Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
From ultra small to giant quantum dots of PbS
Arthur Shapiro, Gary Zaiats, and Efrat Lifshitz*Schulich Faculty of Chemistry, Russell Berrie Nanotechnology Institute, Solid State Institute, Technion-Israel Institute of Technology, Haifa 3200013, Israel (*ssefrat@technion.ac.il)
Lead chalcogenide (group IV-VI semiconductors) colloidal quantum dots (CQDs) have raised scientific and technological interest due to their optical tunability in the infrared (IR) spectral regime (0.7-3.5µm).This wide tunability range is a result of a narrow band gap and a large exciton Bohr radius (e.g. ab(PbS)= 18 nm, and ab(PbSe)= 46 nm). Moreover, they have relatively small effective masses of both the hole and electron. Therefore, they provide a unique opportunity for fundamental studies of strongly confined quantum systems.However, limited chemical stability of lead chalcogenides prevents a conducting research of their properties under ambient conditions and their technological implementation. Therefore, the passivation of QDs has become an important issue, which can be overcome by an in-situ or post synthesis surface treatment.In this work we show a method to achieve PbS CQDs that cover wide spectral regime, including as short wavelength as 530 nm, with sharp size distribution and examine their stability under ambient conditions, using spectroscopical, structural and compositional characterization methods.
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