Lead sulfide (PbS) colloidal quantum dots (CQDs) are of great interest for near infrared (NIR) application. Recent progress on room temperature synthesis of PbS CQDs provides a economical path toward industrial implementations. However, this system is quite different from traditional hot injection method, where the interplays of lead and sulfur precursors are notablly different. In this report, we show that traditional multiple injection protocol fails to produce up-scalable PbS CQDs. We show that the free Pb and S precursors in the reaction medium behave in a special way that precise control of their concentrations are necessary for susstainable growth of existing dots. Photodiodes made from the synthesized PbS CQDs show good photoresponses under 1550 nm NIR laser radiation.

Room temperature scalable synthesis of lead sulfide colloidal quantum dots

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ACS Fall 2022

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