ZT > 0.1 Electron‐Carrying Polymer Thermoelectric Composites with In Situ SnCl₂ Microstructure Growth

Abstract

An n‐type pyromellitic diimide polymer composite with in situ microstructure growth of the common element compound SnCl2 reaches power factor of 50–100 μW m−1 K−2, the highest purely n‐type polymer composite power factor yet reported. The composite has a gigantic Seebeck coefficient between −4000 and −5000 μV K−1, many times higher than other polymer composites.

Air‐tolerant Fabrication and Enhanced Thermoelectric Performance of n‐Type Single‐walled Carbon Nanotubes Encapsulating 1,1′‐Bis(diphenylphosphino)ferrocene

“…The dppf@SWNT films showed a systematic increase in the Seebeck coefficient as a function of temperature (Figure (b)), and generated 2.4×10 2 μW mK 2 of PF at 400 K (Figure (c–d)). To our best knowledge, the PF value was comparable to those of the state‐of‐the‐art n‐type CNT‐based materials and n‐type organic thermoelectric materials in the literature . It should be also noted that we found a systematic increase in the Seebeck coefficient as a function of temperature in the range of 300–400 K. Most pristine SWNTs show the saturation of thermopower in the same temperature range .…”

“…To our best knowledge,t he PF value was comparable to those of the state-of-the-artn -type CNT-basedm aterials and n-typeo rganic thermoelectric materials in the literature. [31] It should be also noted that we found as ystematic increase in the Seebeck coefficient as af unctiono ft emperature in the range of 300-400 K. Most pristine SWNTss how the saturation of thermopower in the same temperature range. [32] The similar increase has been observed for p-type doped SWNTs.…”

Thermoelectrics: From history, a window to the future

“…Lines representing a constant figure of merit zT, by taking into account the increase of κ with increasing σ according to the Wiedemann-Franz law, suggest, that a zT > 1 is more likely for n-type than p-type materials, provided that σ can be increased further. However, a possible strategy to bypass these limitations is the decoupling of the electronic and the thermal conductivity, for instance, by creating heterogeneous materials such as nanocomposites with carbon nanotubes, graphene (see Chapter IV) or inorganic nanowires [623,624] with interfaces that enhance phonon scattering. derivatives [15], purple: PEDOT [5,10,[29][30][31], green: polyacetylene [22,23]) and b) n-type materials [43][44][45][46]51,53,54,56,57] extracted from literature.…”

Recent advances in rylene diimide polymer acceptors for all-polymer solar cells

“…Pyromellitic diimide (PMDI) has a smallest aromatic core, whose polymers should maintain the low-lying LUMO levels but suffer from challenging polymerization and backbone torsion due to the steric hindrance between the adjacent units. Although n-type PMDI-based polymers with alkyne units in the main chains, which could attenuate the hindrance through the polymer backbone, have been successfully prepared as field-effect transistor and thermoelectric materials [31,32], their uses as the acceptor species in aPSCs are to date not presented yet. 1,2,5,6-Naphthalene diimide, an isomer of 1,4,5,8-NDI, coronene diimide derived from PDI by fused two aromatic rings to the bay positions, as well as some other NDI-fused derivatives are also developed for polymer acceptors in aPSC.…”