>23% High-Efficiency Tunnel Oxide Junction Bifacial Solar Cell With Electroplated Cu Gridlines

Author

Heng, Jiunn Benjamin ; Jianming Fu ; Kong, Bob ; Yongkee Chae ; Wei Wang ; Zhigang Xie ; Reddy, Arun ; Lam, Kin-Man ; Beitel, Chris ; Liao, Chenglin ; Erben, Christoph ; Zhiquan Huang ; Zheng Xu

Author_Institution

Silevo, Inc., Fremont, CA, USA

Volume

5

Issue

1

fYear

2015

fDate

Jan. 2015

Firstpage

82

Lastpage

86

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 (V_oc) 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.

Keywords

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; Heterojunctions; Passivation; Photovoltaic cells; Photovoltaic systems; Silicon; Bifacial; heterojunction; high efficiency;

fLanguage

English

Journal_Title

Photovoltaics, IEEE Journal of

Publisher

ieee

ISSN

2156-3381

Type

jour

DOI

10.1109/JPHOTOV.2014.2360565

Filename

6960882