# Fileset

[ISPSA_Abstract_ishii24.pdf](https://mdr.nims.go.jp/filesets/d47fd8a0-f098-4280-8f8b-0a63d703f498/download)

## Creator

[Satoshi Ishii](https://orcid.org/0000-0003-0731-8428)

## Rights

[In Copyright](http://rightsstatements.org/vocab/InC/1.0/)

## Other metadata

[Daytime Radiative Coolers and Their Applications to Thermoelectric Generation](https://mdr.nims.go.jp/datasets/c02487f5-b002-4bc3-a47a-27fbf89ef878)

## Fulltext

Simultaneous harvesting of radiative cooling and solar heating for thermoelectric generation  S. Ishii1,2 1 Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan 2Subprogram in Materials Science and Engineering, Graduate School of Science and Technology, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan *Email: sishii@nims.go.jp  Radiative cooling in outdoor is a passive method to cool the surface facing the sky. Particularly during the past decade, numbers of successful demonstrations on daytime radiative coolers have been reported. As a daytime radiative cooler can be radiatively cooled not only in day but also in in night, it is always cooled and generates temperature difference against the surrounding temperature. This temperature difference can be used to generate thermoelectric power whole day by placing a daytime radiative cooler on a thermoelectric module.[1] However, with this design, a daytime radiative cooler is not using solar energy as it reflects back to the sky. With an advanced design, a thermoelectric device can simultaneously harvest radiative cooling and solar heating. The key component is a vertically placed transparent thermoelectric module made of thin films. By sandwiching the transparent thermoelectric module by a transparent plate at the top and a black plate at the bottom, the device is capable of harvesting radiative cooling and solar heat simultaneously in day and harvesting radiative cooling in night confirmed by outdoor and indoor measurements. Our device can be an efficient method to judiciously harvest solar heating and radiative cooling simultaneously, paving the way for efficient energy harvesters which can be used as stand-alone power supplies for off-gird sensor modules.   Fig. 1. Schematic of the device which has a solar-transparent radiative cooler at the top, a transparent thermoelectric module in the middle, and a blackbody-painted plate at the bottom.   This work was partially supported by JST PRESTO (JPMJPR19I2), JST FOREST (JPMJFR2139), and Kakenhi from JSPS (22H01917), Japan.  References [1] S. Ishii, T.D. Dao, T. Nagao, Appl. Phys. Lett. 117, 013901 (2020). mailto:sishii@nims.go.jp