Photodetection Performance of Hydrothermally Grown n-ZnO Nanorods at High Illumination Intensity
DOI:
https://doi.org/10.29329/jaasci.2023.562.04Keywords:
Hydrothermal, Photodetector, Photoresponse, Solar light, ZnO NanorodAbstract
An ultraviolet photodetector based on hydrothermally grown ZnO nanorods (NRs) on a ZnO thin film sandwich structure is reported here. A thin film of ZnO is deposited on a p-Si(100) substrate by means of RF sputter. ZnO NRs are prepared by the hydrothermal method on n-ZnO/p-Si at a molarity (10 mM) and growth times (2 and 3 h) at 90 oC. The surface texture is also investigated by scanning electron microscopy. The diameters of the ZnO-NRs are found to be in the range of 36 nm to 63 nm. Current versus time (I(t)) measurements are performed under the high illumination intensities (50 and 100 mW/cm2) and the bias voltages (1, 5, and 10 V). The parameters responsivity (R), sensitivity (S), decay time (τd), and rise time (τr), are calculated. Despite the slow τd and τr, the samples prepared at 2 h in 10 mM solution perform best due to their high S and R. In particular, the S for the Z2 varies between 0.12 and 1.93, while for the Z3 it varies between 0.10 and 0.94. The R is 1.36 AW-1 for the Z2, and 0.69 AW-1 for the Z3.
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