TY - JOUR TI - Systematic Power Factor Enhancement in n-Type NiETT/PVDF Composite Films AU - Menon, Akanksha K. AU - Wolfe, Rylan M. W. AU - Marder, Seth R. AU - Reynolds, John R. AU - Yee, Shannon K. T2 - Advanced Functional Materials AB - Nickel ethenetetrathiolate (NiETT) coordination polymers are shown to exhibit high thermoelectric performance as pressed pellets. Because the material is insoluble, films are formed by fabricating a composite of the material in an inert polymer matrix, a process that adversely impacts thermoelectric properties. To date, a reliable and reproducible synthesis has not been reported, which was the motivation for a systematic study of the substeps involved to understand the reaction mechanism. The results of these studies yield optimized reaction conditions for high performance n-type films, which are derived from empirical studies and material characterization. Herein, a reaction procedure is presented that gives reproducible properties when preparing batches in the 0.5–15 g range. The identity of the counterion, nickel equivalency, and oxidation extent are investigated, which provide insight into the synthetic reaction mechanism and the ligand-centered oxidation process in these polymers. Optimized materials based on Na[NiETT] exhibit one of the highest n-type thermoelectric performance for solution-processed films reported to date, with power factors of 23 µW (m K)−2 (due to conductivities approaching 50 S cm−1) while maintaining their stability in ambient conditions. DA - 2018/// PY - 2018 DO - https://doi.org/10.1002/adfm.201801620 DP - Wiley Online Library VL - 28 IS - 29 SP - 1801620 LA - en SN - 1616-3028 UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201801620 Y2 - 2021/05/06/20:58:19 KW - Materials KW - conducting polymers KW - ethenetetrathiolates KW - n-type KW - organic electronics KW - organic thermoelectrics KW - thermoelectrics ER -