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Ultra-low Thermal Conductivity In All-Inorganic Halide Perovskites

All-inorganic halide perovskite nanowires by facile low-temperature processes uniquely exhibit ultralow thermal conductivity.

Scientific Achievement
Discovered ultralow thermal conductivity (~0.4 W/m∙K), comparable to their amorphous limit in single-crystalline all-inorganic halide perovskite nanowires and attributed it to a cluster rattling mechanism.

Significance and Impact
Opens up opportunities for energy conversion applications and calls attention to the thermal management strategies for applications with all-inorganic halide perovskites.

Research Details

  • Single-crystalline all-inorganic halide perovskite nanowires synthesized by facile low-temperature solution processes show ultralow thermal conductivity regardless of different phases and compositions.
  • Black-phase CsSnI3 shows a rare combination of ultralow thermal conductivity and high electrical conductivity, resulting in ZT of 0.11 around room temperature.

W. Lee, H. Li, A.B. Wong, D. Zhang, M. Lai, Y. Yu, Q. Kong, E. Lin, J.J. Urban, J.C. Grossman, P. Yang, PNAS (2017) DOI: 10.1073/pnas.1711744114