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Energy level evolution of air and oxygen exposed molybdenum trioxide films
13.Y. Nakayama, K. Morii, Y. Suzuki, H. Mashida, S. Kera, N. Ueno, H. Kitagawa, Y. Noguchi, and H. Ishii, Adv. Funct. Mater. 19, 3746 (2009).
14.R. C. Weast, Handbook of Chemistry and Physics, 51st ed., (The Chemical Rubber Co., Cleveland, Ohio, 1970).
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The evolution of electronic energy levels of controlled air and oxygen exposed molybdenum trioxide films has been investigated with ultraviolet photoemissionspectroscopy, inverse photoemissionspectroscopy, and x-ray photoemission spectroscopy. We found that while most of the electronic levels of as deposited films remained largely intact, the reduction in the work function (WF) was substantial. The gradual surface WF change from 6.8 to 5.3 eV was observed for air exposed film, while oxygen exposed film the surface WF saturated at . Two distinct stages of exposure are observed, the first dominated by oxygen adsorption for (L) exposure and at the final step moisture absorption .
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