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With the rapid development of science and technology, people are constantly pursuing wearable electronic devices that are portable, entertaining, and healthy, prompting their corresponding flexible sensor devices to develop toward high-efficiency, low-cost, and large-area manufacturing. In recent years, in order to realize the portability and portability of photodetectors, the design and preparation of flexible photodetectors has received extensive attention from researchers. The rapid development of flexible optical exploration technology requires higher sensitivity and flexibility for sensitive materials. One-dimensional inorganic nanomaterials have a high aspect ratio and anisotropic characteristics. Its unique electronic confinement effect is conducive to the separation of electron and hole energy states, which can effectively extend the carrier lifetime and exhibit excellent photoelectric properties. At the same time, the linear geometry makes the external force very elastic, resulting in no cracks on the surface of the material after deformation. These characteristics make one-dimensional inorganic nanomaterials suitable for the design and preparation of micro-flexible optoelectronic devices.
Recently, the research group Shen Guozhen, a researcher at the State Key Laboratory of Superlattices, Institute of Semiconductors, Chinese Academy of Sciences, has made a series of progresses in the preparation of one-dimensional inorganic branched homo/hetero nanowires and flexible photodetection. Dr. Li Ludong et al. proposed the idea of ​​improving the detection sensitivity by constructing CdS branching homogenous nanowires, and successfully designed a CdS flexible visible light detector with ultra-high detection sensitivity, which can switch light and dark current under visible light irradiation. The ratio is as high as 1.96 × 104 and the specific detection rate is 4.27 × 1012 Jones, which is several orders of magnitude higher than the previously reported CdS nanowire photodetectors. Related work was published in ACS Applied Materials & Interfaces (2015, 7, 23507−23514). )on.
In order to further improve the photoelectric properties of the detector and broaden the spectral response of the device. The research group Dr. Yongzheng used a two-step method to grow a layer of CdS nanorods on the surface of ZnS nanowires to form ZnS/CdS branched heterogeneous nanowires. Due to the separation of electron-hole pairs at the interface, the response of ZnS/CdS-branched heterogeneous nanowires to the 350 nm UV light was significantly improved compared to that of the pure-phase ZnS nanowires, and the light-to-dark current switching ratio reached 105. The detection rate is 2.2 × 1014 Jones. At the same time, due to the introduction of CdS nanorods, the device also responds well to visible light. In addition, large-area ZnS/CdS branched heterogeneous nanowires photodetector devices have also been assembled onto flexible PET substrates, exhibiting excellent repeatability and stability. After being bent at different degrees and times, their performance It basically remains unchanged. Related work was published on the Nanoscale (2016, 8, 5219−5225).
In addition, the research team used superlattice nanowires with high carrier mobility, electronic transmission power modulation, and unique optical characteristics to produce a highly responsive InGaO3 (ZnO) superlattice nanowire flexible ultraviolet photodetector. . The related work was published in Advanced Electronic Materials (2015, 1, DOI: 10.1002/aelm.201500054) and was selected as the first edition of the journal. At the same time, the task group's work on multiple oxide ZnGaO3 single nanowire flexible UV detectors was also published in Nano Research (2015, 8, 2162-2169).
Based on the progress made by the research group in recent years in the field of flexible photodetection of one-dimensional inorganic nanomaterials, an invitation was invited by the editor of the Advanced Science of Germany's Wiley Publishing Company. Recently, the research group Shen Guozhen published a review article in this journal (2015, DOI: 10.1002/advs.201500287), summed up the major breakthroughs and advances made in the field of flexible photodetection in the past decade, and forecasted and analyzed the future research hotspots in this field. After the publication of the paper, a hot topic titled "Study of the Status of Flexible Photodetectors Based on One-dimensional Inorganic Nanomaterials" was published by Materials Views China website of Wiley.
This series of work was supported by projects supported by the National Natural Science Foundation of China (61377033, 6157413).
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