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Effects of particle size of aluminum powder in silver/aluminum paste on n-type solar cells

  • Received: 08 May 2018 Accepted: 17 July 2018 Published: 26 July 2018
  • Silver paste, which mainly consists of silver metal, glass frit, and organics, has been used for contacting n+ emitter of conventional p-type solar cells, whereas aluminum-added silver paste (silver/aluminum paste) has been used for p+ emitter of n-type solar cells. It has been reported that the addition of aluminum powder to the silver paste decreases contact resistance between the paste electrodes and the p+ emitter with increasing content of the aluminum powder in the paste, and in addition, that the silver/aluminum paste creates large and deep metallic spikes underneath the paste, which has been considered to decrease the contact resistance. However, how particle size of the aluminum powder affects the contact resistance and the electrical characteristics of the n-type solar cells has not been clear yet. In this study, the effects of the particle size of aluminum powder in the silver/aluminum paste on the contact resistance and the electrical characteristics are investigated. Our study demonstrates that the particle size of the aluminum powder strongly affects the contact resistance and the electrical characteristics. The contact resistance decreases not only with increasing the content of the aluminum powder in the silver/aluminum paste, but also with increasing the particle size of the powder. In addition, the optimization of the particle size of the aluminum powder can effectively increase FF of the n-type solar cells, resulting in increasing efficiency of the cells.

    Citation: Takayuki Aoyama, Mari Aoki, Isao Sumita, Atsushi Ogura. Effects of particle size of aluminum powder in silver/aluminum paste on n-type solar cells[J]. AIMS Materials Science, 2018, 5(4): 614-623. doi: 10.3934/matersci.2018.4.614

    Related Papers:

  • Silver paste, which mainly consists of silver metal, glass frit, and organics, has been used for contacting n+ emitter of conventional p-type solar cells, whereas aluminum-added silver paste (silver/aluminum paste) has been used for p+ emitter of n-type solar cells. It has been reported that the addition of aluminum powder to the silver paste decreases contact resistance between the paste electrodes and the p+ emitter with increasing content of the aluminum powder in the paste, and in addition, that the silver/aluminum paste creates large and deep metallic spikes underneath the paste, which has been considered to decrease the contact resistance. However, how particle size of the aluminum powder affects the contact resistance and the electrical characteristics of the n-type solar cells has not been clear yet. In this study, the effects of the particle size of aluminum powder in the silver/aluminum paste on the contact resistance and the electrical characteristics are investigated. Our study demonstrates that the particle size of the aluminum powder strongly affects the contact resistance and the electrical characteristics. The contact resistance decreases not only with increasing the content of the aluminum powder in the silver/aluminum paste, but also with increasing the particle size of the powder. In addition, the optimization of the particle size of the aluminum powder can effectively increase FF of the n-type solar cells, resulting in increasing efficiency of the cells.


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    [2] Kerp H, Kim S, Lago R, et al. (2006) Development of screen printable contacts for p+ emitters in bifacial solar cells. 21st European Photovoltaic Solar Energy Conference, Dresden, Germany, 892–894.
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    [8] Fritz S, Engelhardt J, Ebert S, et al. (2016) Contacting boron emitters on n-type silicon solar cells with aluminium-free silver screen-printing pastes. Phys Status Solidi-R 10: 305–309. doi: 10.1002/pssr.201510443
    [9] Aoyama T, Aoki M, Sumita I, et al. (2016) Effects of aluminum in metallization paste on the electrical losses in bifacial n-type crystalline silicon solar cells. Energy Procedia 98: 106–114. doi: 10.1016/j.egypro.2016.10.086
    [10] Wefers K, Misra C (1987) Oxides and Hydroxides of Aluminum. Alcoa Technical Paper No. 19, Revised, Alcoa Laboratories.
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  • © 2018 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0)
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