Current anisotropy of carbon nanotube diodes: Voltage and work function dependence

Perello, David J.; Seong Chu Lim; Seung Jin Chae; Innam Lee; Kim, Moon. J.; Young Hee Lee; Minhee Yun
June 2010
Applied Physics Letters;6/28/2010, Vol. 96 Issue 26, p263107
Academic Journal
Here, we report a performance analysis on carbon nanotube (CNT) Schottky diodes using source-drain current anisotropy. An analytical model is derived based on thermionic field emission and used to correlate experimental data from Pd–Hf, Ti–Hf, Cr–Hf, Ti–Cr, and Pd–Au mixed metal devices fabricated on one single 6 mm long CNT. Results suggest that the difference in work functions of the two contact-metals, and not a dominant Schottky contact, determines diode performance. Results are further applied and demonstrated in a reversible polarity diode.


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