【摘 要】
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Field emissions (FE) from La-doped zinc oxide (ZnO) films are both experimentally and theoretically investigated. Owing to the La-doped effect, the FE character
【机 构】
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Laboratory of Thin Film Materials, College of Materials Science and Engineering, Beijing University
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Field emissions (FE) from La-doped zinc oxide (ZnO) films are both experimentally and theoretically investigated. Owing to the La-doped effect, the FE characteristic of ZnO films is remarkably enhanced compared with an undoped sample, and a startling low tu-on electric field of about 0.4V/μm (about 2.5V/μm for the undoped ZnO films) is obtained at an emission current density of 1μA/cm2 and the stable current density reaches 1mA/cm2 at an applied field of about 2.1V/μm. A self-consistent theoretical analysis shows that the novel FE enhancement of the La-doped sample may be originated from its smaller work function. Due to the effect of doping with La, the Fermi energy level lifts, electrons which tunnelling from surface barrier are consumedly enhancing, and then leads to a huge change of field emission current. Interestingly, it suggests a new effective method to improve the FE properties of film materials.
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