A bendable nickel oxide interfacial layerviapolydopamine crosslinking for flexible perovskite solar cells

Bendable nickel oxide (NiOx) was first fabricated via polydopamine (PDA) modification and applied as an interfacial layer in flexible perovskite solar cells. PDA cross-linked NiOx could release mechanical stress to eliminate the inherent brittleness of inorganic crystals, leading to a flexible device exhibit over 70% retention of efficiency after 1000 bending cycles.