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Title Electrical resistance in carbon nanotube – insulator – metal diode arrays for optical rectenna
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Publication Date
Date Accessioned
Degree MS
Discipline/Department Mechanical Engineering
Degree Level masters
University/Publisher Georgia Tech
Abstract Vertical tunnel diode arrays made from multiwall carbon nanotubes (MWCNTs) have shown recent promise for developing a practical optical rectenna, which is a device to convert electromagnetic waves at optical frequencies to direct current. Realizing an optical rectenna requires an antenna to be coupled to a diode that operates on the order of PHz (switching speed on the order of fs). Previously, we have demonstrated an optical rectenna device by engineering MWCNT-insulator-metal (MWCNT-I-M) tunnel diodes at the tips of vertically aligned MWCNT arrays, which act collectively as the antenna. However, the high electrical resistance of the MWCNT-I-M diode resulted in poor impedance matching between diode and antenna, which limited the rectified power. Here, we address this issue of impedance mismatch through a series of experiments designed to elucidate contributions to the total electrical resistance of the device. Different combinations of metals, and metal and insulator thicknesses were tested for reduced contact resistance, while maintaining a working diode. Another development towards reducing resistance was to open MWCNT tips using oxygen plasma, which exposed multiple walls for bonding rather than just outer wall of closed tip CNTs. These developments were combined to reduce zero-bias resistance of MWCNT-I-M diode arrays to as low as 100 Ωcm2, which is 75 times lower than in our previous report.
Subjects/Keywords Optical rectenna; MWCNT array diodes; Contact resistance; Optical diodes; MWCNT antenna; Cutoff frequency
Contributors Cola, Baratunde A. (advisor); Hesketh, Peter J. (committee member); Filler, Michael A. (committee member)
Language en
Country of Publication us
Record ID handle:1853/58616
Repository gatech
Date Retrieved
Date Indexed 2018-01-25
Issued Date 2016-08-01 00:00:00
Note [degree] M.S.;

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