High-performance, air-stable, n-type thermoelectric films from a water-dispersed nickel-ethenetetrathiolate complex and ethylene glycol

Abstract

High-performance n-type thermoelectric films were fabricated via an environmentally benign process using a water-dispersed nickel-ethenetetrathiolate (Ni-ETT) and ethylene glycol.

Sequential Doping of Ladder-Type Conjugated Polymers for Thermally Stable n-Type Organic Conductors

“…Conjugated polymers have attracted a great deal of attention as a class of semiconducting materials that hold promise for the development of a wealth of traditional as well as unconventional low-cost and distributed technologies. − Their versatile chemical synthesis and inexpensive solution processability enable cost-efficient large-scale production of light, flexible, and even biocompatible electronic devices which would otherwise be difficult to realize using traditional inorganic semiconductors. − The electronic and electrical properties of π-conjugated polymers, and thus, the performance of the resulting (opto)­electronic devices, depend strongly on the charge carrier concentration, which can be tuned by the so-called electrical doping . Both p-doping and n-doping are needed to optimize various electronic devices, including organic solar cells, field-effect transistors, and thermoelectric generators. − This is typically achieved via an electron or proton/hydride transfer between the dopant molecule and the polymer backbone, a process that increases the charge carrier density and hence improves the electrical properties . Conjugated polymers and molecular dopant molecules can either be coprocessed using a common solvent or sequentially processed by exposing the polymer film to the dopant vapors − or the dopant dissolved in an orthogonal solvent. , The advantage of sequential doping over coprocessing doping is that the morphology of the doped films remains to a large extent undisturbed, thus yielding electrical conductivities that are superior to those commonly reached with coprocessing methods …”

Electrocatalytic hydrogen evolution of conducting coordination polymers based on 1,1,2,2‐ethenetetrathiolate

“…The electrical conductivity of CPs is an important element in many fields such as catalysis, thermoelectrics and transistors, etc 19–23 . The electrical conductivities of poly[K x (M‐ett)] are shown in Figure 2A.…”

“…The electrical conductivity of CPs is an important element in many fields such as catalysis, thermoelectrics and transistors, etc. [19][20][21][22][23] The electrical conductivities of poly The as-prepared poly[K x (Ni-ett)] powders present shortrange order in π-aggregates, which is conductive effect on the enhancement of electrical conductivity compared with the completely amorphous powders. One other reason is the aggregation of conjugated chains, greatly enhancing the electron transport in plane.…”

A Highly Conductive n-Type Coordination Complex with Thieno[3,2-b]thiophene Units: Facile Synthesis, Orientation, and Thermoelectric Properties

“…Nickel-ethenetetrathiolate (NiETT) is an organometallic coordination complex with a one-dimensional polyanionic conjugated system (Figure a) . Although NiETT exhibits n-type electrical conductivity without n-doping, as well as excellent stability against atmospheric oxidation, it is virtually insoluble in most common solvents.…”