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J. Bullock, A. Cuevas, D. Yan, B. Demaurex, A. Hessler-Wyser, S. Wolf (2014)
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Thermal oxide (SiO2) and hydrogen-rich amorphous silicon (a-Si:H) interlayer at the front metal-silicon contact of thin silicon solar cells has been optimized based on a theoretical model. An analytical solution to the complete set of equations has been provided to highlighted the potential use and implications of the a-Si:H/SiO2 as a passivation coating at the front surface in crystalline silicon solar cells. The simple analytical expressions of the emitter reverse saturation current density and the photocurrent density were also obtained taking into account bulk recombination velocity and non-uniform doping profile. An optimum a-Si:H/SiO2 interlayer thicknesses were noted to enhance the collection of light-generated free carriers, which improves the efficiency of the short wavelength quantum. This is achieved by a drastic reduction in the effective recombination at the emitter upper boundary, a properly primarily responsible for the decrease in the emitter saturation current density. The findings indicated that the emitter region should be treated as an active layer because an optimum a-Si:H/SiO2 interlayer thicknesses at the front contact (W n,1 = 5 nm and δ = 14 Å) give an improvement that can reach 3.6 mA/cm2 for the photocurrent density, 63 mV for the open-circuit voltage, and 3.95% for the cell efficiency.
Optical and Quantum Electronics – Springer Journals
Published: Jul 10, 2017
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