Ultrahigh Thermoelectric Power Factor in Flexible Hybrid Inorganic-Organic Superlattice: Article No. 1024

Ronggui Yang, Chunlei Wan, Ruoming Tian, Mami Kondou, Pengan Zong, Kunihito Koumoto

Research output: Contribution to journalArticlepeer-review

146 Scopus Citations

Abstract

Hybrid inorganic-organic superlattice with an electron-transmitting but phonon-blocking structure has emerged as a promising flexible thin film thermoelectric material. However, the substantial challenge in optimizing carrier concentration without disrupting the superlattice structure prevents further improvement of the thermoelectric performance. Here we demonstrate a strategy for carrier optimization in a hybrid inorganic-organic superlattice of TiS2[tetrabutylammonium] x [hexylammonium] y, where the organic layers are composed of a random mixture of tetrabutylammonium and hexylammonium molecules. By vacuum heating the hybrid materials at an intermediate temperature, the hexylammonium molecules with a lower boiling point are selectively de-intercalated, which reduces the electron density due to the requirement of electroneutrality. The tetrabutylammonium molecules with a higher boiling point remain to support and stabilize the superlattice structure. The carrier concentration can thus be effectively reduced, resulting in a remarkably high power factor of 904 uW m-1 K-2 at 300 K for flexible thermoelectrics, approaching the values achieved in conventional inorganic semiconductors.
Original languageAmerican English
Number of pages9
JournalNature Communications
Volume8
DOIs
StatePublished - 2017

NREL Publication Number

  • NREL/JA-5500-70434

Keywords

  • organic-inorganic nanostructures
  • thermoelectrics
  • two-dimensional materials

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