Slot-die processed perovskite solar cells: effects of solvent and temperature on device performances

We studied the effects of perovskite precursor solvents and deposition temperatures on perovskite-layer formation for slot-die coating based solar cell fabrication. To select better solvent and temperature conditions, various representative polar solvents (dimethyl sulfoxide (DMSO), N-methyl-2-pyrrolidone, N,N-dimethylformamide (DMF), γ -butyrolactone) and various deposition temperatures (70 °C–150 °C), well-known as key conditions in conventional spin-coating systems, were studied and compared. Comparative studies revealed the DMSO:DMF (5:5) solvents and the 130 °C can provide better solar-cell performances with cell-efficiency up to 15.40% in slot-die based planar perovskite devices, demonstrating an advanced step for better-efficiency slot-die-coating based perovskite solar cells.