摘要
Flexible and broadband photodetectors have drawn extensive attention due to their potential application in foldable displays, optical communications, environmental monitoring, etc. In this work, a flexible photodetector based on the crystalline PbS quantum dots(QDs)/ZnO nanoparticles(NPs) heterostructure was proposed. The photodetector exhibits a broadband response from ultraviolet-visible(UV-Vis)to near infrared detector(NIR) range with a remarkable current on/off ratio of 7.08×10^3under 375 nm light illumination.Compared with pure ZnO NPs, the heterostructure photodetector shows the three orders of magnitude higher responsivity in Vis and NIR range, and maintains its performance in the UV range simultaneously. The photodetector demonstrates a high responsivity and detectivity of4.54 A W-1and 3.98×10^12Jones. In addition, the flexible photodetectors exhibit excellent durability and stability even after hundreds of times bending. This work paves a promising way for constructing next-generation high-performance flexible and broadband optoelectronic devices.
柔性和宽波段的光电探测器在可折叠显示、光通信和环境监测等方面有潜在的应用,因而引起广泛的关注.本文基于硫化铅量子点和氧化锌纳米颗粒异质结制备了柔性光电探测器.该器件表现出从紫外光到近红外光的宽波段光电响应性能.在375nm紫外光照射下,该器件的电流开关比高达7.08×10~3.与单纯的氧化锌纳米颗粒器件相比,基于异质结的光电探测器的响应度在可见光和近红外光区间增加了三个数量级,同时维持了器件在紫外光范围内的性能不变.同时,基于异质结的器件的响应度和探测率高达4.54 AW^(-1)和3.98×10^(12)Jones.此外,所研制的柔性光电探测器在经过数百次的折叠后,仍表现出了良好的机械和电学稳定性.本工作为下一代柔性和宽波段光电子器件的研究做了一个初步探索.
基金
funded by the National Natural Science Foundation of China (U1432249)
the National Key R&D Program of China (2017YFA0205002)
the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
supported by Collaborative Innovation Center of Suzhou Nano Science & Technology and Joint International Research Laboratory of Carbon-Based Functional Materials and Devices
the support from China Postdoctoral Science Foundation (2017M610346)
Natural Science Foundation of Jiangsu Province of China (BK20170343)
