한국신재생에너지학회:학술대회논문집
- 2010.11a
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- Pages.53.2-53.2
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- 2010
The application of Nano-paste for high efficiency back contact Solar cell
고효율 후면 전극형 태양전지를 위한 나노 Paste의 적용에 대한 연구
- Published : 2010.11.16
Abstract
In this study, we focused on our specialized electrode process for Si back-contact crystalline solar cell. It is different from other well-known back-contact cell process for thermal aspect and specialized process. In general, aluminum makes ohmic contact to the Si wafer and acts as a back surface reflector. And, silver is used for low series resistance metal grid lines. Aluminum was sputtered onto back side of wafer. Next, silver is directly patterned on the wafer by screen printing. The sputtered aluminum was removed by wet etching process after rear silver electrode was formed. In this process, the silver paste must have good printability, electrical property and adhesion strength, before and after the aluminum etching process. Silver paste also needs low temperature firing characteristics to reduce the thermal budget. So it was seriously collected by the products of several company of regarding low temperature firing (below
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