Is there any way to determine HOMO and LUMO energy of a semiconductor from UV-vis transmittance data please?

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Xuhua Wang

Cyclic voltammetry is a simple way to determine HOMO and LUMO energy levels of organic semiconductors.

Please see the link below:

https://www.sciencedirect.com/science/article/abs/pii/S0379677917303041

Jürgen Weippert

UV-Vis will give you the optical band gap, but not the absolute positions of the bands with respect to the Fermi level.

If you don't have UPS to determine the HOMO (LUMO isn't visible in UPS, anyway), do you have access to an STM where you could do STS?