Ph-4PACz, Hole transport or extraction layer for p-i-n and large area perovskite solar cells, (4-(3,6-diphenyl-9H-carbazol-9-yl) butyl)phosphonic acid, CAS No. 2814500-04-2Ph-4PACz, featuring a rotatory phenyl group, aims to enhance steric hindrance and diminish the intermolecular ...