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Valence Band Alignment at Cadmium Selenide Quantum Dot and Zinc Oxide (101j0)Interfaces

J. Phys. Chem. C 2008, 112, 8419–8423

A typical UPS spectrum usually has two intersections with baseline, from which the width of binding energy (⊿E) is determined. The width value of He I UPS spectra (21.22 eV) is used as the standard. The valence band energy (Ev) of a semiconductor can be calculated by subtracting the width of the He I UPS spectra from the determined width of binding energy (⊿E -21.22 eV). The calculated value in eV can be converted to potentials in volts according to the reference standard for which 0 V versus RHE (reversible hydrogen electrode) equals to –4.44 eV versus vacuum level.

Dear Huslen,

UPS gives you the density of states and the information about the hybrization of valnece states.

Now, what actually you want to know form that?