High‐Resolution Multicolor Patterning of Metal Halide Perovskite Nanocrystal Thin Films through Rapid‐Evaporation‐Assisted Strategy

Ahn, Jungkyu; Lee, Yong Min; Jeon, Joongoo; Bang, Junsung; Jeon, Sanghyun; Woo, Ho Kun; Lee, Sang Yeop; Bae, Jung Ho; Kim, W.; Choi, Young Don; Kim, Sung Joong; Oh, Soong Ju

doi:10.1002/admt.202200031

Cited by 8 publications

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“…1 b, middle), whereas the alternate printing mode exhibited periodic circular patterns with overlapping ends (Fig. 1 b, right); this behavior was attributed to rapid evaporation (< 0.5 ms) [ 26 ]. As the pre-extracted droplets completely evaporated prior to subsequent extraction, the ring-shaped contact line was pinned to the substrate.…”

Section: Resultsmentioning

confidence: 99%

Ink-lithographic fabrication of silver-nanocrystal-based multiaxial strain gauge sensors through the coffee-ring effect for voice recognition applications

et al. 2022

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Human voice recognition techniques have remarkable potential for clinical applications because information from acoustic signals can reflect human body conditions. This paper reports the fabrication of Ag nanocrystal (NC)-based multiaxial wearable strain gauge sensors by ink-lithography for voice recognition systems. Benefiting from the one-step-device-fabrication strategy of ink-lithography, which can yield Ag NC patterns with specific dimensions and endow physical properties, the Ag NC-based multiaxial strain sensors can be fabricated on an ultrathin substrate (~ 6 μm). Additionally, the coffee-ring effect can be induced onto the Ag NC patterns to realize high sensitivity and angle dependence (gauge factors $${G}_{0^\circ }$$ G 0 ∘ = 11.7 ± 1.2 and $${G}_{90^\circ }$$ G 90 ∘ = 105.5 ± 20.1); moreover, the voice onset time for voice recognition can be detected by the sensors. These features assist in distinguishing between voiced and voiceless plosive contrasts via measurements of contact-based voice onset time differences and can act as a cornerstone for further advancements in wearable sensors as well as voice recognition and analysis. Graphical Abstract

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Section: Resultsmentioning

confidence: 99%

Ink-lithographic fabrication of silver-nanocrystal-based multiaxial strain gauge sensors through the coffee-ring effect for voice recognition applications

et al. 2022

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Laser‐Triggered Vapor‐Phase Anion Exchange on All‐Inorganic Perovskites for Multicolor Patterns and Microfabrications

Sheng

Zha

Feng

et al. 2022

Advanced Optical Materials

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such as high photoluminescence (PL) quantum yield (QY), [1][2][3] high defect tolerance, [4] high absorption coefficient, [5,6] long carrier diffusion lengths, [7,8] and tunable bandgaps. [9,10] These excellent properties greatly boost their applications in solar cells (SCs), [11,12] light-emitting diodes (LEDs), [13,14] photodetectors, [15,16] and lasers. [17,18] Besides, the bandgaps, so as the emission wavelengths of perovskites can be adjusted to cover the entire visible spectrum (400-700 nm) by changing the halide compositions, facilitating optoelectronic applications in a variety of areas. Very interesting, the halide compositions cannot only be tuned during synthesis but also can be changed by post-treatment due to the soft lattice, high mobility of halide ions, and low formation energy of different halide compositions. [19,20] Therefore, various post-treatments are developed to induce anion exchange process so that to modulate the bandgaps of perovskites. [21][22][23] For example, [23] anion exchange reactions were conducted by adding alkyl ammonium iodine salt and aryl ammonium iodine salt into the CsPbBr 3 perovskite quantum dots (QDs). Compared with the CsPb(Br x I 1-x ) 3 QDs synthesized by direct hot-injection, the CsPb(Br x I 1-x ) 3 QDs obtained by anion exchange possessed higher PLQY, and the corresponding LEDs exhibited a high external quantum efficiency of 21.3%, the improved stability, and the higher color purity. Therefore, the anion exchange cannot only conveniently change the bandgaps of perovskites but also improve their PLQY and stability through a simple post-treatment.Currently, the anion exchange is normally conducted by introducing different halide sources into perovskite nanocrystals (PNCs) solutions. Thus, heating is required to dissolve the additives and further purification is needed. [10,23,24] In addition, the chlorine-based halide salts have low solubility in N,Ndimethylformamide (DMF) and dimethylsulfoxide solvents, limiting the preparation of high-quality blue-emitting perovskite films. [25,26] More seriously, solution-phase anion exchange (SAE) is difficult to target on selected area of perovskite films at a high spatial resolution, hindering their applications in fabricating multicolor fluorescent patterns at microscale. The vaporphase anion exchange (VAE) cannot only tune the emission Anion exchange reaction is a facile postsynthesis approach to modulate the bandgaps of perovskites to meet the demands in full visible spectrum. However, conventional anion exchanges are usually conducted in solutions, limiting their applications in fabricating high-quality blue-emitting perovskites and multicolor fluorescent patterns. Herein, a laser-triggered vapor-phase anion exchange (LTVAE) method is developed to convert CsPbBr 3 perovskites with different morphologies (nanocrystal films/solution, microcrystals, and microplatelets) into CsPb(Br x Cl 1-x ) 3 and CsPb(Br x I 1-x ) 3 perovskites. Thus, the green fluorescence is converted into blue and red fluorescence. Moreover, the deep-blu...

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Anion Exchange Reaction of CsPbBr₃ Perovskite Nanocrystals: Affinity of Halide Ion Matters

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The affinity of chloride/iodide ions to replace the lattice sites of bromide ions in the CsPbBr3 nanocrystals by anion exchange reactions is investigated. In the presence of an equal number of iodide and chloride ions, the absorption and emission of lead halide perovskites are found to be red‐shifted as a result of the preferential anion exchange with the iodide ions. In order to initiate the anion exchange reactions with the chloride ions from a mixture of chloride and iodide ions, a minimum of 66 % of chloride ions, is essential to observe a significant change. The differential affinity of chloride/iodide ions to substitute bromide ions in CsPbBr3 perovskite is also substantiated using density functional theory (DFT) calculation. Understanding the interactions in the crystal structure of lead halide perovskites can give directions to tune the material properties in the nanoscale for various applications in science and technology.

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High‐Resolution Multicolor Patterning of Metal Halide Perovskite Nanocrystal Thin Films through Rapid‐Evaporation‐Assisted Strategy

Abstract: Figure 1. Schematic of process of multicolor patterning and principle of anion exchange during the procedure.

Cited by 8 publications

References 38 publications

Ink-lithographic fabrication of silver-nanocrystal-based multiaxial strain gauge sensors through the coffee-ring effect for voice recognition applications

Ink-lithographic fabrication of silver-nanocrystal-based multiaxial strain gauge sensors through the coffee-ring effect for voice recognition applications

Laser‐Triggered Vapor‐Phase Anion Exchange on All‐Inorganic Perovskites for Multicolor Patterns and Microfabrications

Anion Exchange Reaction of CsPbBr₃ Perovskite Nanocrystals: Affinity of Halide Ion Matters

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High‐Resolution Multicolor Patterning of Metal Halide Perovskite Nanocrystal Thin Films through Rapid‐Evaporation‐Assisted Strategy

Abstract: Figure 1. Schematic of process of multicolor patterning and principle of anion exchange during the procedure.

Cited by 8 publications

References 38 publications

Ink-lithographic fabrication of silver-nanocrystal-based multiaxial strain gauge sensors through the coffee-ring effect for voice recognition applications

Ink-lithographic fabrication of silver-nanocrystal-based multiaxial strain gauge sensors through the coffee-ring effect for voice recognition applications

Laser‐Triggered Vapor‐Phase Anion Exchange on All‐Inorganic Perovskites for Multicolor Patterns and Microfabrications

Anion Exchange Reaction of CsPbBr3 Perovskite Nanocrystals: Affinity of Halide Ion Matters

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Anion Exchange Reaction of CsPbBr₃ Perovskite Nanocrystals: Affinity of Halide Ion Matters