Abstract
Magnesium-tin oxide (MTO) became a cell storage material after strong UV irradiation, and the appearance of the photochromic phenomenon was the sign of initiation of such a function. This phenomenon is not an independent behavior occurring in magnesium-tin oxide films, but we found that the phenomenon occurred in the interface between the MTO layer and indium tin oxide layer prepared under the MTO layer. To clarify this phenomenon, analysis of the MTO layer is the key issue and investigation under the environmental condition is required. The photochromic color change does not reproduce by excess heating treatment. In this paper, we focused on the change in the ionization potential of the MTO film before/after the reversible color change and irreversible erase, and to achieve this experiment, we constructed a novel photoelectron yield spectrometer and measured the ionization potential of a magnesium tin oxide film.
Highlights
Photochromism1–3 is a phenomenon in which the color of a substance changes reversibly upon light irradiation or heating
indium tin oxide (ITO) is reduced by UV irradiation, and the sample is colored by indium precipitating at the ITO/magnesium tin oxide (MTO) interface
Before discussing the ionization potential of MTO depending on its photochromic states, we demonstrate that our photoelectron yield spectroscopy (PYS) system can measure accurately
Summary
Photochromism is a phenomenon in which the color of a substance changes reversibly upon light irradiation or heating It has attracted attention for applications in optical memory and optical switches.. MTO cracks by heating, the exposure of ITO to the atmosphere leads to the oxidation of indium, and the sample returns to transparency This phenomenon has been considered to occur independently in the MTO layer, but they clarified that there was an interaction between ITO and MTO at the interface. Photoelectron yield spectroscopy (PYS) was used to measure the ionization potential of MTO This method applies a photoelectric effect; when the sample is irradiated with UV light of a specific photon energy, electrons with lower binding energies are emitted from the sample surface. We built a photoelectron yield spectrometer and used it to measure the ionization potential of MTO deposited on ITO to confirm whether the ionization potential changes due to the expression of photochromism
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