ITO的热辐射性质与等离子波长关系的实验研究

Experimental Study on the Relation between the Thermal Radiative Properties and Plasma Wavelength of ITO Films for Heat Mirror Applications

热镜膜具有广泛的应用背景；特别是将其沉积在柔性的黑色底衬上，就能获得不同于通常的、必须用发射率很低的金属做衬底的太阳能选择性吸收表面．采用衬底不加温的普通ＲＦ溅射技术制备单层ＩＴＯ热镜膜，并对它们的热辐射性质与等离子波长之间的关系进行了实验研究．研究表明，对于单层ＩＴＯ热镜膜，同时具有最小的发射率和最小的对太阳辐射的反射率是困难的．但是，等离子波长可以作为预测太阳能热利用领域使用的单层ＩＴＯ热镜膜热辐射性质的一个判据．

There is an increasing interest for the heat mirror films, especially, deposited on rigid or flexible black substrates used as a spectral selective absorbing coating which differs from the common selective absorber needing a metal substrate with low emissivity. The single layer indium tin oxides heat mirror films (HMF) were deposited onto unheated glass and rigid or flexible plastic substrates by conventional RF sputtering technique. The relation between the thermal radiative properties and the plasma wavelength of indium tin oxides heat mirror films were obtained based on experimental studies. The results show that it is impossible to get ITO HMF simultaneously with maximum reflectance in thermal long wavelength region and minimum reflectance in the solar spectral region. However, the plasma wavelength can be take as a criterion to predict the thermal radiative properties of ITO HMF, approximately.