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APPLICATION OF CARBON NANOTUBES AND GRAPHENE FOR DIGITAL AND ANALOG ELECTRONICS
by
Alexander Badmaev
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(PHYSICS)
December 2011
Copyright 2011 Alexander Badmaev
Object Description
| Title | Application of carbon nanotubes and graphene for digital and analog electronics |
| Author | Badmaev, Alexander |
| Author email | badmaev@usc.edu;alex.badmaev@gmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Physics |
| School | College of Letters, Arts And Sciences |
| Date defended/completed | 2011-08-05 |
| Date submitted | 2011-10-03 |
| Date approved | 2011-10-04 |
| Restricted until | 2011-10-04 |
| Date published | 2011-10-04 |
| Advisor (committee chair) | Zhou, Chongwu |
| Advisor (committee member) |
Haas, Stephan Lu, Jia Grace El-Naggar, Mohammed Cronin, Stephen |
| Abstract | Carbon nanomaterials, one-dimensional (1D) carbon nanotubes and two-dimensional (2D) graphene, exhibit the highest electron mobility (~100,000 cm²/V/s at room temperature) among all conductors, and huge current carrying capacity of more than 10⁹ A/cm². Additionally, single-atomic thickness provides ideal electrostatic geometry for field effect devices. These properties make carbon nanomaterials to be strong candidates to replace or supplement conventional semiconductors. Theoretical and experimental studies on individual nanotubes and graphene flakes demonstrated superior performance of carbon based field-effect transistors (FETs). However, in order to realize this potential in electronic applications, scalable synthesis and assembly of carbon nanomaterials, as well as further devices design and fabrication, still remain to be a significant challenge. ❧ In this thesis, I present our developments in order to overcome some of the critical problems in practical implementation of carbon based electronics. In our approaches, we address issues starting from the scalable controllable synthesis of carbon nanomaterials and their assembly, including design of electronic devices and material methods for their fabrication, and, finally, integration of these devices into functional circuits. This broad range of issues is tightly and often inseparably inter-connected with each other, as can be seen from an example of very large scale integrated (VLSI) silicon electronics, therefore, ultimately presenting one major goal of developing carbon based electronics. ❧ The structure of the thesis is as follows. Chapter 1 gives introduction to nano-scale carbon materials, their electronic properties and problems towards realization of carbon-based electronics. Chapter 2 presents chemical vapor deposition (CVD) methods for synthesis of carbon nanotubes and graphene. CVD synthesis methods proved to be highly promising for large scale synthesis of high quality carbon nanomaterials. The presented CVD methods for scalable fabrication of aligned carbon nanotubes and large-area single layer graphene serve as a material basis for all the following chapters. Chapter 3 presents the development of carbon nanotubes for digital electronics application. Here, we use dense parallel arrays of carbon nanotubes at wafer-scale, as an effective thin film to achieve wafer-scale registration free fabrication of large number of nanotube transistors, as well as integrated circuits such as inverters, NAND and NOR logic gates. Chapter 4 presents the results in application of carbon nanotube transistors for radio frequency (RF) electronics. In particular, I report RF and linearity performance of transistors based on high-purity separated semiconducting nanotubes. Here, we conclude that semiconducting nanotube FETs exhibit high potential for highly linear RF electronics. In Chapter 5, I present our development of scalable self-aligned fabrication of graphene transistors. Here, we developed novel highly scalable and reliable fabrication of graphene transistors with improved RF device design. Finally, Chapter 6 concludes the thesis and proposes future research directions that build on our developments. These results present important steps towards practical realization of carbon based electronics. |
| Keyword | carbon nanotubes; graphene; transistors; electronics |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Rights | Badmaev, Alexander |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Archival file | uscthesesreloadpub_Volume71/etd-BadmaevAle-312.pdf |
Description
| Title | Page 1 |
| Full text | APPLICATION OF CARBON NANOTUBES AND GRAPHENE FOR DIGITAL AND ANALOG ELECTRONICS by Alexander Badmaev A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (PHYSICS) December 2011 Copyright 2011 Alexander Badmaev |
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