Fully Inkjet‐Printed Green‐Emitting PEDOT:PSS/NiO/Colloidal CsPbBr₃/SnO₂ Perovskite Light‐Emitting Diode on Rigid and Flexible Substrates

Abstract

After establishing themselves as promising active materials in the field of solar cells, halide perovskites are currently being explored for fabrication of low‐cost, easily processable and highly efficient light emitting diodes (LEDs). Despite this, the highest efficiencies reported for perovskite‐based LEDs (PeLEDs) have been achieved through spin‐coating or vacuum evaporation deposition techniques, which are not adequate, in most of the cases, for an industrial scale production. Additionally, the long‐term stability is still a big handicap, even though all inorganic perovskites, such as CsPbBr3, are found to be more stable to external variables. In this context, herein we report on the fabrication of fully inkjet‐printed (IJP) CsPbBr3‐based PeLEDs in ambient conditions, on rigid and flexible substrates, on a proof‐of‐concept basis, with the successful incorporation of NiO and SnO2 as hole and electron selective contacts, respectively. Despite the moderate luminance (324 cd/m2) value obtained, this result pave the way towards the development of up‐scalable fabrication of PeLEDs based on deposition techniques with controlled spatial resolution.This article is protected by copyright. All rights reserved.

Transferred Metal Electrodes for Perovskite Solar Cells with Doping‐Tuned Hole‐Transporting Layer

“…[6] These factors greatly increase the manufacturing cost and time consumption of PSCs, severely impeding their largescale production and application. [7][8][9] Therefore, in terms of electrode materials, inexpensive metals, conductive carbon materials, and conductive polymers have been used to prepare the top electrodes. [10,11] In addition, in terms of the preparation process, researchers have tried conductive pastes/inks and corresponding solution processes such as printing and spraying to prepare top electrodes of PSCs to get rid of the reliance on vapor deposition systems.…”

Low-Temperature Annealing of Inkjet-Printed CsPbBr3 Perovskite Nanocrystal Film for Light-Emitting Diodes

“…Metal halide perovskite materials, such as bulk film, quasi-two-dimensional (quasi-2D), nanocrystals (NCs), have garnered significant attention as promising candidates for solution-processed light-emitting diodes (LEDs) owing to their exceptional photoluminescence quantum yield (PLQY) and excellent color purity across the visible-to-near-infrared spectrum. − Inkjet printing has emerged as a promising solution process for fabricating quantum dot (QD)-based optoelectrical optoelectronic and perovskite NC-LEDs, and quasi-2D perovskite LEDs due to the small-pixel size and on-demand patterning without mask-free techniques, crucial for the display application. − This method allows for film deposition using significantly less ink compared to the spin-coating process, leading to cost reduction and an environmentally friendly process. − Inkjet-printed quasi-2D perovskite LEDs have been fabricated using metal halide precursor solutions. ,− Precursor solutions comprise metal halide and ammonium halide spacer cations dissolved in a polar solvent such as dimethyl sulfoxide (DMSO). The metal halide precursor solutions are converted to quasi-2D perovskite film during solvent evaporation after the annealing process.…”