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The Institute of Chemistry uses printing technology to manufacture three-dimensional photodetectors
[ Instrument R & D of Instrument Network ] The resonance effect of sub-wavelength-scale material structure and light is the basis for controlling light-matter interaction. Compared with the spatially symmetric structure, the difference between the resonance effect of the asymmetric structure and light at different incident angles is more obvious. This difference in resonance effects determines the strength of the material's absorption of light, so that it has the function of identifying the angle of light. The structure of the photodetector is designed to be a micro-nano structure that can differentiate and resonate with light, which can realize the detection of light angle, thereby broadening the function of the photodetector.
With the support of the National Natural Science Foundation of China, the Ministry of Science and Technology and the Chinese Academy of Sciences, researchers in the Key Laboratory of Green Printing of the Institute of Chemistry, Chinese Academy of Sciences have conducted systematic research on printing multi-dimensional, multi-functional devices in recent years. Recently, they manipulated the three-dimensional formation of droplets, printed and manufactured a vertical photodetector with an asymmetric resonance structure, realized the effective detection of spatial omnidirectional angle, and verified the new strategy of integrated structure and function printing manufacturing.
The photopolymer (PBDB-T: ITIC) solution was added dropwise to the prefabricated electrode template. Through the induction of the template and solvent volatilization, the same height as the electrode (20 microns) with a thickness of 200 nm was formed between the adjacent gold column electrodes. Facade array. The façade structure has a larger resonance cross section, which can increase the resonance difference caused by the light angle, thereby significantly improving the resolution of the light angle detection, and can realize the light detection of the difference of the incident angle of 10o. This strategy avoids the cumbersome process of traditional micro-machining methods, and realizes the integrated printing and manufacturing of structure and function for the first time. Each Au / PBDB-T: ITIC / Au structure in the array constitutes an independent facade-type photodetector unit. The light absorption intensity on the facade changes significantly with the angle of incident light.
They further designed the printed micro template into a "fork" structure. Analysis of the photocurrent data of the three facade detectors in the combination shows that this three-dimensional "fork" facade detector achieves effective detection of the omnidirectional angle in space. This work provides new methods and ideas for the design and preparation of three-dimensional micro-nano optoelectronic devices. The research results were published in the recently published "Advanced Materials" (Adv. Mater. 2020. DIO: 10.1002 / adma.201907280). The corresponding authors are researcher Song Yanlin and assistant researcher Su Meng.