TY - JOUR AB - A high-yield and upscalable colloidal synthesis route for the production of quaternary I 2-II-IV-VI 4 nanocrystals, particularly stannite Cu 2+xCd 1-xSnSe 4, with narrow size distribution and precisely controlled composition is presented. It is also shown here how the diversity of valences in the constituent elements allows an effective control of their electrical conductivity through the adjustment of the cation ratios. At the same time, while the crystallographic complexity of quaternary chalcogenides is associated with intrinsically low thermal conductivities, the reduction of the lattice dimensions to the nanoscale further reduces the materials thermal conductivity. In the specific case of the stannite crystal structure, a convenient slab distribution of the valence band maximum states permits a partial decoupling of the p-type electrical conductivity from both the Seebeck coefficient and the thermal conductivity. Combining these features, we demonstrate how an initial optimization of the nanocrystals Cd/Cu ratio allowed us to obtain low-temperature solution-processed materials with ZT values up to 0.71 at 685 K. AU - Ibáñez, Maria AU - Cadavid, Doris AU - Zamani, Reza AU - García Castelló, Nuria AU - Izquierdo Roca, Victora AU - Li, Wenhua AU - Fairbrother, Andrew AU - Prades, Joan AU - Shavel, Alexey AU - Arbiol, Jordi AU - Pérez Rodríguez, Alejandro AU - Morante, Joan AU - Cabot, Andreu ID - 339 IS - 3 JF - Chemistry of Materials TI - Composition control and thermoelectric properties of quaternary chalcogenide nanocrystals: The case of stannite Cu2CdSnSe4 VL - 24 ER -