Gunver Nielsen
Technical University of Denmark
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Publication
Featured researches published by Gunver Nielsen.
Journal of Vacuum Science & Technology B | 2009
Lasse Bjørchmar Thomsen; Gunver Nielsen; Søren Bastholm Vendelbo; Martin Johansson; Ole Hansen; Ib Chorkendorff
Ultralarge metal-oxide-semiconductor (MOS) devices with an active oxide area of 1cm2 have been fabricated for use as electron emitters. The MOS structures consist of a Si substrate, a SiO2 tunnel barrier (∼5nm), a Ti wetting layer (3–10A), and a Au top layer (5–60nm). Electron emission from the Au metal layer to vacuum is realized from these devices by applying bias voltages larger than the work function of the Au layer. The emission is characterized for Au layers with thicknesses ranging from 5to60nm nominally. The emission efficiency changes from close to 10−6 to 10−10. The Ti wetting layer is varied from 3to10A which changes the emission efficiency by more than one order of magnitude. The apparent mean free path of ∼5eV electrons in Au is found to be 52A. Deposition of Cs on the Au film increased the electron emission efficiency to 4.3% at 4V by lowering the work function. Electron emission under high pressures (up to 2bars) of Ar was observed.
Surface Science | 2005
Frank Abild-Pedersen; Ole Lytken; Jakob Engbæk; Gunver Nielsen; Ib Chorkendorff; Jens K. Nørskov
Surface Science | 2010
Martin Johansson; Egill Skúlason; Gunver Nielsen; Shane Murphy; R.M. Nielsen; Ib Chorkendorff
Surface Science | 2006
Jakob Engbæk; Gunver Nielsen; Jane Hvolbæk Nielsen; Ib Chorkendorff
Catalysis Today | 2005
Michael A. E. Andersen; Ole Lytken; Jakob Engbæk; Gunver Nielsen; Nana Maria Pii Schumacher; Martin Johansson; Ib Chorkendorff
Physical Review B | 2007
Lasse Bjørchmar Thomsen; Gunver Nielsen; Søren Bastholm Vendelbo; Martin Johansson; Ole Hansen; Ib Chorkendorff
Surface Science | 2007
Jakob Engbæk; Gunver Nielsen; Jane Hvolbæk Nielsen; Ib Chorkendorff
Physical Review B | 2009
M.P. Ray; Russell Lake; C. E. Sosolik; Lasse Bjørchmar Thomsen; Gunver Nielsen; Ib Chorkendorff; Ole Hansen
Applied Surface Science | 2009
Gunver Nielsen; Lasse Bjørchmar Thomsen; Martin Johansson; Ole Hansen; Ib Chorkendorff
Archive | 2009
Gunver Nielsen; Ib Chorkendorff; Ole Hansen