NDLI: The effect of rear surface passivation layer thickness on high efficiency solar cells with planar and scattering metal reflectors

Content Provider	IEEE Xplore Digital Library
Author	Yang Yang Mehrvarz, H. Pillai, S. Green, M. Kampwerth, H. Ho-Baillie, A.
Copyright Year	2012
Description	Author affiliation: Photovoltaics Centre of Excellence, University of New South Wales, Sydney 2052, Australia (Yang Yang; Mehrvarz, H.; Pillai, S.; Green, M.; Kampwerth, H.; Ho-Baillie, A.)
Abstract	Rear surface reflector of solar cell is designed to improve light collection capacity by allowing the low energy photons to go through multiple bounces inside the solar device before escaping. In this paper, we investigate the thickness effect of rear SiO surface passivation layer on both optical and electrical properties of front-planar high efficiency PERT (Passivated Emitter and Rear Totally-Diffused) solar cells. Two kinds of metal reflectors are fabricated: the conventional planar reflectors by evaporated Al and the novel scattering reflectors by self assembled Ag nanoparticles. We find that the thickness dependence of rear SiO layer (from 8 nm – 134 nm) on photocurrent shows an asymmetry for planar and scattering reflectors, moreover, the scattering reflectors perform much better than the planar reflectors under all tested SiO thicknesses. A maximum current enhancement (calculated from wavelength 900 nm to 1200 nm) of 12.1% is presented for planar reflector with 134 nm SiO film, and 18.4% for scattering reflector with the optimized 19 nm rear SiO film. Additionally, by adding a detached metal mirror, the maximum current enhancement from scattering reflector jumps to 27.0%. Effective optical path length Z is calculated to study the light trapping (optical properties) under various SiO thicknesses for both reflectors. Diffusion length L is calculated to track the electrical performance. It is shown that thicker SiO is of benefit for both optical and electrical properties when planar Al reflector is used. However, for scattering reflectors, thinner SiO is preferable for optical enhancement, but thicker SiO is desirable for electrical gain. 19 nm SiO is found to be the best choice for cells with scattering reflectors, considering both effects.
Starting Page	001172
Ending Page	001176
File Size	2659526
Page Count	5
File Format	PDF
ISBN	9781467300643
ISSN	01608371
e-ISBN	9781467300667
DOI	10.1109/PVSC.2012.6317810
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical reflection Photovoltaic cells Optical scattering Passivation Optical films Metals high efficiency solar cell Planar rear reflector scattering rear reflector surface passivation layer
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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