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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

为了改善系统化的光-热电能量转换膜的性能，研究了光热转换膜和热电转换膜的介观结构控制问题，提出了在MgO层中夹入纳米结构Ag层作为光热转换膜的方法。Ag层的形貌从分散的纳米颗粒经过中间纳米结构系统地转变为连续的薄膜，孤立的薄膜或迷宫破裂的薄膜。研究发现，具有这些中间纳米结构的Ag膜具有应用于太阳能吸收涂层的有效光学性质，即，在可见光和近红外区都有很大的吸收率和热稳定性。在此基础上，成功制备了具有功能梯度结构的热稳定的选择性太阳能吸收涂层。 ...更多信息然后，在373 K的典型操作温度下，实现了空气质量一（AM 1）的0.72、AM 1.5的0.66和AM 2的0.59的光热能转换效率。用Ar和N_2混合气体射频溅射法制备了Al-N薄膜。改变N_2气体分压（C_）的浓度<N2>。当N_2含量为7.3%C_2<N2>时，空气质量试样的太阳能吸收率（α）最高，为0.95。高α值的原因是薄膜生长过程中表面粗糙度增加引起的梯度折射率的折射率效应。在有前途的热电材料CoSb_3中，问题是由于晶格而降低热导率。探讨了用Co-Sb-N三元系形成多孔结构的可能性。由于N和/或Sb的升华而连续形成纳米级的高密度空位。结果表明，Co-Sb-N三元薄膜的形成和随后的退火是控制薄膜多孔形貌的有效方法之一。为了评价薄膜的热扩散率，本文采用红外摄像机代替热电偶的交流量热法。将该方法应用于SUS 304材料的热扩散率测量。验证了非接触测温方法的有效性。少