Radiation‐Modulated Origami‐Based Thermoelectric Generator for Continuous Solar Energy Harvesting

Abstract Thermoelectric technology offers a promising approach to convert low‐grade heat sources, such as solar radiation, into sustainable electricity for powering low‐power electronic devices. However, challenges remain in optimizing the structure of solar thermoelectric generators and achieving large temperature gradients to improve output performance. Here, passive radiative cooling and photothermal conversion are integrated within a foldable origami‐based thermoelectric device. Through structural design, mutual optical interference between the photothermal and passive radiative cooling layers is eliminated, allowing both to simultaneously face the sun and operate synergistically. Under standard solar intensity, the device achieves a temperature gradient of 46.5 K and a power density of 4.7 W m ⁻² , outperforming previously reported solar thermoelectric generators. Finite element simulations and experimental measurements confirm its ability to deliver continuous power across a full diurnal cycle, with a peak voltage of 28.1 mV during the day and a stable output of 2.7 mV at night. This work presents a new pathway to smart building design and human sustainable development.