Development of Selective Solar Absorber Coating by・ Stratified Integration of Mesoscopic Structures

通过介观结构的分层集成开发选择性太阳能吸收涂层

• 批准号: 14550651
• 负责人: ISHIGURO Takashi
• 金额: $ 1.98万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550651/
• 关键词: solar absorber coating; functional graded structure; rough surface; mesoscopic structure; ultra-fine particles; energy conversion film; probe microscopy; solar selectivity; 凹凸表面; solar absorber coating; functional graded structure; rough surface; mesoscopic structure; ultra-fine particles; energy conversion film; probe microscopy; solar selectivity; 凹凸表面

It is the time to promote the energy shift from fossil fuel to natural alternative energy resources. The photothermal energy conversion is one of the solutions. Surfaces of this kind of solar absorber coating require a high solar absorptance (α) and a concomitant low thermal emittance (ε), i.e., solar selectivity. In order to improve photothermal energy conversion efficiency (η), the mesoscopic structure such as nano-particles and rough surface are especially concerned in this study.First of all, optical properties and thermal stability of the nano-structured Ag are evaluated. Based on the result, the high performance of photothermal conversion (η=0.72 at 373K for AM1.5 and ultimate temperature of 550K) is successfully realized.We recently developed a solar absorber coating with high a induced by surface roughness. This is the Al-N film prepared by reactive rf sputtering. We clarified that one of the reasons for the high a is the gradient-refractive index caused by the surface roughness. Unfortunately, the t was rather high and this should be improved.Therefore, in this study, a solar selective absorber coating with surface roughness is fabricated. First, the Al film with proper surface roughness, the degree of which is prepared by a method of two-step deposition of an Al layer at two different substrate temperatures, is prepared as an infrared reflector, which contributes to the low e. Then the Al-N film as an absorber layer is deposited on this Al reflector. In addition, a transparent AlN film is examined for use as an anti-reflector in the solar selective absorber with surface roughness. As the result, high performance of α=0.92(AM1.5),ε=0.06(373K), and then η=0.86 have been realized.As the other method, the courting by the Sn doped indium oxide (ITO) film on the AI-N film was examined. By the deposition of ITO film at 298K followed by the annealing at 773K, the emittance could be successfully suppressed.

现在是时候促进从化石燃料到天然替代能源资源的能源转移了。光热能转换是解决方案之一。这种太阳吸收器涂层的表面需要高太阳吸光度（α）和伴随的低热绝缘（ε），即太阳选择性。为了提高光热能量转化效率（η），在这项研究中尤其关注纳米颗粒和粗糙表面等介观结构。首先，评估了纳米结构化AG的光学特性和热稳定性。基于结果，成功实现了光热转化率（AM1.5的η= 0.72，在373K时为373K，最终温度为550k）。我们最近开发了一种由表面粗糙度引起的高度诱导的太阳能吸收剂涂层。这是通过反应性RF溅射制备的Al-N膜。我们澄清说，高A的原因之一是由表面粗糙度引起的梯度反向指数。不幸的是，T很高，应改进。因此，在这项研究中，制造了带有表面粗糙度的太阳能选择性吸收涂层。首先，具有适当表面粗糙度的Al膜，其程度是通过在两个不同的底物温度下的Al层的两步沉积的方法制备的，作为红外反射器制备，这有助于低E。然后将Al-N膜作为吸收层沉积在此AL反射器上。此外，检查了透明的ALN膜在具有表面粗糙度的太阳能选择性吸收器中用作抗反应器。结果，已经实现了α= 0.92（AM1.5），ε= 0.06（373K），然后实现η= 0.86的高性能。另一种方法，检查了AI-N膜上SN掺杂的内部氧化物（ITO）膜的求求。通过298K ITO膜的沉积，然后在773K处退火，可以成功抑制排放。