Improvement in Systematized Photo-thermoelectric Energy Conversion Film by Controlling Mesoscopic Film Structure

通过控制介观薄膜结构改进系统化光热电能量转换薄膜

基本信息

批准号：
12650658
负责人：
ISHIGURO Takashi
金额：
$ 2.69万
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：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650658/
关键词：
solar absorber coating functional graded structure thermoelectric materials mesoscopic structure Seebeck coefficient energy conversion film ultra thin film infrared ray

项目摘要

In order to improve the performance of systematized photo-thermoelectric energy conversion film, individual functional components, i.e., photo-thermal conversion film and thermoelectric conversion film, are studied in the sense of controlling their mesoscopic structure.As a photo-thermal energy conversion film, nano-structured Ag layers sandwiched between MgO layers are formed. The morphology of Ag layer changes systematically from the dispersed nano-particles to the continuous film via the intermediate nano-structures, i.e., the insular film or the maze-cracked film. It is found that the Ag films with these intermediate nano-structures have the effective optical properties applying to the solar absorber coating, i.e., the large absorptance at both visible and near infrared regions and the thermal stability. Based on the results obtained about the nano-structured Ag layers, a thermally stable selective solar absorber coating with the functional graded structure is successfully fabricat … More ed. Then the photo-thermal energy conversion efficiency of 0.72 for air mass one (AM1), 0.66 for AM1.5, and 0.59 for AM2 are realized at a typical operating temperature of 373K. Al-N films are also formed by rf sputtering using Ar and N_2 gas mixture. The concentration of partial N_2 gas pressure (C_<N2>) is changed. The specimen with 7.3%N_2 of C_<N2> shows the highest solar energy absorptance (α) of 0.95 for the air mass one. The reason for the high value of α is the antireflection effect due to the gradient-refractive index caused by the enhanced surface roughness during film growth.In a promising thermoelectric material of CoSb_3, the problem is to reduce the thermal conductivity due to lattice. A possibility to form the porous morphology by using Co-Sb-N ternary system is examined. High density of vacancy with a scale of nanometer due to sublimation of N and/or Sb is successively formed. As a result, it may be mentioned that the formation of Co-Sb-N ternary film and following annealing is one of the noble methods to control the porous morphology of the film.In order to evaluate thermal diffusivity of the film, the AC calorimetric method by using infrared camera instead of thermocouple is examined. This method is applied to the measurement of thermal diffusivuty of SUS304. Then the usefulness of the noncontact temperature measurement method is confirmed. Less

为了改善Thoto-thermoelectric conversion膜，单个功能成分倾向膜和控制其介观结构的热电膜。作为光末期，MGO层之间的纳米结构化老化是从系统形成的。通过中间的纳米结构，即岛上的胶片或迷宫裂纹的膜。红外区域和热稳定性。 AM2的0.59在373K的典型工作温度下也通过RF溅射AR和N_2气体混合物形成。 N2>显示空气质量的最高太阳能吸收率（α）为0.95。 COSB_3的材料是使用Co-SB-N三元系统的晶格导致的热度。 co-sb-n三元膜的形成是控制膜的多孔形态的一种贵族方法。在评估膜的热扩散性中，将其用于SUS304的热扩散的测量。确认非接触温度测量方法