DOI: https://doi.org/10.29363/nanoge.emlem.2022.046
Publication date: 15th July 2022
The development of metal-halide perovskite-based optoelectronic devices continues to reach new record efficiencies and operation lifetimes. While most of the device fabrication is still done by spin-coating of a previous-prepared precursor solution, inkjet printing was already used for the fabrication of solar cells and light emitting diodes.[1] Beyond scalable, high‑throughput and large‑area coating, inkjet printing also enables variation of the deposited material during processing.
Using combinatorial inkjet printing, multiple precursor inks can be deposited in a single printing step to achieve compositionally mixed perovskite thin films and gradients. The composition of the resulting film can thereby be precisely controlled by adjusting the droplet ratio of both inks during the printing process. A pre-made image, fed into the printer, allows thereby to produce arbitrary patterns of metal halide perovskite film with compositional gradients.[2] Beyond being a powerful tool for high-throughput material discovery, we demonstrate the direct use of combinatorial inkjet printing for device fabrication. Utilizing methylammonium lead iodide, bromide and chloride inks, we fabricated a series of MAPb(IxBr1-x)3 and MAPb(BrxCl1-x)3 thin films. The well-known gradient of the bandgap energy in this series allowed us to produce a series of wavelength-selective photodetectors, covering the whole spectrum of visible light from 1.6 eV (MAPbI3) to 3.0 eV (MAPbCl3) in a single printing step.[3]
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