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The light-trapping effect in various textured cover glass for enhancing the current density in silicon heterojunction solar cells
摘要： Light trapping by front surface texturing is considered an important mechanism since it can reduce the reflectance on the surface, enhance the photo-generated charge carriers and hence the performance of solar cells. Since the silicon (p, i, n) layers are deposited after surface texturing that may induce various defects leading to a reduction in open-circuit voltage (Voc) and fill factor (FF). In this study, textured glass surfaces and silicon heterojunction solar cells (HJSCs) were prepared separately. The textured glass surface was optically coupled with the index matching solution (IMS) at the front surface of HJSCs for an enhancement in current density. Three wet chemical textured glass surfaces named Etch 1, Etch 2 and Etch 3 were employed based on various optical properties. It was observed during the current density-voltage (J-V) measurements that Voc and FF of the device did not change. Reference HJSC coupled with flat glass showed J-V characteristic as Voc=726.3 mV, FF=76.62%, Jsc=37.9 mA/cm2, ?=21.09% without IMS. The Jsc of HJSCs coupled with textured glass surface can be further enhanced by using IMS due to better light trapping. HJSCs coupled with textured glass (Etch 2) surface showed the highest Jsc of 38.4 mA/cm2 with an efficiency of 21.4% without IMS whereas it showed an efficiency of 22.41% with Jsc of 40.2 mA/cm2 using IMS. The trends in the external quantum efficiency of the HJSCs indicate that the Jsc can be improved if a suitable index matching solution and glass material are used.
关键词： textured glass,current density,light trapping,index matching solution,Solar cell
更新于2025-09-16 10:30:52
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Suppression of viewing angle dependence of TEOLED devices with internal nano-wrinkle structure
摘要： In order to suppress the viewing angle dependence of top emission organic emitting diodes (TEOLEDs) with strong microcavity effect, we introduced randomly distributed nano-wrinkle structure beneath highly reflective anode. By applying such nano-wrinkle pattern, viewing angle dependence and color shift could be improved compared with that without nano-structure [e.g. Δ(u’, v’): 0.077 → 0.025]. However, current efficiency reduced more than half. To compensate this problem, we additionally introduced index matching epoxy filler between encapsulation glass and TEOLED device. By this approach, current efficiency drop of device with nano-wrinkle structure could be improved. For example, the efficiency dropped by 7.7% when we filled the epoxy filler between capping layer and glass lid while, it decreased by 30.8% if we don’t use epoxy filler. We found that index matching helps to extract more light confined inside TEOLED, so device performance degradation could be minimized. In addition, when we attached a circular polarizer film to these devices, depolarization was observed in most cases, but we were able to achieve a perfect black state from the devices with nano-wrinkle structure underneath reflective anode.
关键词： Black tint,Viewing angle dependence,Index matching,Nano structure,TEOLED,Color shift
更新于2025-09-11 14:15:04
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[ASME ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting - Montreal, Quebec, Canada (Sunday 15 July 2018)] Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fluid Dynamics of Wind Energy; Bubble, Droplet, and Aerosol Dynamics - Refractive Index Matching for Optical Flow Investigation With High Density Stratification
摘要： Turbulent mixing in density stratified environments represents a challenging task in experimental turbulence research. When optical measurement techniques like Particle Image Velocimetry (PIV) are applied to stratified liquids, it is common practice to combine two aqueous solutions with different densities but equal refractive indices. As a result, light deflections/distortions due to the mixing of the fluids can be suppressed. While refractive image matching (RIM) was developed in the late ‘70s, the limit of a 4% density ratio had yet to be reported before this work. In the present work, a methodology based on the behavior of changes in a multi component methodology allows RIM for solutions with higher density differences. The applicability of this methodology is experimentally demonstrated with a turbulent buoyant jet using a ternary combination of water, isopropanol and glycerol, for which an index matched density ratio of 8.6% has been achieved (Krohn et al. 2018). Measurements were conducted with a high fidelity synchronized PIV/PLIF system and the results are qualitatively compared in terms of turbulent statistics.
关键词： PIV,density stratification,refractive index matching,PLIF,Turbulent mixing
更新于2025-09-09 09:28:46