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[UPS] Ultraviolet Photoelectron Spectroscopy

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[UPS] Ultraviolet Photoelectron Spectroscopy

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For qualitative and quantitative analysis of the composition of the sample surface and work function evaluation.

UPS is a method that measures the kinetic energy distribution of electrons emitted by ultraviolet light irradiation, providing insights into the valence states of the sample's surface (on the order of a few nanometers). On the other hand, it is also used to evaluate the work function of various metal materials by utilizing high energy resolution. Since it can be measured alongside XPS analysis, it is possible to investigate the qualitative and quantitative surface composition of the sample and the correlation between bonding states and work function values.

Related Link - https://www.mst.or.jp/method/tabid/138/Default.asp…

basic information

By irradiating the sample with ultraviolet light that has an energy higher than the work function value of the measured sample, electrons are emitted from the surface of the sample. (Ultraviolet light: He I line 21.22 eV) From the kinetic energy distribution of the emitted electrons (right figure), the valence electronic states of the sample are obtained, and the work function is further determined using the following formula based on the spectral width.

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Applications/Examples of results

- Evaluation of work function for metal films such as Au, Ag, and Cu - Evaluation of work function for nitride films such as TiN - Evaluation of ionization potential for oxide semiconductors - Evaluation of valence band for solar cell materials

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