Large-scale Synthesis of Monodisperse PbS Quantum Dots
PbS quantum dots (QDs) are a promising material for designing of modern solar energy convertors. Yet, their reproducible synthesis is still intractable, since typical methods do not allow controlling the growth of PbS nanocrystals due to the high reaction rates. Here we propose the two-step synthetic procedure, which allows controlling precisely nanocrystal growth on the second stage. The first step allows obtaining small PbS QDs by the standard hot injection method, which are then slowly grown to a desired size on the second stage. By use of this method, we were able to obtain gram-scale batches of PbS QDs with high reproducibility of the photoluminescence properties of the synthesis product.
Keywords: PbS quantum dots, nanoparticles growth, infrared luminescence
 Vokhmnintcev K.V., Samokhvalov P.S., Nabiev I.R., “Charge transfer and separation in photoexcited quantum dot-based systems”, NanoToday, (2016), 11 (2), 189–211.
 Günes S., Fritz K.P., Neugebauer H., Sariciftci N.S., Kumar S., Scholes G.D., “Hybrid solar cells using PbS nanoparticles”, Solar Energy Materials and Solar Cells, (2007), 91(5), 420-423.
 Wang C., Thompson R.L., Ohodnicki P., Baltrus J., Matranga C.,” Size-dependent photocatalytic reduction of CO2 with PbS quantum dot sensitized TiO2 heterostructured photocatalysts”, J. Mater. Chem., (2011), 21, 13452-13457
 Zhao N., Osedach T.P., Chang L., Geyer S.M., Wanger D., Binda M.T., Arango A.C., Bawendi M.G., Bulovic V., “Colloidal PbS Quantum Dot Solar Cells with High Fill Factor”, ACS Nano, 2010, 4 (7), 3743–3752
 Thanh N.T.K., Maclean N., Mahiddine S., “Mechanisms of Nucleation and Growth of Nanoparticles in Solution”, Chem. Rev. (2014), 114, 7610−7630.