Open AccessPotassium Thiocyanate‐Assisted Enhancement of Slot‐Die‐Coated Perovskite Films for High‐Performance Solar Cells
Author(s) -
Xu Fuzong,
Liu Jiang,
Subbiah Anand S.,
Liu Wenzhu,
Kang Jingxuan,
Harrison George T.,
Yang Xinbo,
Isikgor Furkan H.,
Aydin Erkan,
De Bastiani Michele,
De Wolf Stefaan
Publication year - 2021
Publication title -
small science
Language(s) - English
Resource type - Journals
ISSN - 2688-4046
DOI - 10.1002/smsc.202000044
Subject(s) - materials science , perovskite (structure) , energy conversion efficiency , triiodide , spin coating , grain size , crystal (programming language) , perovskite solar cell , coating , optoelectronics , nanotechnology , chemical engineering , electrolyte , composite material , electrode , chemistry , dye sensitized solar cell , computer science , engineering , programming language
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 ≈11 μm and charge‐carrier parameters that are comparable with single‐crystal perovskites, such as a 1.89 μs lifetime, 136.65 ± 31.52 cm 2 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.