Field assisted thermionic emission in polycrystalline SnO2

C. MALGÙ, M. PONCE, G. MARTINELLI, C.ALDAO

Roma, Italia

Congreso; AISEM 2008 XIII; 2008

  Field assisted thermionic emission in polycrystalline SnO2   C. Malagù1, and G. Martinelli1 1University of Ferrara via Saragat 1-44100 Ferrara-Italy M.A. Ponce2 and C.M. Aldao2 2Institute of Materials Science and Technology (INTEMA) Universidad Nacional de Mar del Plata-CONICET, Juan B. Justo 4302, B7608FDQ Mar del Plata, Argentina   Abstract  A deep analysis of conductance in nanostructured SnO2 thick films has been performed. A model for field-assisted-thermionic barrier crossing is being proposed to explain the mechanism. The model has been applied to two sets of nanostructured thick-films with grains having two well distinct characteristic radii (R=10nm and R=30nm). In the first case the grain radius is shorter than the depletion region width, a limit at which overlapping of barriers takes place [1], and in the second case it is longer. In Fig. 1 the intergranular barrier is shown as a function of the coordinate inside the grain for an intermediate (20nm) case.