Analysis of Contact Reaction Phenomenon between Aluminum–Silver and p+ Diffused Layer for n-Type c-Si Solar Cell Applications

Cheolmin Park, Sungyoon Chung, Nagarajan Balaji, Shihyun Ahn, Sunhwa Lee, Jinjoo Park and Junsin Yi
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Cheolmin Park: Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea
Sungyoon Chung: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea
Nagarajan Balaji: Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea
Shihyun Ahn: Department of Electrical and Computer Engineering, University of Seoul, 163, Seoulsiripdae-ro, Dongdaemun-gu, Seoul 02504, Korea
Sunhwa Lee: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea
Jinjoo Park: Major of Energy and Applied Chemistry, Division of Energy & Optical Technology Convergence, Cheongju University 298, Daeseong-ro, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, Cheongju 28503, Korea
Junsin Yi: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea

Energies, 2020, vol. 13, issue 17, 1-11

Abstract: In this study, the contact mechanism between Ag–Al and Si and the change in contact resistance (Rc) were analyzed by varying the firing profile. The front electrode of an n-type c-Si solar cell was formed through a screen-printing process using Ag–Al paste. Rc was measured by varying the belt speed and peak temperature of the fast-firing furnace. Rc value of 6.98 mΩ-cm −2 was obtained for an optimal fast-firing profile with 865 °C peak temperature and 110 inches per min belt speed. The contact phenomenon and the influence of impurities between the front-electrode–Si interface and firing conditions were analyzed through scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The EDS analysis revealed that the peak firing temperature at 865 °C exhibited a low atomic weight percentage of Al (0.72 and 0.36%) because Al was involved in the formation of alloy of Si with the front electrode. Based on the optimal results, a solar cell with a conversion efficiency of 19.46% was obtained.

Keywords: metallization; contact formation; Ag/Al paste; p+ emitter; N-type bifacial solar cells (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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