... Properties and Sensor Performance of Zinc Oxide Thin Films by Yongki Min Submitted to the Department of Materials Science and Engineering on August 21, 2003 in Partial Fulfillment of the ... Education 2003 - Ph.D., Materials Science and Engineering, MIT, Cambridge, MA, USA Thesis title: Properties and Sensor Performance of Zinc Oxide Thin Films 1990 - M.S., Metallurgical Engineering, ... exp − Εg kT (2.19) where Nc and Nv are the density of state of conduction band and valence band, respectively, and Eg is the energy band gap of materials When electrons and holes are tightly bound...