How could I estimate absolute band edge position of semiconductors (both oxide and sulfides) from cyclic volatammetry analysis? What are the easy available electrolytes can be used for this purpose?
Dear Santim
Cyclic voltammetry is considered to be one of the most versatile electro analytical techniquescurrently available. It is generally the firstexperiment to be run when dealing with any electrochemically active species. The basic theory behind cyclic voltammetry is to measure the current response at the electrode surface to a specific range of potentials in an unstirred solution.
Cyclic voltametry can give us the redox potentials (in-principle, it is the valence band maximum or HOMO which can also derived from ultraviolet photoelectron spectroscopy (UPS) measuerements, but of course the presence of an electrolyte may complicate the data interpretation). Also, from the oxidation potential the conduction band minimum (or LUMO) may be estimated.
Dear Santim,
in addition to Maria's comments: the applicability of CV to determine the band edges depends a lot on your semiconductor. A couple of years ago, we did this for semiconducting nanocrystals. Have a look at the papers below.
Hope this helps,
Thomas
Article Determination of quantum confinement in CdSe nanocrystals by...
Article Determination of Defect States in Semiconductor Nanocrystals...
Article Heterogeneous Charge Transfer of Colloidal Nanocrystals in I...
Thanks Prof Thomas Nann for your kind suggestion. Your papers help me a lot.
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