Black body-like radiative cooling for flexible thin-film solar cells
Black body-like radiative cooling for flexible thin-film solar cells
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DOI：
10.1016/j.solmat.2019.02.015
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发表时间：
2019-06-01
影响因子：
6.9
通讯作者：
Luo, Tengfei
中科院分区：
文献类型：
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作者：
Lee, Eungkyu;Luo, Tengfei
阳光照射和自热导致的温度升高可能对太阳能电池的性能和可靠性有害。在这项工作中，我们通过理论计算确定，化学性质稳定且价格低廉的聚二甲基硅氧烷（PDMS）可以成为冷却柔性薄膜太阳能电池的一种高效热辐射体。研究表明，200微米厚的平面PDMS层在4 - 26微米的整个红外波段能够实现高于0.9的高发射率。通过在8 - 13微米范围内的表面引入金字塔结构（在此范围内环境辐射可忽略不计），发射率可进一步提高到接近1。根据计算出的辐射冷却速率和实际的功率转换效率，我们表明金字塔结构的PDMS层可分别将有机、钙钛矿和微晶（μc）-Si柔性太阳能电池的温度显著降低11℃、12℃和16℃。这项工作可能为高性能且可靠的柔性太阳能电池的设计提供重要指导。
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 mu m-thick planar PDMS layer is capable of achieving high emissivity over 0.9 in the whole IR regime of 4-26 mu m. The emissivity can be further increased to near-unity by introducing pyramid structures to the surface in the range of 8-13 mu m, 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 (mu c)-Si flexible solar cell by 11 degrees C, 12 C and 16 degrees C, respectively. This work may provide important guidance to the design of high performance and reliable flexible solar cells.