NDLI: Development of high efficiency mono-crystalline silicon solar cells: Optimization of rear local contacts formation on dielectrically passivated surfaces

Content Provider	IEEE Xplore Digital Library
Author	Wijekoon, K. Mungekar, H. Stewart, M. Kumar, P. Franklin, J. Agrawal, M. Rapolu, K. Fei Yan Yi Zheng Chan, A. Vellaikal, M. Xuesong Lu Kochhar, D. Lin Zhang Tanner, D. Dabeer, V. Ponnekanti, H.
Copyright Year	2012
Description	Author affiliation: Applied Materials, 3535 Garrett Drive, Santa Clara, CA95054, USA (Wijekoon, K.; Mungekar, H.; Stewart, M.; Kumar, P.; Franklin, J.; Agrawal, M.; Rapolu, K.; Fei Yan; Yi Zheng; Chan, A.; Vellaikal, M.; Xuesong Lu; Kochhar, D.; Lin Zhang; Tanner, D.; Dabeer, V.; Ponnekanti, H.)
Abstract	An integration process was developed for the fabrication of rear passivated point contact solar cells achieving 19.36% conversion efficiency by using 156×156mm, pseudo square, p-type single crystalline silicon wafers. This is a significant improvement when compared to unpassivated, full area aluminum back surface field solar cells, which exhibit only 18.64% conversion efficiency on the same wafer type. The rear surface was passivated with a Al layer and a SiN capping layer. The thicknesses of individual films were optimized to obtain maximum minority carrier lifetimes. The rear surface contact pattern was created by laser ablation and the contact geometry was optimized to obtain voids free contact filling resulting in a uniform back surface field. Internal quantum efficiency and reflectance measurement show significant improvement in rear passivated cells in the infrared wavelength region in comparison to reference cells. The rear surface internal reflectivity for the passivated cell was 93% while that for the reference cell was only about 73%. The rear surface recombination velocity for the rear passivated cell was about 52 cm/s while that for the reference cell was about 300 cm/s. The efficiency gain in rear passivated cells over the reference cells is mainly due to improved short circuit current and open circuit voltage. However, rear passivated solar cells show lower fill factors due to increased series resistance.
Starting Page	001158
Ending Page	001162
File Size	4682908
Page Count	5
File Format	PDF
ISBN	9781467300643
ISSN	01608371
e-ISBN	9781467300667
DOI	10.1109/PVSC.2012.6317807
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	Silicon Aluminum Photovoltaic cells Passivation Firing Reflectivity
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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