期刊
ADVANCED SCIENCE
卷 6, 期 19, 页码 -出版社
WILEY
DOI: 10.1002/advs.201900775
关键词
2D; field-effect transistors; monolayers; organic crystals; templates
资金
- General Research Fund (GRF)
- HKU [17264016, HKU 17204517]
Solution-processed 2D organic semiconductors (OSCs) have drawn considerable attention because of their novel applications from flexible optoelectronics to biosensors. However, obtaining well-oriented sheets of 2D organic materials with low defect density still poses a challenge. Here, a highly crystallized 2,9-didecyldinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (C-10-DNTT) monolayer crystal with large-area uniformity is obtained by an ultraslow shearing (USS) method and its growth pattern shows a kinetic Wulff's construction supported by theoretical calculations of surface energies. The resulting seamless and highly crystalline monolayers are then used as templates for thermally depositing another C-10-DNTT ultrathin top-up film. The organic thin films deposited by this hybrid approach show an interesting coherence structure with a copied molecular orientation of the templating crystal. The organic field-effect transistors developed by these hybrid C-10-DNTT films exhibit improved carrier mobility of 14.7 cm(2)V(-1)s(-1) as compared with 7.3 cm(2)V(-1)s(-1) achieved by pure thermal evaporation (100% improvement) and 2,8 cm(2)V(-1)s(-1) achieved by solution sheared monolayer C-10-DNTT. This work establishes a simple yet effective approach for fabricating high-performance and low-cost electronics on a large scale.
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