Relative permittivity and Hubbard U of pentacene extracted from scanning tunneling microscopy studies of p-doped films

►Tetrafluoro-tetracyanoquinodimethane effectively p-dopes pentacene. ►Donated holes are localized by ionized acceptor molecules. ►STM images of localized holes can be modeled by Coulomb potential. ►Fitting line profiles of localized holes to Coulomb potential yields ϵ, Hubbard U.