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A "Phase Separation" Molecular Design Strategy Towards Large-Area 2D Molecular Crystals
Beibei Fu1, Cong Wang1, Yantao Sun2
1Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China.
Advanced Materials (Deerfield Beach, Fla.)
|July 4, 2019
Summary
A new "phase separation" molecular design enables the growth of large-area two-dimensional molecular crystals (2DMCs). These 2DMCs achieve high-performance organic phototransistors with record-breaking photosensitivity and detectivity.
Area of Science:
- Materials Science
- Organic Electronics
- Crystallography
Background:
- Two-dimensional molecular crystals (2DMCs) possess unique optoelectronic properties, making them promising for various applications.
- Solution self-assembly is a viable method for fabricating large-area 2DMCs, but precise molecular design and understanding structure-assembly relationships are lacking.
Purpose of the Study:
- To propose a "phase separation" molecular design strategy for creating 2DMCs.
- To achieve layer-by-layer growth of millimeter-sized monolayer or few-layer 2DMCs.
- To develop high-performance organic phototransistors utilizing these 2DMCs.
Main Methods:
- Development of a "phase separation" molecular design strategy.
- Solution self-assembly for growing 2DMCs.
- Fabrication and characterization of organic phototransistors.
Main Results:
- Successful layer-by-layer growth of millimeter-sized monolayer or few-layer 2DMCs was achieved.
- Organic phototransistors demonstrated unprecedented photosensitivity (2.58 × 10^7), high responsivity (1.91 × 10^4 A W^-1), and high detectivity (4.93 × 10^15 Jones).
Conclusions:
- The proposed "phase separation" molecular design strategy is effective for synthesizing large-area 2DMCs.
- This strategy provides a pathway for designing novel organic semiconductors for advanced organic optoelectronics.