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© 2015 Sundaravadivel Rajarajan SYNTHESIS OF 1T-TANTALUM (IV) SULFIDE AND OBSERVATION OF CHARGE DENSITY WAVE USING SCANNING TUNNELING MICROSCOPY BY SUNDARAVADIVEL RAJARAJAN THESIS
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lyding, Joseph W. |
| Copyright Year | 2015 |
| Abstract | Over the past decade, due to the increasing interest and urgency in finding an alternate material system for post-silicon logic and opto-electronic applications, staggering progress have been made in the study of low-dimensional materials. These low-dimensional materials not only help reduce transistor footprint and improve power and performance metrics, they also exhibit very peculiar electrical properties. A particular example is the existence of a charge density wave (CDW) in 1T-Tantalum (IV) Sulfide (1T-TaS 2 ). A member of the transition metal dichalcogenide (TMDC) family, 1T-TaS 2 exhibit a periodic modulation of electronic charge density. Unlike bulk semiconductor or metals, lattice distortion in this low-dimensional material creates non-uniform, wave-like electron densities. In this thesis, we have demonstrated two bulk material growth strategies for the synthesis of 1T-TaS 2 . We have successfully grown poly-crystalline 1T-TaS 2 powder through a direct solid-solid reaction and single-crystals of 1T-TaS 2 through Iodine-assisted chemical vapor transport (CVT). After a few growth setup revisions, the growth processes have given consistently high yields. Next, we performed an ultra-high vacuum scanning tunneling microscopy (UHV-STM) study of the grown poly-crystalline 1T-TaS 2 . The powder was deposited onto an atomically flat, H-passivated silicon substrate using dry contact transfer (DCT), an in-situ deposition technique developed by the Lyding group for clean, UHV-compatible transfer of nano-materials. We managed to directly observe room-temperature CDW on the deposited nano-flakes of 1T-TaS 2 . The periodicity of the CDW lattice correspond very closely to the expected p 13 x p 13 nearly commensurate room-temperature CDW phase. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.ideals.illinois.edu/bitstream/handle/2142/78417/RAJARAJAN-THESIS-2015.pdf?sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
