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Effects of surface morphology on Ag crystallite formation in screen-printed multi-crystalline Si solar cells

Authors
Han, H.Choi, D.Jeong, S.Kang, D.Park, H.Bae, S.Kang, Y.Lee, H.-S.Kim, D.
Issue Date
15-6월-2021
Publisher
Elsevier Ltd
Keywords
Crystallization; Electron density; Morphology; Silicon solar cell
Citation
Materials Science in Semiconductor Processing, v.128
Indexed
SCIE
SCOPUS
Journal Title
Materials Science in Semiconductor Processing
Volume
128
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/128781
DOI
10.1016/j.mssp.2021.105759
ISSN
1369-8001
Abstract
The electrode collects electrons produced by a solar cell. Ag crystallites generated during front electrode formation play an important role in transferring electrons from the emitter to the Ag finger. Previously, the formation mechanism of Ag crystallites and the various factors influencing Ag crystallite formation have been studied, including the effect of surface morphology on Ag crystallite formation. The glass coverage varies with the texture of the Si surface, and thus the degree of exposure of the Si surface varies correspondingly. When the Si surface is exposed, direct contact is achieved, and contact resistance is improved. However, the effect of surface morphology on the Ag crystallites formed on the Si surface under the glass layer has not yet been studied. The effect of surface morphology on Ag crystallite formation is presented in this work. Two multi-crystalline Si wafers with different surface morphologies were compared. The first multi-crystalline Si wafer was textured using metal-catalyzed chem ical etching (MCCE). The second multi-crystalline Si wafer was textured by MCCE followed by reactive ion etching. Wafers with sharper textures had lower series resistances, higher fill factors, and a large amount of Ag crystallites. Ag crystallites primarily formed at the tips of the texture. To analyze the effect of surface morphology, the surface electron concentration was confirmed by simulation. Electron concentration at the tip was proportional to the sharpness of the tip. Therefore, when the firing process is performed at the same temperature, wafers with sharper tips are expected to exhibit better electrode characteristics. © 2021
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Graduate School of Energy and Environment (KU-KIST GREEN SCHOOL) > Department of Energy and Environment > 1. Journal Articles

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