[MAT-05]Pickering high internal phase emulsions (HIPEs) templated super-hydrophobic-oleophilic elastic foams for highly efficient oil/water separation

Highly porous and elastic poly (butyl acrylate)-polydimethylsiloxane (PBA-PDMS)-based foams with superhydrophobic and superoleophilic properties, controllable pore structure, adjustable surface and mechanical properties are fabricated by templating water-in-oil (w/o) Pickering high internal phase emulsions. The prepared foam materials display excellent water-repellent, self-cleaning, oil absorbing behavior, and can be recycled and reused directly, making them suitable for highly efficient oil/water separation and industrial water purification.

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[MAT-04]Coating two-dimensional MoS2 with polymer creates a corrosive non-uniform interface

Two-dimensional (2D) materials and soft materials are both susceptible to mechanical instabilities, such as buckling, wrinkling, folding and creasing, especially when located on surfaces. Here, we report that weak van der Waals interactions cause the interface between 2D molybdenum disulphide (MoS2) and a soft poly(methyl methacrylate) coating to demonstrate mechanical instability and delamination. The resulting non-uniform and buckled interface greatly hampers the ability of the coating to protect the MoS2 substrate. Also, the corrosion rate of 2D MoS2 and quench rate of intrinsic luminescence in 2D MoS2 were significantly accelerated by the soft coating. Owing to the formation of corrosive cavities at the interface, the geometry and size of the flakes became the dominating factor, and a critical size of 2D flakes for such interfacial instability was determined based on elasticity theory. Such hazardous corrosion in a 2D material caused by a soft coating raises concern for their use in electronic packaging, and for the processing of van der Waals-layered materials for future applications.

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[MAT-03]Interfacial modification through a multifunctional molecule for inorganic perovskite solar cells with over 18% efficiency

One multifunctional molecule 5-Amino-2,4,6-triiodoisophthalic acid (ATPA) was employed as interfacial layer between CsPbI3 and TiO2. The ATPA not only results in cascade energy level alignment, but also interacts strongly with CsPbI3 layer and effectively passivates the defects. The optimized devices based the ATPA modified CsPbI3 deliver a high efficiency of 18.12% with excellent stability.

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[MAT-02]Vertical orientated Dion–Jacobson quasi‐2D perovskite film with improved photovoltaic performance and stability

This work employed NH4SCN additive to facilitate the orientation of perovskite crystal growth to be perpendicular to the substrate and narrowed the layer number distribution to around n = 3 and n = 4. The device derived from the quasi‐2D DJ (BDA)(MA)4Pb5I16 perovskite film processed with NH4SCN shows a PCE of 14.53%, which is among the highest values reported for 2D PVSCs prepared at room temperature. Moreover, the device retains 85% of its initial PCE after 900 h storage in ambient conditions with a humidity level of 50 ± 5%.

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[MAT-01]Dopant‐free crossconjugated hole‐transporting polymers for highly efficient perovskite solar cells

Two isomeric crossconjugated polymer hole-transporting materials (HTMs) are developed to demonstrate significantly distinct device power conversion efficiencies (PCEs) under the same device fabrication conditions, 11.1% PPE1 while 19.3% for PPE2, which is found to be due to the improved quality of perovskite films made on top of PPE2. More excitingly, the PPE2-based perovskite solar cells (PVSCs) can further achieve a more impressive PCE of 21.3% through suitable surface passivation.

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