Interfacial Modification of Mesoporous TiO(2) Films with PbI(2)-Ethanolamine-Dimethyl Sulfoxide Solution for CsPbIBr(2) Perovskite Solar Cells

As one of the most frequently-used electron-transporting materials, the mesoporous titanium dioxide (m-TiO(2)) film used in mesoporous structured perovskite solar cells (PSCs) can be employed for the scaffold of the perovskite film and as a pathway for electron transport, and the contact area between the perovskite and m-TiO(2) directly determines the comprehensive performance of the PSCs. Because of the substandard interface combining quality between the all-inorganic perovskite CsPbIBr(2) and m-TiO(2), the development of the mesoporous structured CsPbIBr(2) PSCs synthesized by the one-step method is severely limited. Here, we used a solution containing PbI(2), monoethanolamine (EA) and dimethyl sulfoxide (DMSO) (PED) as the interfacial modifier to enhance the contact area and modify the m-TiO(2)/CsPbIBr(2) contact characteristics. Comparatively, the performance of the solar device based on the PED-modified m-TiO(2) layer has improved considerably, and its power conversion efficiency is up to 6.39%.