Photophysical and Spectroscopic dataset for Carrier Dynamics and Recombination in Ag-In-Zn-S Quantum Dots

Materials
Silver nitrate (99%), indium(II) chloride (99%), zinc stearate (technical grade), 1-dodecanethiol
(DDT, 98%), sulfur (99%), 1-octadecene (ODE, 90%), oleylamine (OLA, 70%), methyl viologen
dichloride hydrate, 98% were supplied by Sigma-Aldrich (Merck KGaA, Darmstadt,
Germany).

Synthesis of Ag-In-Zn-S Quantum Dots
All operations were carried out under a constant dry argon flow. Silver nitrate (0.03 g, 0.18 mmol), indium(II) chloride (0.11 g, 0.59 mmol), DDT (0.20 g, 1.0 mmol), and zinc stearate (0.33 g, 0.54 mmol for A1 or 0.66 g, 1.08 mmol for A2) were mixed with ODE (15 mL) in a three-neck flask. The mixture was heated to 150 °C until a homogeneous solution was formed. Then, 1 mL of the S/OLA precursor was quickly injected into the reaction solution. The temperature was increased to 180 °C, and the mixture was kept at this temperature for 60 min. After the mixture was cooled to room temperature, toluene (10 mL) was added, and the reaction mixture was centrifuged; the isolated black precipitate consisting of organic waste and agglomerated particles was separated. The supernatant was treated with 30 mL of acetone, leading to the precipitation of the desired fraction of quantum dots. The quantum dots were separated by centrifugation (7000 rpm, 5 min) and then redispersed in nonpolar solvents such as toluene, dichloromethane, chloroform.

Conjugating Ag-In-Zn-S Quantum Dots with Methyl Viologen
15 μl of MV^2+ solution (∼230 mg of MV^2+ in 1 ml of methanol) was added to 200 μl of concentrated Ag-In-Zn-S chloroform solution. The sample became cloudy, which was
attributed to an excess of undissolved MV^2+. The solution was sonicated, evaporated and redissolved in 200 μl of chloroform. The resulting solution was passed through a syringe filter with a pore size of 0.22 μm. As a result, a clear solution of Ag-In-Zn-S QDs with adsorbed
MV2+ molecules was obtained.