Publication date: 27th June 2014
Lead chalcogenide nanoparticles have a large Bohr radius and therefore they attract a lot of scientific attention for fundamental studies of strongly confined quantum systems. However, their limited chemical stability requires encapsulation of the devices under inert conditions, prevents a study of their properties under ambient conditions (without host matrix) and hinders their encapsulation in electro-optical devices. Over years, various post-synthesis passivation techniques were examined. However some of them are complex, safety dangerous and time consuming. Recently synthesis in situ surface passivation approach was proposed. This technique makes it possible to synthesize PbS and PbSe nanoparticles that show stable photoluminescence quantum efficiency in TCE solvent other a month.Here we report spectral and temporally resolved results of chlorine passivated PbS in tetrachoroethylene solution (TCE) and as a film.The films were examined upon exposure to air and to different chemical species that are used in microeletronic fabrication processes. The experimental results show excellent chemical stability and exhibit signatures of energy transfer in film.
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