Ivan L. Opao

Sodium‐Induced Process Window Expansion Enables High‐Performance Solution‐Processed CISSe Thin‐Film Solar Cells for Tandem Applications

ABSTRACT This work reports a sodium‐enabled breakthrough in air‐processable N,N‐dimethylformamide (DMF) molecular ink routes for CuIn(S,Se) 2 (CISSe) solar cells. Excess Na incorporation significantly expands the otherwise narrow air annealing temperature (AAT) window required fo...