Wavelength-tunable mid-infrared thermal emitters with a non-volatile phase changing material
Wavelength-tunable mid-infrared thermal emitters with a non-volatile phase changing material
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DOI：
10.1039/c7nr09672k
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发表时间：
2018-03-07
期刊：
影响因子：
6.7
通讯作者：
Li, Qiang
中科院分区：
文献类型：
--
作者：
Du, Kaikai;Cai, Lu;Li, Qiang
在保持高峰发射率的同时连续调谐中红外热发射器的发射波长的能力仍然是一个挑战。通过引入非易失性相变材料Ge_2Sb_2 Te_5（GST），设计了两种基于简单层状结构（GST-Al双层和Cr-GST-Au三层）的波长可调谐中红外热发射器。为了在波长可调的情况下获得高峰发射率，分别采用了Al膜和Cr膜（厚度约为5 nm）两种结构。GST的逐渐相变提供了在7 μ m和13 μ m之间的可调谐峰值波长，同时保持了高峰发射率（对于GST-Al和Cr-GST-Au发射体，分别>0.75和>0.63）。这项研究表明，控制的热发射波长的能力，其应用可能会扩展到气体传感器，红外成像，太阳能热光电转换，和辐射冷却器。
The ability to continuously tune the emission wavelength of mid-infrared thermal emitters while maintaining high peak emissivity remains a challenge. By incorporating the nonvolatile phase changing material Ge2Sb2Te5 (GST), two different kinds of wavelength-tunable mid-infrared thermal emitters based on simple layered structures (GST-Al bilayer and Cr-GST-Au trilayer) are demonstrated. Aiming at high peak emissivity at a tunable wavelength, an Al film and an ultrathin (approximate to 5 nm) top Cr film are adopted for these two structures, respectively. The gradual phase transition of GST provides a tunable peak wavelength between 7 m and 13 m while high peak emissivity (>0.75 and >0.63 for the GST-Al and Cr-GST-Au emitters, respectively) is maintained. This study shows the capability of controlling the thermal emission wavelength, the application of which may be extended to gas sensors, infrared imaging, solar thermophotovoltaics, and radiative coolers.