Applied Surface Science, Vol.416, 96-102, 2017
Infiltration of methylammonium metal halide in highly porous membranes using sol-gel-derived coating method
Organic-inorganic halide perovskites (OIHPs) has emerged as promising optoelectronic materials for solar cells and light-emitting diodes. OIHPs are usually coated on a flat surface or mesoporous scaffold for the applications. Herein, we report a facile sol-gel-derived solution route for coating methylammonium lead iodide (MAPbI(3)) perovskite layers onto various nanoporous structures. We found that lead-acetate solution has superior infiltration property onto surface of oxide membranes, and it can easily be converted to MAPbI(3) by sequential transform to PbO, PbI2, and finally MAPbI(3). Excellent pore-filling and full coverage of the nanostructures with the final MAPbI(3) perovskite material are demonstrated via this sol-gel-derived solution route, using mesoporous TiO2, TiO2 nanorods, and high-aspect ratio nanopores in anodic aluminum oxide membranes. Given that this sol-gel-based method fills nanopores better than other conventional coating methods for OIHPs, this method may find wide applications in nanostructured OIHPs-based optoelectronic systems. (C) 2017 Elsevier B.V. All rights reserved.