THE EFFECT OF NITROGENATION ON THE ELECTRICAL-PROPERTIES OF AMORPHOUSHYDROGENATED CARBON LAYERS

The electrical properties of nitrogen-containing amorphous hydrogenate d carbon layers are investigated. The nitrogen concentration was betwe en 0 and 6 at%. The electrical conductivity is found to increase with the nitrogen content. The temperature dependent conductivity in the te mperature range between 150 and 350 K can be well fitted by a semi-emp irically derived equation which considers the conductivity as a superp osition of two hopping mechanisms with different activation energies. Together with experimental results on the optical properties and the m ass density, these data allowed to propose a structural model which ex plains the observed effects in terms of familiar a-C:H cluster models.