EU PVSEC Programme Online
EU PVSEC 2021, 6 - 10 September 2021
Presentation: 2AO.9.3 Equipment Development for Simultaneously Bifacial Plating Metallization in Bifacial Solar Cells
Type: Oral
Date: Monday, 6th September 2021
17:00 - 18:30
Author(s): Y.-C. Chang, S. Wang, R. Deng, S. Li, J. Ji
Presenter / Speaker: Y.-C. Chang, UNSW Australia, Sydney, Australia
Event: Conference Conference
Session: 2AO.9 Production Processes of Silicon Solar Cells
Topic: 2. 6 Manufacturing & Production of Si Cells
Keywords: Plated Contacts, Bifacial Plating, Plating Equipment
Summary / Abstract: For silicon solar cells, screen-printing has long been favored by the manufacturers due to its simplicity and high throughput. Over decades of technology advancement, screen-printing has almost pushed to its material and equipment limits (e.g. high-aspect ratio of finger, material impacts on cell etc.). However, in recent years, the increasing silver prices, reducing wafer thickness, and emerging new cell designs continue introducing challenges to this mature technology. Those issues have provided incentives to seek metallization alternatives. Among various metallization techniques, Ni/Cu plated contacts could be the most promising candidate due to its scaling up potential. However, there has been a delay of market share increase versus the ITRPV predication. The lack of readily available appropriate equipment and process standard could be the key reason to cause this. Here, we presented the developing UNSW bifacial plating technology. The special designed industrial prototype has greatly improved the plating uniformity and product stability. Moreover, double sides of the cell could be simultaneously plated thereby effectively reducing the processing time. In this paper, the design consideration and engineering solutions were plainly reviewed. The robust cell metallization process has been demonstrated on 6-inch industrial bifacial PERC precursors and primary intergraded with hydrogenation technology successfully. Despite that, this plating prototype could also be applied on other cell structures such as TOPCon, HJT and tandem structure. This innovative technology would remarkably optimize the processing engineering of plating metallization and may promote the utilization of plated contacts in solar cells manufacturing.