Recently, I am doing RHEED on rutile TiO2(110) single crystal substrate. The samples are 5 X 5 X 0.5 mm3, and have atomically flat surface morphology. The RHEED patterns seem fair, but sometimes part of them is either bent or offset. I attached two typical images. Does anyone know the reason for this?
Yang Wang
Thanks to t Hadeel.
TiO2 has a band gap~3.0 eV, an insulator. Before RHEED, I usually anneal TiO2 at 600 C to introduce some O vacancies to improve the conductivity.
I have to say due to the design of the sample stage, the TiO2 is not grounded properly. Maybe it is the reason.
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