Simultaneous harvesting of radiative cooling and solar heating for transverse thermoelectric generation

Satoshi Ishii, Asuka Miura, Tadaaki Nagao, Ken ichi Uchida

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


For any thermoelectric effects to be achieved, a thermoelectric material must have hot and cold sides. Typically, the hot side can be easily obtained by excess heat. However, the passive cooling method is often limited to convective heat transfer to the surroundings. Since thermoelectric voltage is proportional to the temperature difference between the hot and cold sides, efficient passive cooling to increase the temperature gradient is of critical importance. Here, we report simultaneous harvesting of radiative cooling at the top and solar heating at the bottom to enhance the temperature gradient for a transverse thermoelectric effect which generates thermoelectric voltage perpendicular to the temperature gradient. We demonstrate this concept by using the spin Seebeck effect and confirm that the spin Seebeck device shows the highest thermoelectric voltage when both radiative cooling and solar heating are utilized. Furthermore, the device generates thermoelectric voltage even at night through radiative cooling which enables continuous energy harvesting throughout a day. Planar geometry and scalable fabrication process are advantageous for energy harvesting applications.

Original languageEnglish
Pages (from-to)441-448
Number of pages8
JournalScience and Technology of Advanced Materials
Issue number1
Publication statusPublished - 2021


  • 203 Magnetics / Spintronics / Superconductors
  • 204 Optics / Optical applications
  • 206 Energy conversion / transport / storage / recovery
  • 210 Thermoelectronics / Thermal transport / insulators
  • 40 Optical, magnetic and electronic device materials
  • energy harvesting
  • radiative cooling
  • solar heat
  • Spin Seebeck effect
  • thermoelectric effect


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