Most perovskite quantum dot/ nanoparticles are cubic while some are spherical also. What is the reason behind the cubic or spherical shape of the quantum dots? Why do they have different morphology or nucleation?
Hi Rajan Kumar Singh
Generally, these materials are having a high surface area. To get a high surface area the cubic/spherical morphology is obtained. This could be a reason as I think from my side.
Waiting for other valuable answers from RG experts.
Regards
@Rajan Kumar Singh,
You raised a very interesting question regarding perovskite quantum dots/nano crystals. Their shapes very much depend on the eletronic structures of cores used, synthesis medium and the synthesis conditions such as temperature, pressure and duration. The following reference may give an idea about it
https://pubmed.ncbi.nlm.nih.gov/27712064/
Dear Arnab and Dr. Wang, thank you so much for sharing your knowledge and article about the morphology of the PQDs.
Dr. Wang, you are absolutely right about the change in morphology because of temperature, electronic structure, and used ligands. But for the same perovskite QDs, such as MAPbBr3, there are cubic and spherical morphology have been reported in many research articles. Even they used the same LARP method and temperature. On the other hand, if we think about the electronic structure of materials, the CsPbX3, MAPbX3, FAPbX3have different electronic band structures for the different halides, even their morphology is cubic. So, still, it is not clear to me, (i) why PQDs have cubic morphology? (ii) what is the mechanism behind spherical and square morphology?
Spherical PQDs
https://doi.org/10.1515/nanoph-2018-0126
https://doi.org/10.1021/ja4109209 https://doi.org/10.1016/j.orgel.2019.02.007 https://doi.org/10.1021/acs.chemmater.5b03769 DOI: 10.1039/D1RA04578D
Cubic PQDs
https://doi.org/10.1016/j.cej.2019.123629
https://pubs.acs.org/doi/10.1021/jacs.5b05602
https://doi.org/10.1016/j.molliq.2021.116557
Very important question
In fact, there are in most cases a similarity in the preparartion on this type of materials and experimental procedure don't differe so much. Then perhaps in many cases, the structural properties will not be change significantly... some other reasons are attributed to the intrinsec properties of the perovskite material that depend noticeably on the preparation conditions, even the little details during the preparation can have a major role on morphology ...
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