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Green‐Sensitive Phototransistor Based on Solution‐Processed 2D n‐Type Organic Single Crystal
Author(s) -
Kim Jin Hong,
Oh Sangyoon,
Park Sang Kyu,
Park Soo Young
Publication year - 2019
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201900478
Subject(s) - materials science , single crystal , photodiode , monolayer , optoelectronics , acrylonitrile , diode , organic semiconductor , green light , phenylene , electron mobility , semiconductor , blue light , crystallography , nanotechnology , polymer , chemistry , copolymer , composite material
2D single crystals of down to two‐monolayer thickness are fabricated from a push–pull structure‐based green light absorbing organic n‐type semiconductor, (2 E ,2′ E )‐3,3′‐(2,5‐difluoro‐1,4‐phenylene)bis(2‐(5‐(4‐(trifluoromethyl)phenyl)thiophen‐2‐yl)acrylonitrile) (2F‐4‐TFPTA). The 2F‐4‐TFPTA 2D single crystal exhibits field‐effect electron mobility of 0.9 cm 2 V −1 s −1 in the dark and also decent photoresponsivity of 3.6 × 10 3 A W −1 under green light‐emitting diode irradiation, which is noted as the first demonstration of green‐sensitive 2D organic phototransistors. Photoresponse time of this 2F‐4‐TFPTA 2D single‐crystal device is as fast as 43 ms for the rise and 85 ms for the decay.