被动冷却辅助下太阳能电池性能的理论分析

Passive cooling strategies, such as radiative cooling and evaporation cooling, have attracted lots of interest in the heat dissipation of solar cells. However, how to evaluate the effect of these passive cooling strategies on the solar cell performance was lacking, which is critical for the passive cooling design of solar cells. In this work, an electricity-thermal model was built to discuss the solar cell performance under different passive cooling conditions. Compared with the common solar cell with a glass cover, the sky radiative cooling by improving mid-infrared thermal emittance or above-λg (effective cutoff wavelength) reflectance in the solar spectrum had a slight effect on the temperature drop or power improvement under natural convection. The core point was to ensure the near-perfect sub-λg transmittance using anti-reflection coatings, which played the main role in the solar cell performance. A low cell temperature did not mean a high cell outpower under the selective spectra