Do you know any reason (with reference) why nanocrystals (7-15 nm) of PbSe deposited on TiO2 could show indirect optical transitions? Thank you all.
I was wrong to think it has an indirect bandgap, deleted the initial comment
What method allowed you to determine such kind of transitions in PbSe?
Actually, Shimadzu uv-3600 was used. Operation region from 210 nm to 3200 nm.
Don't you think about light scattering and wide particles size distribution influence on linearization result?
Absorption spectra can be significantly pertubed by light scattering especialy in the sub-bang-gap region. https://www.researchgate.net/profile/Mikalai_Malashchonak/publication/276164035_Band-gap_and_sub-band-gap_photoelectrochemical_processes_at_nanocrystalline_CdS_grown_on_ZnO_by_successive_ionic_layer_adsorption_and_reaction_method/links/56c5d54808ae736e70492566.pdf
Article Band-gap and sub-band-gap photoelectrochemical processes at ...
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