High electron mobility in bathophenanthroline

Abstract

We have measured electron mobility in vacuum-deposited films of 4,7-diphenyl-1,10phenanthroline (bathophenanthroline, or BPhen) using a time-of-flight technique. Electron transport was highly dispersive for BPhen with a dispersion parameter of a value 0.30. The electron mobility in excess of ${10}^{\text{−4}} {\mathrm{cm}}^{\mathrm{2}}\mathrm{/V s}$ has been observed at electric fields of the order of ${10}^5 \mathrm{V/cm}$ with weakly dependent on the electric field. The characteristic energy of the distribution is obtained a value 0.09 eV. It is directly confirmed that the BPhen has superior electron-transport capability.