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Coatings for solar cell|4 Article(s)
Scattering properties of ZnO gratings on Al back reflectors for thin f ilm silicon solar cells
Renchen Liu, Yonggang Wu, Guangde Tong, and Zihuan Xia
Light scattering properties of back grating structures that composed of one-dimensional ZnO gratings and a flat 300-nm Al reflectors are investigated. Results show that grating structures cause an 8% reduction of the total reflectivity, as grating periods increasing from 620 to 1 435 nm, both the diffuse reflectivity and the haze parameter enhance drastically between 400 and 1 000 nm, whereas the diffraction angle at normal incidence reduce greatly, which agree with the values calculated from grating equation. It is concluded that rear gratings have the potential of scattering a substantial amount of incident light to specific angles and enlarging the optical path. Light scattering properties of back grating structures that composed of one-dimensional ZnO gratings and a flat 300-nm Al reflectors are investigated. Results show that grating structures cause an 8% reduction of the total reflectivity, as grating periods increasing from 620 to 1 435 nm, both the diffuse reflectivity and the haze parameter enhance drastically between 400 and 1 000 nm, whereas the diffraction angle at normal incidence reduce greatly, which agree with the values calculated from grating equation. It is concluded that rear gratings have the potential of scattering a substantial amount of incident light to specific angles and enlarging the optical path.
Chinese Optics Letters
- Publication Date: Jun. 07, 2013
- Vol. 11, Issue s1, S10504 (2013)
Light trapping enhancement with combined front metal nanoparticles and back dif fraction gratings
Zihuan Xia, Yonggang Wu, Renchen Liu, Pinglin Tang, and Zhaoming Liang
In this letter, a design with both metal nanoparticles and back diffraction gratings is put forward for enhancing the efficiency of thin film silicon solar cells. The coupling mechanism between the metal nanoparticles and silicon absorber layer, and that between the incident light and the modes of the silicon absorption layer through the grating layer are both analyzed. The interaction between the front metal nanoparticles and back gratings is analyzed, which substantially increases the light trapping by 58% compared to flat solar cell. In this letter, a design with both metal nanoparticles and back diffraction gratings is put forward for enhancing the efficiency of thin film silicon solar cells. The coupling mechanism between the metal nanoparticles and silicon absorber layer, and that between the incident light and the modes of the silicon absorption layer through the grating layer are both analyzed. The interaction between the front metal nanoparticles and back gratings is analyzed, which substantially increases the light trapping by 58% compared to flat solar cell.
Chinese Optics Letters
- Publication Date: May. 29, 2013
- Vol. 11, Issue s1, S10503 (2013)
Black Silicon nanostructures on silicon thin films prepared by reactive ion etching
Martin Steglich, Thomas Kasebier, Ingmar Hoger, Kevin Fuchsel, Andreas Tunnermann, and Ernst-Bernhard Kley
In this letter, the application of dry etching to prepare Black Silicon nanostructures on crystalline silicon thin films on glass is described. The utilized reactive ion etching with an inductively coupled plasma (ICP-RIE) of SF6 and O2 is discussed and a remarkable increase in light absorption of about 70% is demonstrated. In this letter, the application of dry etching to prepare Black Silicon nanostructures on crystalline silicon thin films on glass is described. The utilized reactive ion etching with an inductively coupled plasma (ICP-RIE) of SF6 and O2 is discussed and a remarkable increase in light absorption of about 70% is demonstrated.
Chinese Optics Letters
- Publication Date: Apr. 19, 2013
- Vol. 11, Issue s1, S10502 (2013)
New criterion for optimization of solar selective absorber coatings
Liqing Zheng, Fuyun Zhou), Xungang Diao, and Shuxi Zhao
We discuss a merit function F as judgment of photo-thermal conversion efficiency instead of two independent parameters: solar absorptance \alpha and thermal emittance \varepsilon. The merit function F is developed using Essential Macleod software to optimize the photo-thermal conversion efficiency of solar selective coating. Bruggeman and Maxwell-Garnett models are used to calculate the dielectric function of composite cermet film. Mo, W, V, and Pd are used as metallic component as well as infrared (IR) reflector materials, and SiO2, Al2O3, AlN, and TiO2 are used for dielectric component or antireflection (AR) layer materials. The layer structure can be described as substrate (Sub)/IR reflector/ high-metal-volume fraction (HMVF)/low-metal-volume fraction (LMVF)/AR. Results show that Mo-Al2O3, Mo-AlN, W-SiO2, W-Al2O3, VSiO2, and V-Al2O3 double-cermet coatings have high conversion efficiency which is greater than 86%. The best among above is Mo-SiO2 with \alpha =0.94, \varepsilon =0.05 at 450 oC, f= 89.9%. Some selective coatings with different layer thicknesses have been successfully optimized for different solar irradiations (air mass (AM0), AM1.5D, and AM1.5G spectra) and different operating temperatures (300, 450, and 600 oC), respectively. However, the optical constants for calculation are from the software, most datum are measured for bulk materials. Therefore, results are more useful to indicate the trend than the exact values. We discuss a merit function F as judgment of photo-thermal conversion efficiency instead of two independent parameters: solar absorptance \alpha and thermal emittance \varepsilon. The merit function F is developed using Essential Macleod software to optimize the photo-thermal conversion efficiency of solar selective coating. Bruggeman and Maxwell-Garnett models are used to calculate the dielectric function of composite cermet film. Mo, W, V, and Pd are used as metallic component as well as infrared (IR) reflector materials, and SiO2, Al2O3, AlN, and TiO2 are used for dielectric component or antireflection (AR) layer materials. The layer structure can be described as substrate (Sub)/IR reflector/ high-metal-volume fraction (HMVF)/low-metal-volume fraction (LMVF)/AR. Results show that Mo-Al2O3, Mo-AlN, W-SiO2, W-Al2O3, VSiO2, and V-Al2O3 double-cermet coatings have high conversion efficiency which is greater than 86%. The best among above is Mo-SiO2 with \alpha =0.94, \varepsilon =0.05 at 450 oC, f= 89.9%. Some selective coatings with different layer thicknesses have been successfully optimized for different solar irradiations (air mass (AM0), AM1.5D, and AM1.5G spectra) and different operating temperatures (300, 450, and 600 oC), respectively. However, the optical constants for calculation are from the software, most datum are measured for bulk materials. Therefore, results are more useful to indicate the trend than the exact values.
Chinese Optics Letters
- Publication Date: May. 10, 2013
- Vol. 11, Issue s1, S10501 (2013)
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