Formation of photo-thermoelectric energy conversion functional films by controlling film structure in nanometer scale.

通过纳米尺度控制薄膜结构形成光热电能量转换功能薄膜。

基本信息

批准号：
10650649
负责人：
ISHIGURO Takashi
金额：
$ 2.18万
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：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

In order to exploit solar energy resources, the photo-thermoelectric energy conversion functional films have been investigated. The subject has been composed of two functional parts, I.e., (1) : photo-thermal energy conversion films and (2) : thermoelectric energy conversion films. The aim of the investigation is to improve individual function by forming the suitable mesoscopic structure in the films.(1) Ag/MgO and/or W-N/AlN multi-layer sutuctured films are formed by the sputtering method. With increasing Ag layer thickness, the optical properties change from the surface-plasmon absorption due to fine particle into bulk metallic property via conductive absorption which shows relatively large absorbance in the near infrared region as well as visible light region. The functionally graded Ag/MgO film is formed based on the above results. Then the total solar energy absorbance of 87% is achieved. The same procedure is performed on the W-N/AlN system. The finally obtained functionally graded W-N/AlN film shows a total solar energy absorbance of 93%.(2) Sputtered Fe-Si films are annealed (853K x 2h) in a vacuum. The change of the electrical resistivity (ρ) and the Seebeck coefficient (α) are measured. The film with a composition of FeSiィイD22ィエD2 shows maximum values of ρ and α. The multi-layered FeSiィイD22ィエD2/C films are formed. The value of ρ is successfully reduced but the α is also reduced. The power factor is not improved consequently. The sputtered Co-Sb films are also formed. By annealing, the amorphous-structured films change into polycrystalline structure including high-density voids with nanometer size. Such a nano-void structure may contribute to the reduction of thermal conductivity.It has been presented in this research that the introduction of the suitable mesoscopic structures into the intrinsic film structure is effective to improve the inherent function. The performing the optimization will be a future problem.

为了利用太阳能资源，已经对光电函数膜进行了摄影。投资是通过在薄膜中形成合适的介质结构，由ALN多层缝合膜形成，由溅射方法形成，而Ag层厚度增加。金属通过在近红外区域以及可见的光区域中的相对吸收性。 93％的太阳能吸收率（2个溅射的Fe-Si膜被消除（853K x 2H）。显示ρ和α的最大值退火，无定形结构的膜变为多晶结构，包括具有仪表大小的空隙。合适的介质结构内在膜结构是改善E优化的功能。