Simulation, Fabrication And Characterization Of Multilayer Coated Solar Cells

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Date
2011-01
Authors
Aziz, Wisam Jaefar
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Publisher
Universiti Sains Malaysia
Abstract
This work is a combination of a theoretical simulation and an experimental fabrication of multilayer coated solar cells. ISE-TCAD simulator, release 9.5 was used in the theoretical part. A simulation model was established by employing known theories relevant to solar cells and the experimental data was applied to validate the simulation results. The solar cells were fabricated by means of texturing and antireflection coating. For texturing, alkaline (KOH) and mixture acidic solution (HNO3+HF+CH3COOH, 15:3:2) were used. For antireflection coating, ZnO/TiO2 and porous silicon were used to increase the light trapping of solar cell structures. Furthermore, texturing through an acidic solution and double antireflection coating (ZnO/TiO2) at the top and a reflection coating at the bottom were used to fabricate a new structure of multilayer coated solar cell. Surface morphology and structured properties of samples under this study were characterized using Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). Raman and Photoluminescence (PL) measurements were carried out at room temperature. Optical reflectance was experimentally obtained using Filmetrics (F20). Current density-Voltage (J-V) of multilayer coated solar cell was measured under illumination conditions of 80 mW/cm2. The simulation results showed an increase in the values of the solar cells which is ascribed to the increase in the open circuit voltage that produced high efficiencies of (15.94 %) for porous silicon (PS) and (8.84 %) for the silicon as grown (c-Si). The experimental results of acidic solutions texturing and ZnO/TiO2 coating revealed higher efficiency (12.04%) compared with alkaline texturing and ZnO/TiO2 coating (10.31%). The experimental results also showed that porous silicon n-type (100) increased the conversion efficiency 15.42% compared with porous silicon ptype (100) whose efficiency was 11.23%. Finally, the current density-voltage of the structure which includes acidic texturing of silicon n-type (100) and antireflection coating ZnO/TiO2 at the top and the reflection coating at the back showed that the short circuit current density was 28.9 mA/cm2, open circuit voltage was 0.55 V and the conversion efficiency of solar cell was 15.76 %. Overall, these results obtained clearly indicate the advantage of using simulation and experimental study to investigate new structures of solar cells.
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Keywords
Theoretical simulation and an experimental , fabrication of multilayer coated solar cells
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