Self‐Limited Epitaxial Growth of Patterned Monolayer Organic Crystals for Polarization‐Sensitive Phototransistor with Ultrahigh Dichroic Ratio

Monolayer organic crystals provide an unprecedented opportunity for studies on the intrinsic charge transport of organic semiconductors because of their 2D nature that is free of grain boundaries with fewer defects. However, due to the spatially stochastic molecular nucleation and the difficulty in...

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Published in:Advanced functional materials Vol. 34; no. 4
Main Authors: Chen, Jinhui, Wang, Jinwen, Chen, Shuai, Pan, Jing, Jia, Ruofei, Wang, Chaoqiang, Wu, Xiaofeng, Jie, Jiansheng, Zhang, Xiujuan
Format: Journal Article
Language:English
Published: Hoboken Wiley Subscription Services, Inc 01.01.2024
Subjects:
Assembly
Benzothiophene
Charge transport
Crystal defects
Crystallization
dichroic ratio
Dichroism
Epitaxial growth
Grain boundaries
monolayer organic crystal arrays
Monolayers
Nucleation
Optoelectronic devices
Organic chemistry
Organic crystals
Organic semiconductors
patterned growth
Phototransistors
Physical vapor deposition
Physicists
Polarization
polarization‐sensitive photodetector
self‐limited epitaxial growth
Substrates
Wetting
ISSN:1616-301X, 1616-3028
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Summary:Monolayer organic crystals provide an unprecedented opportunity for studies on the intrinsic charge transport of organic semiconductors because of their 2D nature that is free of grain boundaries with fewer defects. However, due to the spatially stochastic molecular nucleation and the difficulty in controlling monolayer assembly, large‐scale growth of monolayer organic crystals remains a formidable challenge. Here, a self‐limited epitaxial growth strategy is proposed to realize large‐area patterned growth of monolayer organic crystals via physical vapor deposition process. Specifically, this approach confines the molecular nucleation and crystallization in defined wetting patterns, whose sizes are smaller than the mean free path of the molecules on substrate, enabling the formation of a single nucleus in wetting pattern. Meanwhile, the intermolecular lattice mismatch between 2,7‐dialkyl[1]benzothieno[3,2‐b][1]benzothiophene (Cn‐BTBT, n = 8 and 10) derivatives inhibits vertical molecular stacking, thereby promoting the monolayer assembly of organic molecules. Using this approach, centimeter‐sized patterned growth of mixed Cn‐BTBT monolayer organic crystals is achieved. Polarization‐sensitive phototransistors based on the monolayer organic crystals exhibit ultrahigh dichroic ratio up to 4.6 × 103, on par with the commercial polarizers (103). This work sheds light on large‐scale patterned growth of monolayer organic crystals toward high‐performance optoelectronic devices. A self‐limited epitaxial growth strategy is developed for large‐area patterned growth of monolayer organic crystals. This approach confines the molecular nucleation and crystallization in defined wetting patterns. Intermolecular lattice mismatch between C8‐BTBT and C10‐BTBT inhibits the vertical molecular stacking, promoting the monolayer assembly. Polarization‐sensitive phototransistors based on the monolayer organic crystals exhibit an ultrahigh dichroic ratio of 4.6 × 103.
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ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202308298