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안재용,( Xiaobo Shang ),송인호,( Hiroyoushi Ohtsu ),오준학 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Circularly polarized light (CPL) is of great significance to various photonic technologies, including optical communication, quantum computation, and 3D displays. Supramolecular chirality has the potential to be used as a useful way to emit or detect CPL due to its property of chirality amplification. Here, novel chiral perylene diimides are synthesized and self-assembled into single crystals using a solvent-diffusion method. Phototransistors based on an individual single crystal showed a high mobility of 0.25㎠ V<sup>-1</sup>s<sup>-1</sup>, a large photoresponsivity of 187 A W<sup>-1</sup>, and a detectivity of 1.3 ×10<sup>15</sup>. Furthermore, their optoelectronic performances were sharply increased after the devices were doped by saturated hydrazine vapor for 5 minutes. Finally, the doped crystals based phototransistor exhibited clear CPL detection with high dissymmetry factor around 0.12. These results pave the way for the miniature and integrated CPL detectors via self-assembled chiral organic semiconductors.
High Performance Chiral n-Channel Single Crystal Based Phototransistors with Hydrazine Doping
안재용,( Xiaobo Shang ),송인호,이정현,최완욱,( Hiroyoushi Ohtsu ),김진철,한명근,구진영,곽상규,오준학 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Supramolecular chirality is a very intriguing property because of its great potential for use in various areas including chemistry, material science, and nanoscience. Here, novel chiral perylene diimides are synthesized and transformed into single crystals using a solventdiffusion method. Interestingly, different solvents could form different shapes of single crystals. Phototransistors based on an individual single crystal showed a high mobility of 0.25㎠ V<sup>-1</sup>s<sup>-1</sup>, a large photoresponsivity of 187 A W<sup>-1</sup>, and a detectivity of 1.3 × 10<sup>15</sup>. Furthermore, after the devices were doped by saturated hydrazine vapor for only 5 minutes, their optoelectronic performances were sharply increased. This study will expedite the development of n-type doping method and chiral organic semiconductors for potential application in organic optoelectronics.
The Application of Chiral Self-Discriminated Photochromic Metal-Organic Frameworks in Photodetector
송인호,( Xiaobo Shang ),최완욱,정관영,안재용,이정현,한명근,구진영,( Masaki Kawano ),( Hiroyoushi Ohtsu ),곽상규,오준학 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Homochiral supramolecular metal-organic frameworks (SMOFs) crystals were synthesized from alanine-based NDI ligands by solvothermal reaction. Chiral self-discrimination was observed upon mixing the two enantiomers with calcium nitrate. Upon irradiation with UV light, the conductivity of the resulting homochiral and heterochiral SMOFs significantly increased and their color changed from yellow to dark brown. This photochromic behavior was attributed to electrontransfer- related chemical processes inside the SMOF structure or by photo-induced radical formation in the NDI ligands. In addition, these SMOFs exhibited excellent photoswitching properties, which were related to the generation and depletion of radicals upon exposure to UV light or darkness, respectively. We quantitatively characterize SMOFs with redox NDI ligands with regard to their photophysical properties, and describe their photoswitching behavior.