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Large-Scale Single-Crystal Organic Semiconductor/Graphene Heterojunctions for High-Performance Phototransistor Arrays
Guangxin Sun1, Beibei Fu1, Cong Zhang1
1College of Electronic and Information Engineering, Qingdao University, Qingdao266071, China.
Nano Letters
|July 20, 2026
Summary
We developed a scalable method for fabricating large, crystalline organic-inorganic van der Waals heterojunctions (vdWHs). These vdWHs enable high-performance broadband photodetectors for advanced optoelectronic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Two-dimensional (2D) organic-inorganic van der Waals heterojunctions (vdWHs) show promise for integrated optoelectronics.
- Scalable fabrication of highly crystalline vdWHs with clean interfaces is a significant challenge.
Purpose of the Study:
- To develop a scalable fabrication method for centimeter-scale organic-inorganic vdWHs.
- To investigate the optoelectronic properties of the fabricated heterostructures.
Main Methods:
- Combining wet transfer of monolayer graphene with air-liquid interfacial growth of single-crystal C6-DPA.
- Fabricating C6-DPA/graphene phototransistors and large-area phototransistor arrays.
Main Results:
- Achieved centimeter-scale organic-inorganic vdWHs with clean interfaces.
- Demonstrated broadband photodetection (365–808 nm) with high responsivity (1.06 × 10^6 A/W) and detectivity (8.42 × 10^15 Jones).
- Fabricated uniform, large-area phototransistor arrays with high-contrast imaging capability.
Conclusions:
- Established a scalable route for producing high-quality, large-area organic-inorganic vdWHs.
- Highlighted the potential of these vdWHs for high-performance integrated optoelectronic systems.
