Cu-Zr-based metallic glass (MG) has been applied as a binding agent of Ag paste for front contact formation in Si solar cell by screen printing process. Use of electroconductive MG binder significantly improves the quality of the contact by the formation of highly dense 10-50 nm size Ag crystallites and the noncorrugation of the emitter surface with a very shallow Ag crystallite penetration depth of 10-30 nm. Nanoscale Ag crystallites form on the emitter surface by local Si-Cu-Ag eutectic melting, leading to the formation of pyramidal pits on the Si emitter surface, followed by precipitation of Ag crystallites during cooling.
Bibliographical noteFunding Information:
We would like to thank Cheil Industries for the material processing support, Dr. Jucheol Park for TEM analysis (Research Institute of Advanced Materials, Seoul National University, Korea), and Dr. Hwi-Jun Kim for the fabrication of MG powders (Korea Institute of Industrial Technology, Korea). J. Eckert and D.H Kim acknowledge the support by the Global Research Laboratory Program of the Korean Ministry of Education, Science and Technology. The authors also thank L. B. Bruno, N. Mattern, D. Miracle, J. Schroers, and M. Stoica for stimulating discussions.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)