The family of metal phtalocyanines (MPcs) features favorable electronic and optical properties as well as chemical stability and therefore has been considered for many technological applications such as molecular photovoltaics [21].…”