Dear Shay, First of all, if the lamella structure is smooth enough, x-ray reflectivity will tell you something about the parallelism of the layers. If the layers aren’t smooth enough, or you’re more interested in the orientation of the lattice planes, then pick one reflection and perform an omega scan at that 2theta angle. Preferably a higher order reflection, in case the ordering isn’t that perfect. With those you’ll have plenty of more information. I’m not sure what you mean by that “obtaining a broad peak at low 2theta of 0.01deg”, what kind of scan type are you referring to? In any case that angle is, well, ridiculously low, or I’m just having serious understanding issues ☺
The answer is a bit vague, I know, but it depends a lot on how the deposition was made, on which substrate, etc. etc. Feel free to ask me more. Best regards, Mikko -- Mikko Heikkilä, M.Sc. Laboratory Engineer Department of Chemistry P.O.Box 55 (Chemicum, A.I. Virtasen aukio 1) FI-00014 University of Helsinki mikko.j.heikk...@helsinki.fi From: rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] On Behalf Of Shay Tirosh Sent: 14. lokakuuta 2018 16:15 To: rietveld_l@ill.fr Subject: Super lattice conformation CsPbI3 and CH3NHPbI3 are perovskite structure with different bandgap. Those materials have been deposited on a substrate to form an alternating sandwich lamela structure. Each slab is 15nm thick. The number of slabs is 8. We consider running XRD experiment to realize how parallel are the layers. Obtaining a broad peak at a low 2teta of 0.01deg will indicate on very good parallelism. Can you please comment on this approach Please note those perovskites are highly sensitive to high energy radiations. Thank you from advance Shay
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