Abstract
Daytime and nighttime radiative cooling is possible if a surface has high solar reflectivity and high
mid-infrared emissivity. While the main focus of radiative cooling is to achieve cooler surfaces, radiative
cooling can be used to generate temperature difference against ambient temperature. In this review,
we review our recent work where a combination of radiative cooler and a thermoelectric module can be
an energy harvester. The unique feature of the device is that it can generate voltage whole day continuously
which is quite challenging with other techniques. By further improving the output power, it is anticipated
that the device can be used to self-power off-grid sensors.
