Top > Search of International Patents > LIGHT ABSORBING BODY, BOLOMETER, INFRARED RAY ABSORBING BODY, SOLAR THERMAL POWER GENERATING DEVICE, RADIANT COOLING FILM, AND METHOD FOR MANUFACTURING LIGHT ABSORBING BODY

LIGHT ABSORBING BODY, BOLOMETER, INFRARED RAY ABSORBING BODY, SOLAR THERMAL POWER GENERATING DEVICE, RADIANT COOLING FILM, AND METHOD FOR MANUFACTURING LIGHT ABSORBING BODY meetings

Foreign code F180009484
File No. 08607
Posted date Oct 2, 2018
Country WIPO
International application number 2017JP030403
International publication number WO 2018043298
Date of international filing Aug 24, 2017
Date of international publication Mar 8, 2018
Priority data
  • P2016-169692 (Aug 31, 2016) JP
Title LIGHT ABSORBING BODY, BOLOMETER, INFRARED RAY ABSORBING BODY, SOLAR THERMAL POWER GENERATING DEVICE, RADIANT COOLING FILM, AND METHOD FOR MANUFACTURING LIGHT ABSORBING BODY meetings
Abstract In order to achieve a light absorbing body wherein the wavelengths absorbed can be adjusted, an embodiment of the present invention provides a light absorbing body 100 provided with a group of dielectric protrusions 102, a conductive thin film 104, and a conductive thick film 108. The group of dielectric protrusions has each dielectric protrusion protruding at a random position on a dielectric surface. A dielectric thin film is disposed on at least part of the surface of the dielectric protrusions or above the same and on at least part of the dielectric surface where the dielectric protrusions are not present or above the same, and the dielectric thick film spreads out along the dielectric surface separate from the dielectric thin film. The group of dielectric protrusions can be achieved by disposition of dielectric particles in random positions within the surface. The present invention also provides a bolometer, an infrared ray absorbing body, a solar thermal power generating device, and a radiant cooling film using the light absorbing body above as well as a method for manufacturing the light absorbing body.
Outline of related art and contending technology BACKGROUND ART
Visible light or infrared rays are handled as the center wavelength in the optical field of the electromagnetic wave (hereinafter referred to as' light 'or' light ') is, for a variety of applications to be utilized for absorption. Good light absorption characteristics in a wide wavelength range or, the rate of absorption for each wavelength of light or to adjust the value of the object with respect to the absorption ('light absorption') is designed, and is applicable to a wide variety of applications to be very useful. For example for thermal bolometer detection apparatus, such as an alternative to the absorbent material of the current gold black light absorber is demanded. In the solar cell, sunlight as the 300nm - 2500nm wide wavelength range of light absorbed by the active layer can be improved to a large performance can be expected. Efficiently absorbs the solar power generation using solar heat as long as it can be used. Further absorption wavelength range can be controlled properly also in another application the technology been desired earnestly. Absorbs the infrared region of the solar-ray absorbing glass, heat ray shielding function and light transmittance to achieve a function, such as visible light transmitting property such as ordinary glass has a function of the energy while cooling can be saved. And the window region of the atmosphere at a high absorption wavelength band is the absorber, the absorption rate becomes the same as the emissivity from the Kirchhoff's law, a space efficient release of thermal energy radiation of the cooling device and also as a radiator. In this way good absorption properties in a wide wavelength region is achieved, and further artificially adjust the wavelength range can be expected to be used in a wide variety of applications.
May typically have a light absorption of the pigment or dye and, they are, and an electron energy level difference between the levels of the vibration energy of the binding and used to absorb light of a specific wavelength. Therefore, the absorption wavelength range in a desired range depending on the chemical structure for the wavelength region absorbed by the material that needs to be designed. In the pigment or dye, the absorption wavelength region while suppressing the absorption in the wavelength region of another strong and transparent for such a design is often difficult. Further, the pigment or dye has a problem in the durability at the time of long-term use in some cases.
On the other hand, due to the surface plasmon absorption, surface plasmon is supported on the design of the structure of the bandwidth is adjustable by, and high durability can be expected. These properties are also important applications, for example for organic solar cells due to the surface plasmon absorption by incorporating, in a wide wavelength range can be used for power generation efficiency can be expected to improve (plasmonic solar cell). In this way, the normal solar cell is employed instead of the ITO transparent electrode surface plasmon having a plasmonic structure is supported on the plasmonic electrodes are used, which is supported by the enhanced light absorption by the surface plasmon, the photoelectric conversion efficiency can be improved. Further suitable electrode structure according to the enhanced light absorption is the incidence angle dependence, polarization dependence which shows very little.
The background in terms of light absorption by the surface plasmon and various proposals have been made, for example, in Non-Patent Document 1(K. Aydin et al., Nat. Commun. 2, 517 (2011)), periodically deformed in the hole opened in the thin silver film and silver thin film in a flat thickness of the transparent dielectric is interposed between the metal-dielectric-metal (MIM) structure has been disclosed is a light absorber. Non-Patent Document is 2(M. K. Hedayati et al., Adv. Mater. 23, 5410 (2011)), gold nanoparticles mixed in the silica layer and a flat thick gold film is interposed between the transparent dielectric optical absorber in the MIM structure has been disclosed. Non-Patent Document is 3(C. Ng et al., ACS Nano 10, 4704 (2016)), gold nanoparticles formed by aggregating a flat thick gold thin film in a layer sandwiched between a transparent dielectric optical absorber in the MIM structure has been disclosed.
Scope of claims (In Japanese)請求の範囲
[請求項1]
 ある誘電体表面に沿うランダムな位置において各誘電体凸部が該誘電体表面から突出している誘電体凸部の群と、
 該群に含まれる各誘電体凸部の表面のうちの少なくとも一部の上またはその上方と該誘電体表面のうち誘電体凸部が存在しない部分のうちの少なくとも一部の上またはその上方とに配置されている導電性薄膜と、
 該導電性薄膜から離れ前記誘電体表面に沿って広がる導電性厚膜と
 を備える光吸収体。
[請求項2]
 前記誘電体凸部の群が、前記誘電体表面に接して各誘電体粒子を面内でランダムに配置したものであり、
 前記導電性薄膜は、該群に含まれる各誘電体粒子の表面のうち各誘電体粒子からみて前記誘電体表面側とは逆に向かう側の領域のうちの少なくとも一部の上または上方と該誘電体表面の誘電体粒子が配置されていない部分のうちの少なくとも一部の上またはその上方とに配置されているものである、請求項1に記載の光吸収体。
[請求項3]
 前記誘電体表面に沿って広がり前記導電性薄膜を覆う誘電体埋込層をさらに備え、
 前記導電性厚膜が、該誘電体埋込層からみて前記導電性薄膜とは逆の側の面の上または上方に配置されているものである、請求項1または請求項2に記載の光吸収体。
[請求項4]
 前記誘電体表面となる一の表面および他の表面で厚みをなす誘電体膜をさらに備え、
 前記誘電体凸部の群が、該一の表面の側に位置しており、
 前記導電性薄膜が各誘電体凸部の上または上方に配置されており、
 前記導電性厚膜が前記誘電体膜の前記他の表面の側に配置されているものである、請求項1または請求項2に記載の光吸収体。
[請求項5]
 前記導電性薄膜が、金、銀、アルミニウム、酸化物半導体、有機導電体からなる群から選択される一の材質を含むものである、請求項1または請求項2に記載の光吸収体。
[請求項6]
 前記導電性薄膜が銀を含み厚みが10nm以上50nm以下である請求項6に記載の光吸収体。
[請求項7]
 前記導電性厚膜が、金、銀、アルミニウム、酸化物半導体、有機導電体からなる群から選択される一の材質を含むものである、請求項1または請求項2に記載の光吸収体。
[請求項8]
 光吸収体の吸収するべき波長域に応じ前記導電性厚膜と前記誘電体表面との間の光学距離が調整されている、請求項1または請求項2に記載の光吸収体。
[請求項9]
 前記導電性厚膜および前記導電性薄膜のうち、前記導電性薄膜が吸収すべき光波の入射側となるように向けられている、請求項1または請求項2に記載の光吸収体。
[請求項10]
 請求項1~9のいずれか1項に記載の光吸収体を用いるボロメーター。
[請求項11]
 請求項1~9のいずれか1項に記載の光吸収体を用いる赤外線吸収体。
[請求項12]
 請求項1~9のいずれか1項に記載の光吸収体を用いる太陽熱発電装置。
[請求項13]
 請求項1~9のいずれか1項に記載の光吸収体を用いる放射冷却フィルム。
[請求項14]
 ある誘電体表面に沿うランダムな位置において各誘電体凸部が該誘電体表面から突出している誘電体凸部の群を形成するステップと、
 該群に含まれる各誘電体凸部の表面のうちの少なくとも一部の上またはその上方と該誘電体表面のうち誘電体凸部が存在しない部分のうちの少なくとも一部の上またはその上方とに導電性薄膜を配置するステップと、
 該導電性薄膜から離れ前記誘電体表面に沿って広がる導電性厚膜を形成するステップと
 を含む光吸収体の製造方法。
[請求項15]
 前記誘電体凸部の群を形成するステップが、前記誘電体表面に接して各誘電体粒子を面内でランダムに配置するステップを含み、
 前記導電性薄膜を配置するステップは、該群に含まれる各誘電体粒子の表面のうち各誘電体粒子からみて前記二次元面側とは逆に向かう側の領域のうちの少なくとも一部の上またはその上方と該誘電体表面の誘電体粒子が配置されていない部分のうちの少なくとも一部の上またはその上方とに導電性薄膜を配置するステップである、請求項14に記載の光吸収体の製造方法。
[請求項16]
 前記誘電体凸部の群を形成するステップが、前記誘電体粒子の分散液を前記誘電体表面に接触させることにより面内でランダムに配置された各誘電体粒子を前記誘電体表面に定着させるステップを含んでいる、請求項15に記載の光吸収体の製造方法。
[請求項17]
 前記誘電体粒子の分散液が、吸収係数または消衰係数における基準値が得られるよりも高い濃度に調整されている、請求項16に記載の光吸収体の製造方法。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • RIKEN
  • Inventor
  • TAKATORI, Kentaro
  • OKAMOTO, Takayuki
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG

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