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Characterization of optical absorption and photovoltaic properties of silicon wire solar cells with different aspect ratio

Characterization of optical absorption and photovoltaic properties of silicon wire solar cells with different aspect ratio
Baek, SH[Baek, Seong-Ho]Jang, HS[Jang, Hwan Soo]Kim, JH[Kim, Jae Hyun]
DGIST Authors
Baek, SH[Baek, Seong-Ho]; Jang, HS[Jang, Hwan Soo]; Kim, JH[Kim, Jae Hyun]
Issue Date
Current Applied Physics, 11(1), S30-S33
Article Type
Article; Proceedings Paper
AbsorptionAir MassAl-Doped Zinc Oxide FilmsAspect RatioAtomic Layer DepositionAZO FilmsCell EfficiencyConversion EfficiencyDiffusion MethodDoping (Additives)Efficiency EnhancementElectrical ContactsElectrochemical EtchingElectrochemistryEnergy ConversionFilm PreparationLarge Surface AreaLight-TrappingLight AbsorptionOptical AbsorptionOptical PropertiesP-N JunctionPassivationPhotovoltaic EffectsPhotovoltaic PropertySemiconductor JunctionsSi Solar CellsSi Wire ArraySiliconSilicon-BasedSilicon WireSilicon WiresSolar CellsSolar EnergySolar Power GenerationSpin-on-DopantSurface PassivationSurface RecombinationsTop ContactVertically AlignedWireWire ArraysWire LengthZinc Oxide
The characteristics of optical absorption and photovoltaic properties of silicon(Si) wire solar cells with different aspect ratio have been studied. Vertically aligned Si wire arrays were fabricated by electrochemical etching and p-n junction was prepared by spin-on-dopant (SOD) diffusion method. To demonstrate the effect of wire length, it was controlled with varying electrochemical etching time. We also investigated the optical properties of wire arrays with increasing wire length. 50-nm-thick Al-doped zinc oxide (AZO) film was used as a surface passivation and electrical contact layer that conformally deposited on the radial p-n junction Si solar cell by atomic layer deposition (ALD) technique. We have observed efficiency enhancement with increasing wire length that increases the light trapping within the Si wire arrays, while the large surface area results in increased surface recombination. From the cell efficiency data, we identify that the surface recombination effect becomes more significant in the large surface area solar cells. To overcome this issue, we demonstrate the effect of a highly conformal AZO film grown by ALD to serve as surface passivation layer and top contact electrode. The conversion efficiency of the best sample is 7.1% and short circuit current (Jsc) of 25.3 mA/cm2 under 100 mW/cm2 of air mass (AM) 1.5G illumination, when the Si wire length is 8 μm with AZO coating. These results present that optimization of the wire length and surface passivation is necessary for silicon based solar cells prepared by electrochemical etching to enhance the solar cell energy conversion efficiency. © 2010 Published by Elsevier B.V. All rights reserved.
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