On the metallic states in highly conducting iodine-doped polyacetylene

Thermoelectric plastics: from design to synthesis, processing and structure–property relationships

“…As early as 1990, Nogami et al studied uniaxially aligned iodine-doped polyacetylene. 8 A very high σ ∼ 60 000 S cm –1 and α ∼ 15 μV K –1 gave rise to a power factor of about 1350 μW m –1 K –2 (Table 1), which is until today one of the best results for an (albeit poorly stable) organic thermoelectric material. Mateeva et al measured the σ and α of stretch-aligned polyaniline and polypyrrole and found that for the same Seebeck coefficient the electrical conductivity was two orders of magnitude higher along the direction of orientation.…”

“…The best results were achieved with iodine-doped, stretch-aligned polyacetylene, 8 which is highly conductive leading to a very high power factor of up to 1350 μW m –1 K –2 (Table 1) but suffers from poor environmental stability. Other materials such as camphorsulfonic acid (CSA) doped, stretch-aligned polyaniline, which offers very good environmental stability, were found to display much lower power factors of up to 5 μW m –1 K –2 .…”

Solution-Processable Molecular and Polymer Semiconductors for Thermoelectrics

“…These methods can increase conductivity over 11 orders of magnitude from the pristine polymer, approaching, and exceeding 1,000 Scm −1 depending on the dopant chosen, allowing calculated power factors (PFs) that are competitive for applications. [50][51][52][53][54] One of the highest calculated PFs reported is 1.2 mWm −1 K −2 for iodine-doped stretchaligned polyacetylene. 52 However, this method of doping requires a constant overpressure of iodine vapor, as de-doping occurs rapidly upon the removal of the dopant vapor, limiting the usefulness for applications.…”

“…[50][51][52][53][54] One of the highest calculated PFs reported is 1.2 mWm −1 K −2 for iodine-doped stretchaligned polyacetylene. 52 However, this method of doping requires a constant overpressure of iodine vapor, as de-doping occurs rapidly upon the removal of the dopant vapor, limiting the usefulness for applications. Percent doping, from which carrier concentration is inferred, and determined by electron spin resonance (ESR), elemental analysis, or mass increases upon doping.…”

Thermoelectric Transport in Nanocomposites

“…For example, a ZT value of ~0.38 has been reported for iodine-doped polyacytelene [123] and the value is 0.25 in poly(3,4-ethylenedioxythiophene) (PEDOT) [124]. The TE properties in nanostructured organic materials such as organic films [125], chain-like polymer structures [126], organic hybrid materials [127], and self-assembled molecular nanowires that are composed of one-dimensional (1D) stacks of planar building blocks loosely held together [128] have been studied experimentally. There are not many theoretical works for potentially high-efficiency organic TE materials.…”