Fabrication and Characterization of Autonomously Self‐Healable and Stretchable Soft Microfluidics

Wang, Hualong; Vu, Susanna; Pignanelli, Julia; Fatah, Tamer Abdel; Trant, John F.; Mahshid, Sara; Ahamed, Mohammed Jalal

doi:10.1002/adsu.202100074

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…We anticipate this synchronous strategy will contribute to the rational control of surface defects via multiple interaction of NaDDTC for achieving both low defect density and stable inorganic perovskite, which would significantly improve performance when applied to future high-performance analogous perovskite optoelectronics or other electronics technologies. [62,63]…”

Section: Discussionmentioning

confidence: 99%

Synchronous Surface Reconstruction and Defect Passivation for High‐Performance Inorganic Perovskite Solar Cells

Zhang

Tian

et al. 2022

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commercialization due to ever-increasing power conversion efficiency (PCE), which has soared to 25.7% as of 2022. [1][2][3][4] Nonetheless, the inadequate stability caused by thermal degradation of hybrid perovskite still poses a great challenge for commercialization. [5] To circumvent this concern, all-inorganic cesium lead halide perovskites (CsPbX 3 , X = Br, I), whose volatile and vulnerable organic parts can be replaced by stable inorganic Cs + , have attracted considerable attention and exhibited great potential for both high-performance single-junction and top cells in tandem soar cells due to their unparalleled stability at high temperature. [6][7][8] In recent years, thanks to a lot of research work and incisive investigation, cesium-based inorganic perovskites have made remarkable progress in reducing the defect densities and stabilizing the black phase in the perovskite films, due especially to precursor solution optimization, [9][10][11][12] compositional engineering, [13][14][15] interface modification [16][17][18][19] and strain engineering. [6,20] Despite these unremitting efforts, the current record PCE is considerably lower than that of its hybrid counterpart and the Shockley-Queisser (S-Q) limit (≈30%). [21] This shortcoming is ascribed to a large energy loss (E loss ), suggesting that severe Shockley-Read-Hall recombination occurs in the interface or absorber layer in these solar cells, which is mainly attributed to the inevitable formation of a large number of shallow-or deeplevel defects in the crystal growth of CsPbI 3−x Br x film. [21][22][23] These undesirable defects, especially deep-level defects, are considered as nonradiative recombination centers and active sites for water adsorption. As a result, they tend to cause inferior device performance and long-term instability. [24] Thus, it is of great significance to prepare superior perovskite films with low-defect density for obtaining high-efficiency solar cells.Recently, intensive research on the deep-level physical mechanism of inorganic perovskite has led to improvements of the efficiency and stability of inorganic perovskite devices. [25][26][27][28] Lou et al. demonstrated the there are many point defects in inorganic perovskite, such as the Cs + vacancy (V Cs ) and undercoordinated Pb 2+ , etc. These inevitable defects can impair the interaction between Cs + and [PbI 6 ] 4− octahedra to some extent, thus reducing the energy difference between the black phase and yellow phase. [24,25] According to density functional theoryThe nonradiative charge recombination caused by surface defects and inferior crystalline quality are major roadblocks to further enhancing the performance of CsPbI 3−x Br x perovskite solar cells (PSCs). Theoretical calculations indicate that sodium diethyldithiocarbamate (NaDDTC), a popular bacteriostatic benign material, can initiate multiple interactions with the CsPbI 3−x Br x perovskite surface to effectively passivate the defects. The experimental results reveal that the NaDDTC can indeed passivate the elect...

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Section: Discussionmentioning

confidence: 99%

Synchronous Surface Reconstruction and Defect Passivation for High‐Performance Inorganic Perovskite Solar Cells

Zhang

Tian

et al. 2022

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“…• Surface tension/interfacial tension modulation for flow (regime) control and fluid mixing (Diguet et al, 2011;Venancio-Marques et al, 2013). • Self-healing channels walls (Wang et al, 2022).…”

Section: Strategies For Extending Biochemical Sensor Lifetimementioning

confidence: 99%

Sensors and “The internet of biochemical things”

Florea

Diamond²

2022

Front. Sens.

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In this perspective article, we consider the pathway biochemical sensing will take as the huge businesses underpinning Big Data and the Internet of Things seek new layers of highly valuable information to integrate into our increasingly digitised world. Up to now, the complexity of biochemical sensing has limited its inclusion in a manner similar to more reliable and lower cost technologies based on physical transducers. At its core, this complexity arises from the fundamental need for biochemical sensors to interact intimately at the molecular level with one or more specific components (analytes) in samples that are often highly complex and hostile to the sensors. This limits the functional lifetime of biochemical sensors to at best days or weeks or most commonly single use, making long-term embedded use-models developed for Internet of Things applications beyond reach. Nevertheless, even single use sensors can lead to “big data”, if used in large enough scale (e.g., COVID-19 diagnostics), and progress in continuous is beginning to make headway towards longer-term use models in health and environmental monitoring. New concepts exploiting advanced materials and biomimetic concepts offer opportunities to further extend the lifetime of biochemical sensing devices.

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“…The development of stretchable microfluidic chips has gained significant attention due to their advantages in providing innovative solutions for flexible and adaptable biomedical devices [ 34 , 35 ]. For instance, hydrodynamic manipulation in microfluidics can effectively separate particles by size, and when coupled with external mechanical tuning, can enhance separation performance [ 36 , 37 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Accurate Pneumatically Tunable Optofluidic Distributed Feedback Dye Lasers

Feng,

Zhang,

Shu

et al. 2023

Micromachines

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Optofluidic dye lasers integrated into microfluidic chips are promising miniature coherent light sources for biosensing. However, achieving the accurate and efficient tuning of lasers remains challenging. This study introduces a novel pneumatically tunable optofluidic distributed feedback (DFB) dye laser in a multilayer microfluidic chip. The dye laser device integrates microfluidic channels, grating structures, and vacuum chambers. A second-order DFB grating configuration is utilized to ensure single-mode lasing. The application of vacuum pressure to the chambers stretches the soft grating layer, enabling the sensitive tuning of the lasing wavelength at a high resolution of 0.25 nm within a 7.84 nm range. The precise control of pressure and laser tuning is achieved through an electronic regulator. Additionally, the integrated microfluidic channels and optimized waveguide structure facilitate efficient dye excitation, resulting in a low pump threshold of 164 nJ/pulse. This pneumatically tunable optofluidic DFB laser, with its high-resolution wavelength tuning range, offers new possibilities for the development of integrated portable devices for biosensing and spectroscopy.

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Fabrication and Characterization of Autonomously Self‐Healable and Stretchable Soft Microfluidics

Cited by 6 publications

References 47 publications

Synchronous Surface Reconstruction and Defect Passivation for High‐Performance Inorganic Perovskite Solar Cells

Synchronous Surface Reconstruction and Defect Passivation for High‐Performance Inorganic Perovskite Solar Cells

Sensors and “The internet of biochemical things”

Highly Accurate Pneumatically Tunable Optofluidic Distributed Feedback Dye Lasers

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