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The electrical field from the gate of CNFET can not affect the transistor.

Hi all,

I tried to fabricate the Carbon nanotube field effect transistor (CNFET) for around half a year, however, none of them is working till now. The main problem was the source to drain current Id did not change much (less than 1 order) corresponding to the gate voltage.

I have tried different design, including 1. I used the heavily doped silicon substrate as the gate and CNT bridging two pre-patterned electrodes. (the electrode may block the electric field from the gate???)

2. I tried to disperse the CNT on top of the SiO2 on top of heavily doped silicon, and use the e-beam lithography to contact two ends of the CNT. But gate effect as well. (Although just try once)

3. I also tried the top gate design. Firstly, I disperse the CNT to bridge two pre-fabricated Au electrodes, then deposit an insulator on the top. Finally an Al gate electrode will be pattern on the top of the insulator. (Still no gate effect, although try once as well)

4. The design using the Al2O3 as insulator was also tried. The Aluminum was pattern between two prefabricate Au electrodes, then O2 plasma was used to bombard the Al to generate a thin layer of Al2O3 with around 3nm. (No gate effect as well)

Did anyone who had fabricated Carbon nanotube field effect transistor or Nanowire transistor know what the reasons are? Or is there any trick to make the CNT transistor? Any advice is highly appreciated. Thanks in advanced.


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    Hi First, you can try to deposit the nanotube on SIO2 substrate and to pattern the drain and source electrodes on the nanotube, after you proceed to an annealing. this for the drain and source contact. The best material for the Drain and source electrodes is the Pd. Secondly, for to depose a High-k Dielectrics you must functionalize your carbon nanotube by the molecule DT-40 of DNA, to ensure to compatibility with the CNT. I hope sincerely then that help you. PS: if you want we can stay in touch, may be we can develop it together Good luck Samir ABBAS

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    Abhishek Gupta

    In case you need high quality and highly pure CNTs for your research, please visit

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