AbstractQuinizarin (1,4‐DHAQ) and Ag/I,4‐DHAQ thin films deposited under vacuum were investigated byI–Vmeasurements at various temperatures. It is shown that when submitted to an electric field of 5 × 105V cm−1or less, theI‐Vcharacteristics of AI/DHAQ/AI sandwich structures are ohmic. The temperature dependence isI∝ exp(‐ΔE/kT). The measured activation energy is 0.3 eV in the case of pure DHAQ and 30meV in the case of Ag/DHAQ. Therefore we can imagine that in the former case the conductivity is controlled by thermally activated hopping above intermolecular barriers, while in the latter case the conductivity can be attributed to tunnelling betwee