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(a) Chemical structure of Ph2-IDPL (Ph: phenyl). (b) Molecular stacking in Ph2-IDPL crystal. Wavy lines indicate intermolecular interactions. (c) Simulated HOMO of Ph2-IDPL.
(a) XRD spectra of Ph2-IDPL films prepared under various conditions: bottom, film prepared in UHV; middle, film deposited at P N2 ≈ 0.1 kPa; top, film deposited at P N2 ≈ 0.5 kPa. A naturally oxidized Si(100) surface was used as the substrate for the bottom and middle spectra. HMDS/SiO2 was used as the substrate for the top spectrum. (b) UV-Vis-NIR absorption spectra of Ph2-IDPL films prepared by gas deposition on a quartz substrate. The number in the figure indicates P N2. (c) AFM image of Ph2-IDPL film prepared by the gas deposition (P N2 ≈ 0.5 kPa) on HMDS/SiO2 substrate. (d) Cross-sectional view of the dotted line in the AFM image in (c).
(a) UPS spectra of Ph2-IDPL films prepared in UHV (A) and in a dry nitrogen atmosphere (P N2 ≈ 0.1 kPa (B) and 0.5 kPa (C)) (bottom axis: binding energy with respect to E F). Simulated UPS spectra correspond to the solid line in (c). (b) Simulated UPS spectra of Ph2-IDPL monomer and its oligomers (N = 2–8). Bottom axis shows ionization energy with respect to vacuum level. Vertical lines are simulated molecular orbital energy levels. (c) Inset shows band structure (Γ-Y). Hatched spectra represent DOS. Solid lines represent simulated UPS spectrum from the DOS. The top axis shows binding energy with respect to E F.
Simulated HOMO and HOMO-7 of Ph2-IDPL oligomer (N = 8).
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