Electronic properties of the space charge layer of the copper phthalocyanine thin films

Photoemission yield spectroscopy investigations of the electronic properties of copper phtalocyanine thin films UHV annealed and exposed to oxygen

“…In our previous note [18] we presented the preliminary results on the electronic properties of copper phthalocyanine (CuPc) thin films annealed in UHV at 410 K. We determined, among others, the values of the work function cp and the ionization energy @ as 4.70 eV and 5.20 eV, respectively. Moreover, a wide filled electronic state band was observed, localized in the band gap below the Fermi level E,.…”

Ab Initio Modeling of Mixed-Dimensional Heterostructures: A Path Forward

“…This causes a reduction of the IP from 6.41 to 5.46 eV with respect to vapor phase, as well as an increase of the EA from 2.17 to 3.21 eV, symmetrically narrowing the fundamental gap from 4.24 to 2.25 eV [Figure a]. It is worth noting that PE measurements of H 2 Pc, CuPc, and ZnPc films, which all have comparable π-dominated frontier energy levels, suggest somewhat lower values for the IP (4.82–5.20 eV with an average of 5.07 eV ,− ). This discrepancy can be ascribed to two experimental factors.…”

“…This discrepancy can be ascribed to two experimental factors. The first is the common practice of defining the IP as the very onset of the PE spectrum, ,− which differs significantly from the maximum of the first peak, which our value corresponds to. The comparatively large difference between the onset and the maximum reflects increased peak broadening in the condensed phase, which depends on a myriad of parameters, as manifest in the broad range of reported experimental values in contrast to the narrow distribution of results for the vapor-phase IPs.…”