Related Experiment Video
Updated: Jun 26, 2026
A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
Published on: August 28, 2018
Photoresponsive nanoscale columnar transistors
Xuefeng Guo1, Shengxiong Xiao, Matthew Myers
1Center for Nanochemistry, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China. guoxf@pku.edu.cn
Stable, high-performance photosensitive field-effect transistors (FET) were created using self-assembled tetra(dodecyloxy)hexabenzocoronenes (HBCs) and single-walled carbon nanotubes (SWNTs). These nanoscale transistors exhibit excellent light sensitivity for sensing and energy applications.
Area of Science:
- Materials Science
- Nanotechnology
- Organic Electronics
Background:
- Field-effect transistors (FETs) are crucial electronic components.
- Developing stable, high-performance organic FETs is an ongoing challenge.
- Self-assembly of organic molecules offers a route to nanoscale device fabrication.
Purpose of the Study:
- To develop a general methodology for creating stable, high-performance photosensitive FETs.
- To investigate the use of self-assembled polycyclic aromatic hydrocarbons with single-walled carbon nanotubes (SWNTs) as point contacts.
- To explore the potential of these nanoscale transistors for sensing and energy harvesting.
Main Methods:
- Fabrication of nanoscale columnar transistors using liquid crystalline tetra(dodecyloxy)hexabenzocoronenes (HBCs) and SWNTs.
- Utilized two device construction approaches: coating HBC films and droplet placement on SWNT nanogaps.
- Employed thermal annealing to improve molecular self-assembly and device performance.
- Investigated device response to visible light exposure.
Main Results:
- Both device fabrication methods demonstrated typical FET behavior, confirming SWNT-molecule-SWNT nanojunctions' role.
- Thermal annealing enhanced transistor performance, increasing current modulation and gate efficiency.
- Devices exhibited significant photocurrents with an on/off ratio exceeding 3 orders of magnitude upon light exposure.
Conclusions:
- A robust methodology for fabricating stable, high-performance photosensitive FETs using self-assembled HBCs and SWNTs was established.
- These nanoscale transistors show promise for applications in ultrasensitive environmental sensing.
- The developed devices hold potential for efficient solar energy harvesting.
