2021
DOI: 10.1002/ange.202015326
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Cocrystal Engineering: Toward Solution‐Processed Near‐Infrared 2D Organic Cocrystals for Broadband Photodetection

Abstract: Large‐area 2D cocrystals with strong near‐infrared (NIR) absorption have been designed and prepared. Driven by the intermolecular charge‐transfer (CT) interactions, zinc tetraphenylporphyrin (donor) and C60 (acceptor) self‐assemble into a NIR cocrystal with absorption wavelength up to 1080 nm. By tailoring the growth solvents and processes, the cocrystal morphologies can be tuned from 1D nanowires, 2D nanosheets to large‐area 2D cocrystal films with length reaching several millimeters. Owing to the highly orde… Show more

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Cited by 6 publications
(2 citation statements)
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“…2D OSs with well-defined interfaces and precisely adjusted thicknesses have various of potential for physical implementation of phototransistors because their tunable energy gap can cover a large spectrum range from near-infrared to ultraviolet [53,54,[130][131][132][133]. Low photogating efficiency, low carrier mobility, and short photo-induced exciton diffusion distance in bulk organic materials, on the other hand, impede the development of highly efficient and fast response phototransistors [134][135][136][137]. In order to ensure photo-generated exciton separation, the thickness of the photoactive layer should be lowered below 10 nm [138].…”
Section: Circuit-type Synapsementioning
confidence: 99%
“…2D OSs with well-defined interfaces and precisely adjusted thicknesses have various of potential for physical implementation of phototransistors because their tunable energy gap can cover a large spectrum range from near-infrared to ultraviolet [53,54,[130][131][132][133]. Low photogating efficiency, low carrier mobility, and short photo-induced exciton diffusion distance in bulk organic materials, on the other hand, impede the development of highly efficient and fast response phototransistors [134][135][136][137]. In order to ensure photo-generated exciton separation, the thickness of the photoactive layer should be lowered below 10 nm [138].…”
Section: Circuit-type Synapsementioning
confidence: 99%
“…2 In the cocrystals, the highest occupied molecular orbital (HOMO) of D molecules and the lowest unoccupied molecular orbital (LUMO) of A molecules generate delocalization, which allows electron transition from D to A. 3 The electron transport is formed in a whole network of cocrystals, which makes them possess excellent electrical properties and be applied for photodetection, 4 phototransistors, 5 and organic field effect transistors. 6 A tunable organic semiconductor bandgap endows the cocrystals with novel and various optical properties, for instance, tunable light emission, 7 optical waveguides, 8 room temperature phosphorescence, 9 stimuli-responsive behaviors, 10 etc.…”
Section: Introductionmentioning
confidence: 99%