Slot-die coated methylammonium-free perovskite solar cells with 18% efficiency

Mathilde Fievez,1 Prem Jyoti Singh Rana,1 Teck Ming Koh, Matthieu Manceau, Jia Haur Lew, Nur Fadilah Jamaludin, Biplab Ghosh, Annalisa Bruno, Stéphane Cros, Solenn Berson, Subodh Mhaisalkar, Wei Lin Leong∗

(1:These authors contributed equally to this work)

https://www.sciencedirect.com/science/article/pii/S0927024821002324

One of the major bottlenecks of perovskite photovoltaic modules fabrication is the homogeneous deposition of perovskite material on large-area substrates. Here, we show that slot-die coating technique combined with synergistic gas quenching and substrate heating can produce compact, homogenous and reproducible Cs0.16FA0.84Pb(I0·88Br0.12)3 perovskite films. We demonstrate the fabrication of perovskite solar cells (PSCs) in a planar (n-i-p) device configuration and attain power conversion efficiency (PCE) of 18% over 0.09 cm 2 device active area. The versatility of this crystallization strategy, which eliminates the need for complex solvents or additive engineering, was studied using planar SnO2- and TiO2-coated FTO substrates. Our study provides greater insights into achieving controlled coating and homogeneous crystallization of perovskite films over large-area substrates (~10 × 10 cm 2) necessary for the commercialization of this technology.