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The Fowler−Nordheim Plot Behavior and Mechanism of Field Electron Emission from ZnO Tetrapod Structures

2010; American Chemical Society; Volume: 4; Issue: 10 Linguagem: Inglês

10.1021/nn1008403

1936-086X

Ahmed A. Al‐Tabbakh, Mahendra A. More, Dilip S. Joag, I.S. Mulla, Vijayamohanan K. Pillai,

Semiconductor materials and interfaces

Field emission measurements of current−voltage characteristics are reported for tetrapod structures of ZnO. The nonlinear Fowler−Nordheim (FN) plot is analyzed according to a model of calculation based on saturation of conduction band current and predominance of valence band current at high-field values. The simulated FN plot exhibits similar features to those observed experimentally. The model of calculation suggests that the slope variation of the FN plot, in the high-field and low-field regions, does not depend on the magnitude of saturation. Instead, it is a characteristic of the energy band structure and voltage-to-barrier-field conversion factor of the emitting material.