Radically grown obelisk-like ZnO arrays for perovskite solar cell fibers and fabrics through a mild solution process

A general and effective strategy has been developed to fabricate both perovskite photovoltaic fibers and fabrics by synthesizing obelisk-like ZnO arrays to replace the TiO2 layer through a mild solution process. The obelisk-like ZnO aggregates were perpendicularly grown on substrates in an aligned format and with tunable sizes, offering many advantages, such as effective penetration of a second phase into the voids with a high stability. The perovskite photovoltaic fibers and fabrics can be twisted in three dimensions without obvious damage to the structure.