Halide Perovskites as Capable Thermoelectric Materials*

Halide perovskites have emerged as a new material class in multiple energy conversions research fields such as photovoltaics, photodetection, light emission, memristor, ferroelectric, and photothermal conversion due to their exceptional combination of optoelectronic and charge carrier transport. However, the thermoelectric properties of halide perovskites have received limited attention despite their capability. Halide perovskites are classified as having phonon glass, electron crystal. They have ultralow thermal conductivity and superior Seebeck coefficient coupled with decent mobility and charge carrier tunability. However, they suffer from instability, poor electrical conductivity, and a small power factor. Among halide perovskites, Pb- and Sn-based materials have shown better thermoelectric properties to date. For future thermoelectric applications, reliable materials synthesis methods and thermoelectric property measurements are required. In this talk, we introduce perovskites as a new thermoelectric materials system and discuss research capabilities and future perspectives on these materials systems.