Author:
Mehta Vishal,Sopori Bhushan,Reedy Robert,To Bobby,Moutinho Helio,Ravindra Nuggehalli M.
Abstract
AbstractThis paper identifies some mechanisms that lead to problems in back Al contact formation. Major issues are related to a basic problem that the Al melt has a large surface tension and tries to ball up during the firing step. Other issues arise from dissolution of the Si-Al interface and entrapment of glass within the Si-Al alloy. Si diffusion into Al can be applied to control the melt, while cooling rate can help improve the structure of various regions of the back contact for a favorable series resistance. We also discuss a modified time-temperature profile that can lead to a deep and uniform back-surface field.
Publisher
Springer Science and Business Media LLC
Reference13 articles.
1. 5 Sopori B. and Mehta V. Back Al contact formation, to be published.
2. 6 Sopori B. Mehta V. Rupnowski P. Domine D. Romero M. Moutinho H. To B. Reedy R. , Al-Jassim M. , Shaikh A. Merchant N. and Khadilkar C. Proc. 22nd European Photovoltaic Solar Energy Conference, Milano, 2007, pp. 841–848.
3. Operating limits of Al-alloyed high-low junctions for BSF solar cells
4. Effect of Al-induced gettering and back surface field on the efficiency of Si solar cells