SnOP2O5 glass frits were synthesized by melt-quenching.
Pb-free Ag pastes with SnOP2O5 glass frits were developed.
C-Si solar cells with SnO-based Ag pastes were fabricated and tested.
A cell efficiency of 7.2% was achieved with the optimal SnO-based Ag paste.
Unique interfacial morphology was observed for sintered SnO-based Ag pastes.