Pb-free glass frits prepared by spray pyrolysis as inorganic binders of Al electrodes in Si solar cells |
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Authors: | Jang Heui YiHye Young Koo Jung Hyun KimYou Na Ko Young Jun HongYun Chan Kang Hye Moon Lee |
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Affiliation: | a Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Republic of Korea b Functional Materials Division, Korea Institute of Materials Science, 531 Changwonadaero, Changwon, Gyeongnam, 641-831, Republic of Korea |
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Abstract: | Pb-free glass frits prepared by spray pyrolysis for Al electrodes were of fine size, spherical morphology and dense structure. Their mean size and geometric standard deviation when prepared at 1,200 °C were 1.0 μm and 1.4, respectively. Their glass transition temperature (Tg) was 374 °C. An Al electrode formed from Al paste with glass frits had a dense structure and good adhesion to the Si substrate. It had a well-developed back-surface field layer of 17.5 μm thickness. Al electrodes formed from Al paste without glass frits had sheet resistances between 21 and 32 mΩ sq−1 as the firing temperature changed from 600 to 900 °C. This compared with values from electrodes formed with frits that decreased from 20 to 7 mΩ sq−1 over the same range of firing temperatures. |
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Keywords: | Spray pyrolysis Aluminum electrode Glass material Solar cell |
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