1. Nanodevices and nanostructures: quantum wires and quantum dots ECE 423 Final Project Wan-Ching Hung Dec 12,2006

2. Quantum Dots and Quantum Lines A quantum dot typically contains between 1 to 200 atoms in diameter and its length, width, and high are generally defined less than 100nm. The electron is retrained by Fermi wavelength. Quantum dot is confined in 3 dimensions and quantum line is confined in 2 dimensions.

3. Quantum Dots Applications Si single electron transistors Quantum Computer

4. Quantum Dots Applications Nanobarcodes nanobarcodes are made different quantum wires of different metals that have different reflectivity. Molecule capsule in drug delivery system

5. Quantum Confinement Under 100nm, the wave property of electron can not be ignored.

6. Tunneling Effect

7. Coulomb Blockade a Coulomb blockade is the increased resistance at small bias voltage of an electronic device comprising at lease one low-capacitance tunnel junction.

8. Bottom-Up

9. Self Assembly Applicatoins: solar cell, light-emitting diodes, capsule in drug delivery system

10. Chemical Colloidal Method

11. Lithography and Etching Lithography: electron beam, ion beam, nanoimprint, dip pen nanolithography Etching: wet etching, dry etching, plasma, implantation, photo etching

12. Split-gate Approach Use additional voltage to create 2 dimensional confinements to control the shape and size of the quantum dot ’ s gate. It ’ s a combination of e beam lithography, evaporation, lift off, contact annealing