Abstract
Slot-die coating is highly promising for scaled deposition of metal halide perovskite thin films. However, the power conversion efficiencies (PCEs) of slot-die-prepared perovskite solar cells (PSCs) still lag behind their spin-casted counterparts. To resolve this issue, the crystal size and quality of slot-die-coated methylammonium lead triiodide (MAPbI(3)) perovskite films are dramatically improved via additive engineering using potassium thiocyanate (KSCN). The modified micrometer-thick films have an average grain size of approximate to 11 mu m and charge-carrier parameters that are comparable with single-crystal perovskites, such as a 1.89 mu s lifetime, 136.65 +/- 31.52cm(2)V(-1)s(-1) mobility, and 25.15 +/- 3.55 mu m diffusion length. Exploiting these enhanced properties, planar inverted PSCs with negligible hysteresis are fabricated and an average and a maximum PCE of 20.14% and 21.38%, respectively, are achieved which are among the highest reported values for slot-die-coated PSCs. Notably, our devices have a narrow PCE distribution along the slot-die coating axis, highlighting slot-die coating's promise to fabricate large-scale, high-performance PSCs.