PDF(Pubmed)
Abstract：
Photosensors with versatile functionalities have emerged as a cornerstone for breakthroughs in the future optoelectronic systems across a wide range of applications. In particular, emerging photoelectrochemical (PEC)-type devices have recently attracted extensive interest in liquid-based biosensing applications due to their natural electrolyte-assisted operating characteristics. Herein, a PEC-type photosensor was carefully designed and constructed by employing gallium nitride (GaN) p-n homojunction semiconductor nanowires on silicon, with the p-GaN segment strategically doped and then decorated with cobalt-nickel oxide (CoNiOx). Essentially, the p-n homojunction configuration with facile p-doping engineering improves carrier separation efficiency and facilitates carrier transfer to the nanowire surface, while CoNiOx decoration further boosts PEC reaction activity and carrier dynamics at the nanowire/electrolyte interface. Consequently, the constructed photosensor achieves a high responsivity of 247.8 mA W-1 while simultaneously exhibiting excellent operating stability. Strikingly, based on the remarkable stability and high responsivity of the device, a glucose sensing system was established with a demonstration of glucose level determination in real human serum. This work offers a feasible and universal approach in the pursuit of high-performance bio-related sensing applications via a rational design of PEC devices in the form of nanostructured architecture with strategic doping engineering.
摘要：
具有多功能功能的光电传感器已经成为未来光电系统在各种应用中取得突破的基石。特别是,新兴的光电化学（PEC）型装置最近吸引了广泛的兴趣，在基于液体的生物传感应用，由于其天然的电解质辅助操作特性。在这里，通过在硅上使用氮化镓（GaN）p-n同质结半导体纳米线，精心设计和构造了PEC型光传感器，p-GaN段战略掺杂，然后用钴镍氧化物（CoNiOx）装饰。本质上,p-n同质结结构与容易的p-掺杂工程提高载流子分离效率，促进载流子转移到纳米线表面，而CoNiOx装饰进一步增强PEC反应活性和载体动力学在纳米线/电解质界面。因此,构造的光电传感器实现了247.8mAW-1的高响应度，同时具有出色的操作稳定性。引人注目的是，基于设备的显着稳定性和高响应性，建立了一个葡萄糖传感系统，演示了真实人血清中的葡萄糖水平测定。这项工作提供了一种可行和通用的方法，通过合理设计具有战略性掺杂工程的纳米结构体系结构形式的PEC器件，来追求高性能的生物相关传感应用。
