Abstract
The low frequency noise of metal-semiconductor field-effect transistors (MESFETs) based on ZnO:Mg thin films grown by pulsed laser deposition on a-plane sapphire was investigated. In order to distinguish between noise generation in the bulk channel material, at the semiconductor surface, and at the gate/channel interface, ohmic ZnO channels without gate were investigated in detail, especially concerning the dependency of the noise on geometrical variations. The experiments suggest that the dominating 1/f noise in the frequency range below 1 kHz is generated within the bulk channel material, both for bare ZnO channels and MESFETs.
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