Potassium Thiocyanate‐Assisted Enhancement of Slot‐Die‐Coated Perovskite Films for High‐Performance Solar Cells
byFuzong Xu, Jiang Liu, Anand S. Subbiah, Whenzu Liu, Jingxuan Kang, George T. Harrison, Xinbo Yang, Furkan H. Isikgor, Erkan Aydin, Michele De Bastiani, Stefaan De Wolf
F. Xu, Dr. J. Liu, Dr. A. S. Subbiah, Dr. W. Liu, J. Kang, Dr. G. T. Harrison,
Dr. X. Yang, Dr. F. H. Isikgor, Dr. E. Aydin, Dr. M. De Bastiani,
Prof. S. De Wolf (2021) Potassium Thiocyanate-Assisted Enhancement of Slot-Die-
Coated Perovskite Films for High-Performance Solar Cells, Small Science
The MAPbI3 polycrystalline films with 25.15um charge carrier diffusion length and grain size of 11 um are achieved by slot-die method assisted by KSCN. Based on the films, the planar solar cells with all layers being deposited by scalable methods achieve an efficiency of 21.38%.
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 (MAPbI3) perovskite films are dramatically improved via additive engineering using potassium thiocyanate (KSCN). The modified micrometer‐thick films have an average grain size of ≈11 μm and charge‐carrier parameters that are comparable with single‐crystal perovskites, such as a 1.89 μs lifetime, 136.65 ± 31.52 cm2 V−1 s−1 mobility, and 25.15 ± 3.55 μm 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.
hysteresis of perovskite solar cellsperovskite grainspotassium thiocyanate additiveslot-die coating