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Published on: November 24, 2016
The Synergy Effect of Al/Ti Electrodes on Effective Electron Injection for n-Channel Transistors and Ambipolar
Quanhua Chen1, Lijian Chen1, Hong Zhu1
1College of Integrated Circuit Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
Cost-effective aluminum (Al) and titanium (Ti) electrodes improve electron injection in organic transistors. These optimized Al/Ti electrodes enhance n-channel performance in diketopyrrolopyrrole (DPP)-based transistors, enabling efficient complementary circuits.
Area of Science:
- Organic electronics
- Materials science
Background:
- Organic field-effect transistors (OFETs) require efficient charge injection.
- Bottom-contact electrode materials significantly influence OFET performance.
Purpose of the Study:
- To investigate the use of cost-effective Al/Ti electrodes for efficient electron injection in n-channel organic transistors.
- To evaluate the impact of Al/Ti electrodes on the performance of diketopyrrolopyrrole (DPP)-based polymeric semiconductor transistors.
Main Methods:
- Fabrication of bottom-contact electrodes using aluminum (Al) and titanium (Ti).
- Characterization of electrode work function and interface stability.
- Performance evaluation of n-channel and p-channel transistors using transmission-line method (TLM) and low-frequency noise (LFN) analysis.
- Demonstration of complementary inverters using Al/Ti electrodes for n-channel and gold (Au) for p-channel.
Main Results:
- Optimized Al/Ti electrodes exhibit a low work function (approx. 4.03 eV), combining Al conductivity with Ti interface stability.
- Al/Ti electrodes significantly enhance n-channel performance while suppressing p-channel characteristics in DPP-based transistors.
- TLM and LFN measurements confirm improved electron injection efficiency.
- Complementary inverters demonstrate high static and dynamic characteristics, including ideal voltage transfer curves, high gain (~25), large noise margins (68%), and low static power consumption (19.9 μW).
Conclusions:
- Cost-effective Al/Ti electrodes are highly suitable for efficient electron injection in n-channel organic transistors.
- The use of Al/Ti electrodes enables high-performance organic complementary circuits with excellent operational characteristics.
- This work provides a pathway for developing low-cost, high-performance organic electronic devices.
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