Abstract
We studied the influence of adsorbates on the space–charge-limited current (SCLC) inindividual ZnO nanowires through varying the bias voltage, laser illumination, and ambientpressure. In dark and air conditions, the free carriers were depleted by the surfaceadsorbates, and electrons injected from the electrode to the nanowire dominated theelectron transport properties. Under laser illumination, the current–voltage characteristicwas linear at low voltage and superlinear at high voltage, and the SCLC regime occurred athigh voltages due to the surface desorption. The time response of photoconductivity furtherrevealed the dynamic process of elimination of SCLC by desorption of oxygen molecules atthe ZnO nanowire surface.
Published Version
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