Modified laser­fired contact process for efficient PERC solarcells

Title
Modified laser­fired contact process for efficient PERC solarcells
Authors
김원목이택성박종극김인호정증현이도권최재명정범식최재영주병권
Keywords
laser-fired contact; PERC cell; pulsed laser; crystal silicon solar cells; contact resistance
Issue Date
2019-12
Publisher
Progress in photovoltaics
Citation
VOL 27, NO 12-1103
Abstract
A laser‐ fired contact (LFC) process is one of the techniques for making local electrical contacts at the rear side of passivated emitter and rear cell (PERC) solar cells. In the LFC process, opening of the passivated dielectric layers and alloying of Si and Al need to be made in a single step laser process. For this reason, the LFC process is accompanied by the loss of Al and the laser damage to the Si wafer. In this study, we present a novel multistep LFC process combining the conventional LFC and laser‐ induced forward transfer (LIFT) processes. The modified LFC scheme we proposed consists of three steps: (a) opening of the passivation layers and partial alloying of Al‐ Si, (b) additional deposition of Al on the local contact holes, and (c) post laser firing of the transferred Al. Applying the modified LFC process to the PERC cells of 1.0 cm2 of area, we demonstrate the effective recombination velocity of the laser‐ processed wafers can be remarkably reduced while maintaining the low contact resistance. The best of the PERC solar cell fabricated by the modified LFC process exhibited an efficiency of 19.5% while the conventional LFC‐ PERC cell showed 18.6%. The efficiency gains of the modified LFC‐ PERC cells was largely contributed by the enhanced open circuit voltage (Voc) and fill factor (FF).
URI
http://pubs.kist.re.kr/handle/201004/70061
ISSN
1062-7995
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KIST Publication > Article
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