MgO on Mo(001): Local Work Function Measurements above Pristine Terrace and Line Defect Sites
作者： Stefanie Stuckenholz , Christin Büchner , Markus Heyde , Hans-Joachim Freund
DOI: 10.1021/JP512575N
关键词:
摘要: We present a local spectroscopy study of thin MgO films on Mo(001), investigated with combined noncontact atomic force microscope (nc-AFM) and scanning tunneling (STM). The work function Mo(001) MgO/Mo(001) was measured field emission resonance (FER) spectroscopy. the clean surface ΦMo determined to be 4.5 eV. After deposition an 8 layer thick film, it decreased ΦMgO/Mo = 3.2 eV (ΔΦFER −1.3 eV). This shift ΔΦFER, introduced by oxide film metal function, also contact potential difference (CPD) measurements. Here, lowering ΔΦCPD −1.1 measured. Furthermore, influence line defects, in compared pristine terrace sites film. we slightly higher +200 meV above defects as sites.
acs.org
mpg.de
core.ac.uk
sci-hub.se 参考文章(45)
Clemens Barth, Claude R. Henry, Kelvin Probe Force Microscopy on MgO(001) Surfaces and Supported Pd Nanoclusters Journal of Physical Chemistry C. ,vol. 113, pp. 247- 253 ,(2009) , 10.1021/JP807340K
S. Berge, P.O. Gartland, B.J. Slagsvold, Photoelectric work function of a molybdenum single crystal for the (100), (110), (111), (112), (114), and (332) faces Surface Science. ,vol. 43, pp. 275- 292 ,(1974) , 10.1016/0039-6028(74)90231-3
Stefano Prada, Umberto Martinez, Gianfranco Pacchioni, Work function changes induced by deposition of ultrathin dielectric films on metals: A theoretical analysis Physical Review B. ,vol. 78, pp. 235423- ,(2008) , 10.1103/PHYSREVB.78.235423
John E. Sader, Suzanne P. Jarvis, Accurate formulas for interaction force and energy in frequency modulation force spectroscopy Applied Physics Letters. ,vol. 84, pp. 1801- 1803 ,(2004) , 10.1063/1.1667267
K.H. Gundlach, Zur berechnung des tunnelstroms durch eine trapezförmige potentialstufe Solid-state Electronics. ,vol. 9, pp. 949- 957 ,(1966) , 10.1016/0038-1101(66)90071-2
Wilhelm Melitz, Jian Shen, Andrew C. Kummel, Sangyeob Lee, Kelvin probe force microscopy and its application Surface Science Reports. ,vol. 66, pp. 1- 27 ,(2011) , 10.1016/J.SURFREP.2010.10.001
Sanliang Ling, Matthew B. Watkins, Alexander L. Shluger, Effects of atomic scale roughness at metal/insulator interfaces on metal work function Physical Chemistry Chemical Physics. ,vol. 15, pp. 19615- 19624 ,(2013) , 10.1039/C3CP53590H
Sabrina Sicolo, Livia Giordano, Gianfranco Pacchioni, Adsorption of Late Transition Metal Atoms on MgO/Mo(100) and MgO/Ag(100) Ultrathin Films: A Comparative DFT Study Journal of Physical Chemistry C. ,vol. 113, pp. 16694- 16701 ,(2009) , 10.1021/JP905592C
K. P. McKenna, A. L. Shluger, First-principles calculations of defects near a grain boundary in MgO Physical Review B. ,vol. 79, pp. 224116- ,(2009) , 10.1103/PHYSREVB.79.224116
T. Jaouen, G. Jézéquel, G. Delhaye, B. Lépine, P. Turban, P. Schieffer, Work function shifts, Schottky barrier height, and ionization potential determination of thin MgO films on Ag(001) Applied Physics Letters. ,vol. 97, pp. 232104- ,(2010) , 10.1063/1.3525159