Localised back contact to ONO passivated c‐Si solar cells using laser fired contact method

The localised back contact method for SiO2/SiNx/SiO2 (ONO) back surface passivated crystalline silicon solar cells has been investigated using a 1064 nm Nd:YAG laser. From the quasi‐steady‐state‐photoconductance measurements, feasible passivation properties of effective carrier lifetime (τeff), back...

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Bibliographic Details
Published in:Electronics letters 2013-02, Vol.49 (4), p.290-291
Main Authors: Choi, P.H., Baek, D.H., Kim, H.J., Kim, K.S., Park, H.S., Lee, J.H., Yi, J.S., Choi, B.D.
Format: Article
Language:English
Subjects:
Applied sciences
back surface passivated crystalline silicon solar cells
back surface recombination velocity
carrier lifetime
diffusion length
dot diameter
dot spacing
Energy
Exact sciences and technology
feasible passivation properties
laser fired contact method
lcalised back contact
localised back contact method
Natural energy
Nd:YAG laser
ONO passivated c‐Si solar cells
ONO passivated layer
passivation
Photovoltaic conversion
quasi‐steady‐state‐photoconductance measurements
silicon
silicon compounds
solar cells
Solar cells. Photoelectrochemical cells
Solar energy
solar simulator measurements
solid lasers
wavelength
wavelength 1064 nm
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Summary:The localised back contact method for SiO2/SiNx/SiO2 (ONO) back surface passivated crystalline silicon solar cells has been investigated using a 1064 nm Nd:YAG laser. From the quasi‐steady‐state‐photoconductance measurements, feasible passivation properties of effective carrier lifetime (τeff), back surface recombination velocity (Seff) and diffusion length (LD) with the ONO passivated layer rather than with the SiNx single layer have been confirmed. Localised point back contacts were formed varying with dot diameter and dot spacing and then the cell performance was characterised from solar simulator measurements. It was confirmed that the cell performance is closely related to the back contact area which is determined by dot diameter and spacing, and dot spacing is the more crucial factor to determine the cell performance than diameter variations.
ISSN:1350-911X
0013-5194
1350-911X
DOI:10.1049/el.2012.4465