Dear researchers
I would like to ask about the electron mobility through the conduction band. I have n-type TiO2 nanotube doped with Cd (where its oxide give a n-type semiconductor). I applied this nanotube is for water splitting. the CB level of the CdO is 0.74 eV while for TiO2, it is -0.25 eV. My question is can electrons move from the CB of CdO to that of TiO2?
Regards,
Dear Mohamed S. Mahmoud,
I think the attached review paper will be very helpful for your question.
I did not see any paper describing the movement of electrons from higher CB to lower CB.
Electrons always move from Lower CB to higher CB.
Dear Mohamed Asim Khan
Thank you for your answer. The paper is very interesting. We got a strange behavior of Cd-doped TiO2 nanotube similar to p-n heterojunction photocatalyst (e. g. Mn-dope TiO2 nanotube), and that's why I asked this question. The paper you attach provided some possible explanations.
Regards,
Dear Mohamed S. Mahmoud,
Depending on the position of your valence band, you can expect the formation of Z-scheme where the electrons at CB level don't lose energy but in fact recombination occurs for electrons between conduction band and valence band. I think you need to consider Z-scheme as a possible charge transfer mechanism as compared with conventional Type (II) charge transfer mechanism.
You can read our recent publication for this type of charge transfer mechanism.
Article Enhanced Photoelectrochemical Performance of Z-scheme g-C3N4...
Dear Javad
Thank you for the clarification. Actually I did not realize the Z scheme before. Since my specilization is chemical engineering, these two papers added new information to my experience.
Regards,