Indirect coupling of an organic semiconductor to a d -orbital surface state
Abstract
Adsorption of the organic semiconductor perylene tetracarboxylic dianhydride onto Cr (001 ) decreases the metal d -derived surface-state lifetime without causing a shift in its energy. This suggests an indirect electronic interaction that contrasts sharply with expectations of p-d electronic coupling based on direct chemisorption. Lifetime changes are measured with scanning tunneling spectroscopy as a function of temperature and quantified as arising from a molecule-induced increase in electron-electron scattering rate into bulk bands within Fermi-liquid theory. Adsorbate-induced effects extend far beyond the adsorption site of the molecule, decaying exponentially away with a characteristic length scale of ∼2.4 nm , similar to the carrier mean free path in Cr.
- Publication:
-
Physical Review B
- Pub Date:
- October 2015
- DOI:
- 10.1103/PhysRevB.92.161401
- Bibcode:
- 2015PhRvB..92p1401W
- Keywords:
-
- 72.80.Le;
- 68.37.Ef;
- 72.25.Hg;
- 78.40.Me;
- Polymers;
- organic compounds;
- Scanning tunneling microscopy;
- Electrical injection of spin polarized carriers;
- Organic compounds and polymers