S. Wakabayashi et al., SCANNING TUNNELING MICROSCOPY SPECTROSCOPY STUDIES OF CONDUCTING POLYMER POLYPYRROLE/, Journal of applied physics, 76(9), 1994, pp. 5595-5597
Ultrahigh-vacuum scanning tunneling spectroscopy and tunneling spectro
scopy measurements of polypyrrole-vacuum-metal and polypyrrole-vacuum-
polypyrrole tunneling junctions indicates the existence of three chara
cteristic energy levels, 0.60, -0.40, and -0.65 eV near the Fermi leve
l of an as-grown polypyrrole films. The measured energy levels of -0.4
0 and -0.65 eV could be attributed to localized filled states and mobi
lity edge, respectively.