For a high efficiency of planar-type perovskite solar cells, a good crystallization and high surface coverage of the absorber films are required. However, these two key factors are still the main challenges in perovskite film formation to date. Here, 1-chloronaphthalene (CN) is used as a solvent-additive in the precursor HC(NH2)2PbI3 (FAPbI3) solution to control the crystallization and surface coverage of the FAPbI3 films by adjusting its concentration. The CN chlorinated monodentate ligand is likely to temporarily chelate with Pb2+ during the crystal growth, facilitating homogenous nucleation to form relatively high quality FAPbI3 films. Meanwhile, the CN additive with a high boiling point delays the growth rate of the FAPbI3 film, which helps to form homogenous continuous FAPbI3 films with fewer pin-holes. As a result, with the addition of the CN solvent-additive, the efficiency of the FAPbI3 planar-type solar cells is enhanced to 16.53%.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)