An Evaluation of Constituents in Paste for Silicon Solar Cells with Floating Contact Method: A Case Study of Tellurium Oxide Effects

9 Pages Posted: 29 Mar 2018 Last revised: 20 Apr 2018

See all articles by Takayuki Aoyama

Takayuki Aoyama

Noritake Co., Limited

Mari Aoki

Asada Mesh Co., Ltd.

Isao Sumita

Asada Mesh Co., Ltd.

Yasushi Yoshino

Noritake Co., Limited

Atsushi Ogura

Meiji University

Date Written: April 15, 2018

Abstract

Metallization contacts on emitter of silicon solar cells cause shunting of p-n junction and induce carrier recombination, resulting in a loss in open-circuit voltage Voc of the cells, which must severely limit cell efficiency. But, the mechanism of the shunting and the recombination has not been understood enough yet, especially on the contacts with conductive paste, because the shunting and the recombination caused by the paste come of multiple effects of each constituent in the paste such as silver metal, glass frit, and some additives. Thus, the effects of the each constituent in the paste should be clarified to elucidate the mechanism and to achieve an advanced paste for high-efficiency silicon solar cells. In our previous study, effects of aluminum in silver/aluminum paste and effects of glass frit itself on the shunting and the recombination in n-type solar cells were clearly shown by using “floating contact method”, and its effectiveness on the paste evaluation were demonstrated in the solar cells. In this study, the floating contact method was applied to conventional p-type solar cells with silver paste to clarify effects of tellurium oxide on the silver paste, because the detailed effects of the tellurium oxide on the shunting and the recombination have not been clear yet even though the oxide is widely used for commercial paste. Our study clearly shows that the tellurium oxide reduces the shunting and the recombination caused by the silver paste in the solar cells, and also demonstrates the effectiveness of the floating contact method on the paste evaluation.

Keywords: shunting, recombination, tellurium, silver paste, silicon, solar cells, floating contact

Suggested Citation

Aoyama, Takayuki and Aoki, Mari and Sumita, Isao and Yoshino, Yasushi and Ogura, Atsushi, An Evaluation of Constituents in Paste for Silicon Solar Cells with Floating Contact Method: A Case Study of Tellurium Oxide Effects (April 15, 2018). 7th Workshop on Metallization and Interconnection for Crystalline Silicon Solar Cells, 2017. Available at SSRN: https://ssrn.com/abstract=3152258 or http://dx.doi.org/10.2139/ssrn.3152258

Takayuki Aoyama (Contact Author)

Noritake Co., Limited ( email )

3-1-36, Noritake-shinmachi, Nishi-ku
Nagoya-shi, Aichi
Japan

Mari Aoki

Asada Mesh Co., Ltd. ( email )

Osaka Headquarters
23-7, Shindo-4, Matsubara
Osaka, 580-0015
Japan

Isao Sumita

Asada Mesh Co., Ltd. ( email )

Osaka Headquarters
23-7, Shindo-4, Matsubara
Osaka, 580-0015
Japan

Yasushi Yoshino

Noritake Co., Limited ( email )

3-1-36, Noritake-shinmachi, Nishi-ku
Nagoya-shi, Aichi
Japan

Atsushi Ogura

Meiji University ( email )

1-1 Kanda Surugadai
Surugadai, Chiyoda, 101-8301
Japan

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