title: Nano-Cr-film-based solar selective absorber with high photo-thermal conversion efficiency and good thermal stability.
abstract: Optical properties and thermal stability of the solar selective absorber based on the metal/dielectric four-layer film structure were investigated in the variable temperature region. Numerical calculations were performed to simulate the spectral properties of multilayer stacks with different metal materials and film thickness. The typical four-layer film structure using the transition metal Cr as the thin solar absorbing layer [SiO(2)(90nm)/Cr(10nm)/SiO(2)(80nm)/Al (≥100nm)] was fabricated on the Si or K9 glass substrate by using the magnetron sputtering method. The results indicate that the metal/dielectric film structure has a good spectral selective property suitable for solar thermal applications with solar absorption efficiency higher than 95% in the 400-1200nm wavelength range and a very low thermal emittance in the infrared region. The solar selective absorber with the thin Cr layer has shown a good thermal stability up to the temperature of 873K under vacuum atmosphere. The experimental results are in good agreement with the calculated spectral results.
authors.affiliation: Department of Optical science & Engineering, Fudan University, Shanghai 200433, Shanghai.
authors.forename: Wei-Xi
authors.initials: WX
authors.lastname: Zhou
authors.forename: Yan
authors.initials: Y
authors.lastname: Shen
authors.forename: Er-Tao
authors.initials: ET
authors.lastname: Hu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Ming-Yu
authors.initials: MY
authors.lastname: Sheng
authors.forename: Yu-Xiang
authors.initials: YX
authors.lastname: Zheng
authors.forename: Song-You
authors.initials: SY
authors.lastname: Wang
authors.forename: Young-Pak
authors.initials: YP
authors.lastname: Lee
authors.forename: Cai-Zhuang
authors.initials: CZ
authors.lastname: Wang
authors.forename: David W
authors.initials: DW
authors.lastname: Lynch
authors.forename: Liang-Yao
authors.initials: LY
authors.lastname: Chen
mesh_terms: D000042:Absorption; D002857:Chromium / Q000737:chemistry* / Q000528:radiation effects; D004735:Energy Transfer; D008422:Materials Testing; D008567:Membranes, Artificial; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects; D012993:Solar Energy; D013696:Temperature
chemical_list: D008567:Membranes, Artificial; D002857:Chromium