Monodentate versus Bidentate Anchoring Groups in Self-Assembling Molecules (SAMs) for Robust p-i-n Perovskite Solar Cells.

Current improvement in perovskite solar cells (PSCs) has been achieved by interface engineering and fine-tuning of charge-selective contacts. In this work, we report three novel molecules that can form self-assembled layers (SAMs) as an alternative to the most commonly used p-type contact material, PTAA. Two of these molecules have bidentate anchoring groups (MC-54 and MC-55), while the last one is monodentate (MC-45).

Structure-Property Relationship in Amber Color Light-Emitting Electrochemical Cell with TFSI Counteranion: Enhancing Device Performance by Different Substituents on NN Ligand.

Amber color emitting novel Ir(III) complexes were synthesized: [Ir(Meppy)(Fpbpy)][PF] (PF), [Ir(Meppy)(Fpbpy)][TFSI] (TFSI), [Ir(Meppy)(MeObpy)][PF] (PF) and [Ir(Meppy)(MeObpy)][TFSI] (TFSI), where Meppy = 2-(-methylphenyl)-pyridine (), Fpbpy = 4,4'-bis(4-fluorophenyl)-2,2'-bipyridine (), and MeObpy = 4,4'-bis(4-methoxy)-2,2'-bipyridine (). The photophysical and X-ray results showed that the complexes have aggregation-induced phosphorescent emission (AIPE) and a salt-induced polymorphism effect. The highest photoluminescence intensity was observed in complex TFSI compared to other complexes in the solid state.

Development and application of a low-cost smartphone-based turbidimeter using scattered light.

We demonstrate the development and application of a low-cost smartphone turbidimeter system to be used on water samples collected from natural resources. The proposed system depends on the spectroscopic measurements of both forward- and side-scattered light. A custom-designed cradle was fabricated using 3D printing, and plastic optical fibers were used to couple light from the smartphone's built-in flash and transmit the collected scattered light to the camera sensor.