Tuning of Coupling and Surface Quality of PbS Nanocrystals via a Combined Ammonium Sulfide and Iodine Treatment

The Journal of Physical Chemistry Letters
Haitao ZhangFrank W Wise

Abstract

Surface states of colloidal nanocrystals are typically created when organic surfactants are removed. We report a chemical process that reduces surface traps and tunes the interparticle coupling in PbS nanocrystal thin films after the surfactant ligands have been stripped off. This process produces PbS/PbI2 core/shell nanocrystal thin films via a combined ammonium sulfide and iodine treatment. These all-inorganic nanocrystal thin films are air-stable and exhibit bright emission with optimum photoluminescence quantum yield close to that of pristine PbS nanocrystals passivated by oleate ligands. Interparticle coupling of post-treatment nanocrystal thin films is continuously tunable by varying the iodine treatment process. Optical studies reveal that this method can produce PbS nanocrystal thin films superior in both coupling and surface quality to nanocrystals linked by small molecules such as ethanedithiol or 3-mercaptopropionic acid.

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Citations

Apr 28, 2017·Journal of the American Chemical Society·Brent A KoscherA Paul Alivisatos
Dec 21, 2016·Chemical Communications : Chem Comm·Youngjin JangEfrat Lifshitz
Jan 26, 2018·Scientific Reports·José Maria Clemente da Silva FilhoFrancisco Chagas Marques
Aug 1, 2018·Chemical Reviews·Sandeep Ghosh, Liberato Manna
Jul 2, 2019·The Journal of Physical Chemistry Letters·Xuelin FanAlexander Eychmüller

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