Abstract
The nature of surface-charge layers is studied, with the help of AF electro-luminescence (EL), in single crystals of ferroelectric KNbO3. The variation of EL output with the applied potential and its frequency suggests that the crystal surface has a domain reversal charge layer. The origin and growth of EL pulses reveal a non-uniform charge density on these layers. The observation of reduction in EL output on irradiation suggests the presence of space-charge layers. It is proposed that the crystal has a complex type of surface-charge layer which is the result of the presence of a space-charge layer as well as the domain reversal charge layer. This will divide the layer into small zones, each having uniform charge density within itself, but different from surrounding zones. It is shown that the field across the layer is sufficient to cause field emission which gives rise to EL.
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