>23% High-Efficiency Tunnel Oxide Junction Bifacial Solar Cell With Electroplated Cu Gridlines
Photovoltaics, IEEE Journal of (2015)
Abstract
Based on the metal-insulator-semiconductor concept, Triex cell is a proprietary device structure that combines a tunnel oxide junction with doped a-Si thin-film emitter layers on n-type Czochralski silicon wafers. A simple patterning process is used along with cost-effective copper electrochemical plating to form the electrodes. This paper reports a >23% high-efficiency Triex solar cell, postoptimizing key process areas to improve passivation, junction quality, and shading effects. High open-circuit voltage (Voc) of 739 mV and good fill factor of 80.5% have been demonstrated on a 6-in solar cell. A champion 380-W Triex bifacial module is also validated under standard test conditions.
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Key words
MIS structures,amorphous semiconductors,copper,crystal growth from melt,electrochemical electrodes,electroplating,semiconductor growth,semiconductor thin films,solar cells,Si-Cu,Triex cell,a-Si thin-film emitter layers,electrochemical plating,electroplated gridlines,fill factor,high-efficiency tunnel oxide junction bifacial solar cell,junction quality,metal-insulator-semiconductor concept,n-type Czochralski silicon wafers,open-circuit voltage,patterning process,shading effects,test conditions,Bifacial,heterojunction,high efficiency
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