Inorganic Chemistry, Vol.55, No.6, 3175-3180, 2016
Dissolution of Sn, SnO, and SnS in a Thiol-Amine Solvent Mixture: Insights into the Identity of the Molecular Solutes for Solution-Processed SnS
Binary solvent mixtures of alkanethiols and 1,2ethylenediamine have the ability to readily dissolve metals, metal chalcogenides; and metal oxides under ambient conditions to enable the facile solution processing of semiconductor inks; however, there is little information regarding the chemical identity of the resulting solutes. Herein, we examine the molecular solute formed after dissolution. of Sn, SnO, and SnS in a binary solvent mixture comprised of 1,2ethanedithiol (EDT) and 1,2-ethylenediamine (en). Using a combination of solution Sn-119 NMR and Raman spectroscopies, bis(1,2-ethanedithiolate)tin(II) was identified as the likely molecular solute present after the dissolution of Sn, SnO, and SnS in EDT-en, despite the different bulk material compositions and oxidation states (Sn degrees and Sn2+). All three semiconductor inks can be converted to phase-pure, orthorhombic SnS after a mild annealing step (similar to 350 degrees C). This highlights the ability of the EDT-en solvent mixture to-dissolve and convert a variety of low-cost precursors to SnS semiconductor material.