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All-inkjet-printed flexible ZnO micro photodetector for a wearable UV monitoring device

机译：全喷墨印刷柔性ZnO微光电探测器，可穿戴UV监控装置

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Fabrication of small-sized patterns of inorganic semiconductor onto flexible substrates is a major concern when manufacturing wearable devices for measuring either biometric or environmental parameters. In this study, micro-sized flexible ZnO UV photodetectors have been thoroughly prepared by a facile inkjet printing technology and followed with heat treatments. A simple ink recipe of zinc acetate precursor solution was investigated. It is found that the substrate temperature during zinc precursor ink depositing has significant effects on ZnO pattern shape, film morphology, and crystallization. The device fabricated from the additive manufacturing approach has good bendability, Ohmic contact, short response time as low as 0.3 s, and high on/off ratio of 3525. We observed the sensor's dependence of response/decay time by the illuminating UV light intensity. The whole process is based on additive manufacturing which has many benefits such as rapid prototyping, saving material, being environmentally friendly, and being capable of creating high-resolution patterns. In addition, this method can be applied to flexible substrates, which makes the device more applicable for applications requiring flexibility such as wearable devices. The proposed all-inkjet-printing approach for a micro-sized ZnO UV photodetector would significantly simplify the fabrication process of micro-sized inorganic semiconductor-based devices. A potential application is real-time monitoring of UV light exposure to warn users about unsafe direct sunlight to implement suitable avoidance solutions.
机译：在柔性基板上制造无机半导体的小型图案是制造用于测量生物识别或环境参数的可穿戴装置时的主要问题。在该研究中，通过容易的喷墨印刷技术彻底制备了微尺寸的柔性ZnO UV光电探测器，然后用热处理彻底制备。研究了一种简单的醋酸锌前体溶液的墨水配方。发现锌前体墨滴期间的衬底温度对ZnO图案形状，薄膜形态和结晶具有显着影响。从添加剂制造方法制造的装置具有良好的弯曲性，欧姆接触，短响应时间低至0.3秒，高开/关比为3525.我们观察到传感器对响应/衰减时间的依赖性通过照明UV光强度。整个过程基于添加剂制造，这些制造具有许多益处，例如快速的原型设计，节省材料，环境友好，并且能够产生高分辨率模式。另外，该方法可以应用于柔性基板，这使得该装置更适用于需要柔韧性的诸如可穿戴设备的应用。用于微尺寸ZnO紫外线光电探测器的所提出的全喷墨印刷方法将显着简化微尺寸无机半导体基装置的制造过程。潜在的应用是对UV灯曝光的实时监测，警告用户有关不安全的直接阳光来实现合适的避免解决方案。

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