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Small. 2018 Feb;14(5). doi: 10.1002/smll.201701861. Epub 2017 Dec 18.

Regular Aligned 1D Single-Crystalline Supramolecular Arrays for Photodetectors.

Liu Y1,2, Feng J2,3, Zhang B4, Wu Y3, Chen Y3, Jiang L2,3,4.

Author information

1
Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
2
University of Chinese Academy of Science, Beijing, 100049, P. R. China.
3
Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
4
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-Inspired Energy Materials and Devices, School of Chemistry, Beihang University, Beijing, 100191, P. R. China.

Abstract

Solution-processed semiconductor single-crystal patterns possess unique advantages of large scale and low cost, leading to potential applications toward high-performance optoelectronic devices. To integrate organic semiconductor micro/nanostructures into devices, various patterning techniques have been developed. However, previous patterning techniques suffer from trade-offs between precision, scalability, crystallinity, and orientation. Herein, a patterning method is reported based on an asymmetric-wettability micropillar-structured template. Large-scale 1D single-crystalline supramolecular arrays with strict alignment, pure crystallographic orientation, and precise position can be obtained. The wettability difference between tops and sidewalls of micropillars gives rise to the confinement of organic solutions in discrete capillary tubes followed by dewetting and formation of capillary trailing. The capillary trailing enables unidirectional dewetting, regulated mass transport, and confined crystal growth. Owing to the high crystallinity and pure crystallographic orientation with Pt atomic chains parallel to the substrate, the photodetectors based on the 1D arrays exhibit improved responsivity. The work not only provides fundamental understanding on the patterning and crystallization of supramolecular structures but also develops a large-scale assembly technique for patterning single-crystalline micro/nanostructures.

KEYWORDS:

1D arrays; photodetectors; single crystal; supramolecular crystal; wettability

PMID:
29251425
DOI:
10.1002/smll.201701861

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