Photo-mediated Structural Modulation of Texturally GrownZnO Thin Film with Polymer-Assisted Deposition and Its Application for High-Performance UV Photodetectors
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In this study, we developed a straightforward method to enhance the photoelectrical performance of texturally grown zinc oxide (ZnO) film based ultraviolet (UV) photodetectors by introducing the post-treatment of deep-UV (DUV). The ZnO precursor solutions were synthesized by mixing polyethylenimine for polymer-assisted deposition method, followed by preparing the ZnO films on c-axis aligned Al2O3 substrates to enable a textural crystal growth. Subsequently, comprehensive characterizations were performed to reveal the role of DUV treatment on texturally grown ZnO films, and we found that DUV treatment enabled the promotion of oxygen vacancies and consequent lattice relaxation. Consequently, the photoconductor exhibited a significantly enhanced photoconductivity under UV illumination (365 nm). Despite a substantial enhancement of photocurrent, the response times were slightly extended, namely, the alleviation of trade-off between photocurrent and response time was realized.