High-Performance Perovskite Single-Junction and Textured\nPerovskite/Silicon Tandem Solar Cells via Slot-Die-Coating

In\nthis work, we report perovskite solar cells in the planar p–i–n configuration based on single-step,\nanti-solvent-free, low-temperature (70 °C) slot-die-coated methylammonium\nlead tri-iodide (MAPbI3). The devices are fabricated on\nhydrophobic poly­(triarylamine)\n(PTAA) surfaces, using key strategies such as solvent engineering,\nenhanced ink–substrate dynamics, and surface passivation, enabling\na power conversion efficiency (PCE) of 21.8%. We also adapted the\ntechnique to achieve the first slot-die-coated perovskite/silicon\nmonolithic 2-terminal tandems, achieving a PCE of 23.8% utilizing\na textured silicon bottom cell.