Optoelectronics with Carbon Nanotubes
Optoelectronics with Carbon Nanotubes Optoelectronics with Carbon Nanotubes
3. Conclusions ................................................................................................... 66 Chapter IV Narrow-Band Electroluminescence from a Single Carbon-Nanotube p-n Diode ............................................................... 67 1. Introduction ................................................................................................... 67 2. Transport characteristics of the single CNT p-n diode .................................... 68 3. Electroluminescence mechanism and characteristics ...................................... 70 4. Conclusions ................................................................................................... 80 Chapter V The Polarized Carbon Nanotube Thin Film LED .............................. 82 1. Introduction ................................................................................................... 82 2. Physical characteristics of CNT films and top-gated devices .......................... 83 3. Transport characteristics of the CNT film diode ............................................. 85 4. Electroluminescence characteristics of the CNT film diode ............................ 90 5. Investigation of electroluminescence spectra .................................................. 96 6. Conclusions ................................................................................................. 106 Summary ................................................................................................................... 107 Bibliography .............................................................................................................. 110 vii
Chapter I List of Figures Figure I-1 The honeycomb structure of a graphene sheet ................................................ 4 Figure I-2 Energy dispersion of graphene ....................................................................... 6 Figure I-3 The Brillouin zones of metallic and semiconducting SWNTs. ........................ 7 Figure I-4 One-dimentional energy dispersion of metallic and semiconducting SWNTs. ......................................................................................................... 8 Figure I-5 First and second transitions between van-Hove singularities .......................... 9 Figure I-6 Phonon energy dispersion for (19,0) CNT .................................................... 13 Figure I-7 Schematic illustration of a standard bottom-gated CNTFET ......................... 18 Figure I-8 Schematic band structure of the first conduction and valence bands in the “on” and “off” states .............................................................................. 19 Figure I-9 Schematic illustrations of band structures in ambipolar and unipolar conduction ................................................................................................... 21 Figure I-10 Ambipolar and unipolar emission mechanisms........................................... 22 Chapter II Figure II-1 Schematics of a back-gated CNTFET device .............................................. 31 Figure II-2 Schematics of a CNT p-n junction .............................................................. 32 Figure II-3 Schematics of the optics to detect emitted light. .......................................... 35 Chapter III Figure III-1 Semi-log plot of drain current as a function of gate voltage ....................... 40 Figure III-2 Source-Drain sweep showing saturation .................................................... 41 Figure III-3 Change in transport from predominantly p-type to n-type FET .................. 42 viii
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3. Conclusions ................................................................................................... 66<br />
Chapter IV Narrow-Band Electroluminescence from a Single<br />
<strong>Carbon</strong>-Nanotube p-n Diode ............................................................... 67<br />
1. Introduction ................................................................................................... 67<br />
2. Transport characteristics of the single CNT p-n diode .................................... 68<br />
3. Electroluminescence mechanism and characteristics ...................................... 70<br />
4. Conclusions ................................................................................................... 80<br />
Chapter V The Polarized <strong>Carbon</strong> Nanotube Thin Film LED .............................. 82<br />
1. Introduction ................................................................................................... 82<br />
2. Physical characteristics of CNT films and top-gated devices .......................... 83<br />
3. Transport characteristics of the CNT film diode ............................................. 85<br />
4. Electroluminescence characteristics of the CNT film diode ............................ 90<br />
5. Investigation of electroluminescence spectra .................................................. 96<br />
6. Conclusions ................................................................................................. 106<br />
Summary ................................................................................................................... 107<br />
Bibliography .............................................................................................................. 110<br />
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