发射率
材料科学
辐射冷却
共发射极
光电子学
辐射传输
能量转换效率
棱锥(几何)
太阳能电池
平面的
聚二甲基硅氧烷
钙钛矿(结构)
图层(电子)
工作(物理)
热的
太阳能电池效率
光学
纳米技术
化学工程
热力学
物理
计算机科学
计算机图形学(图像)
工程类
作者
Eungkyu Lee,Tengfei Luo
标识
DOI:10.1016/j.solmat.2019.02.015
摘要
Elevated temperature due to sunshine and self-heating can be detrimental to the performance and reliability of solar cells. In this work, we use theoretical calculations to identify that polydimethylsiloxane (PDMS), which is chemically stable and inexpensive, can be a highly efficient thermal emitter for cooling flexible thin-film solar cells. It is shown that a 200 µm-thick planar PDMS layer is capable of achieving high emissivity over 0.9 in the whole IR regime of 4–26 µm. The emissivity can be further increased to near-unity by introducing pyramid structures to the surface in the range of 8–13 µm, where environment radiation is negligible. According to the calculated radiative cooling rates and realistic power conversion efficiencies, we show that a pyramid-structured PDMS layer can significantly lower the temperature of an organic, a perovskite and a micro-crystalline (µc)-Si flexible solar cell by 11 °C, 12 °C and 16 °C, respectively. This work may provide important guidance to the design of high performance and reliable flexible solar cells.
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