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Improved sensitivity of UV sensors in hierarchically structured arrays of network-loaded ZnO nanorods via optimization techniques

机译：通过优化技术提高了网络加载的ZnO纳米棒的分层结构阵列中紫外线传感器的灵敏度

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摘要

Hierarchical nanostructures have received much attention in recent years for their enhanced fundamental properties and potential applications in manifold areas. Herein, we report a simple and robust strategy for the fabrication of hierarchically nanostructured arrays of network-loaded ZnO nanorods (NRs) for use in UV photodetectors based on comprehensively optimized experimental conditions using the Taguchi approach. Specifically, the critical roles of the morphological and structural characteristics of ZnO NRs on the UV sensing properties are systematically evaluated. Results show that the specific deposition conditions of the secondary colloidal ZnO NRs onto the surface of the vertically grown ZnO NRs contribute to the formation of tightly organized networks over large areas, which act as favorable energy junction barriers, and thus play a significant role in enhancing the performance of the UV photodetector. Under optimal conditions, the sensitivity of the prepared UV sensors was improved to 8000, which has not been reported yet in the field of ZnO-based UV sensors with vertical networked nanostructures. Our comprehensive studies to optimize sensitivity, responsivity, and response/recovery times suggest a highly viable route for practical applications in photodetectors using this facile implementation of ZnO NRs.
机译：近年来，分层纳米结构因其增强的基本性能以及在多种领域中的潜在应用而备受关注。在本文中，我们报告了基于Taguchi方法的综合优化实验条件，制造用于紫外线光电探测器的网络负载ZnO纳米棒（NRs）的分层纳米结构阵列的简单而可靠的策略。具体而言，系统地评估了ZnO NRs的形态和结构特征对紫外线感测特性的关键作用。结果表明，次要胶体ZnO NRs在垂直生长的ZnO NRs表面上的特定沉积条件有助于在大面积上形成紧密组织的网络，这是有利的能量结势垒，因此在增强能量结壁方面起着重要作用。紫外线光电探测器的性能。在最佳条件下，所制备的紫外线传感器的灵敏度提高到8000，这在具有垂直网络纳米结构的基于ZnO的紫外线传感器领域尚无报道。我们对灵敏度，响应度和响应/恢复时间进行优化的综合研究表明，使用这种简便的ZnO NRs实现在光电探测器中实际应用的可行途径。

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