Transport of Low-Energy Electrons in Thin Organic Films

The different tools for the electron transport studies in ordered and disordered organic systems under the transmission of the electric current and the electron beam are considered. The observed features in both cases (transmission coefficient dependence on the sample thickness, temperature behaviour, elastic and inelastic transport, anisotropy, charging, luminescent properties) are similar confirming a similar nature of the electron transfer processes. The most promising approach to develop the common model describing electron transport in the metal-organics-metal structures has to contain two terms (i) the term concerning injection current including barrier and spectrum of emitting electrons at applied voltage and (ii) the scattering cross section (total or/and differential) as a function of electron energy, scattering angle and temperature. The usage of the electron impact spectroscopy methods possessing to measure much more characteristics than electric current transmission, gives the possibility to study practically all the variety of proceeding phenomena rather clearly, and to help invaluably for the interpretation of electric current transmission data.