Photostability and Moisture Stability of CH NH PbI -based Solar Cells by Ethyl Cellulose.

Organic-inorganic hybrid perovskite solar cells have achieved high power conversion efficiencies (PCE) of around 22 %, comparable to conventional silicon and thin-film solar cells. However, the poor stability of the perovskite material is one of the significant drawbacks for its practical application. In moderate humidity, the perovskite hydrates and decomposes within hours or a few days, which deteriorates the device efficiency rapidly.

Elucidating the reaction pathways in the synthesis of organolead trihalide perovskite for high-performance solar cells.

The past two years have witnessed unprecedentedly rapid development of organic-inorganic halide perovskite-based solar cells. The solution-processability and high efficiency make this technology extraordinarily attractive. The intensive investigations have accumulated rich experiences in the perovskite fabrication; while the mechanism of the chemical synthesis still remains unresolved.

Few-layer MoSe₂ possessing high catalytic activity towards iodide/tri-iodide redox shuttles.

Due to the two-dimensional confinement of electrons, single- and few-layer MoSe₂ nanostructures exhibit unusual optical and electrical properties and have found wide applications in catalytic hydrogen evolution reaction, field effect transistor, electrochemical intercalation, and so on. Here we present a new application in dye-sensitized solar cell as catalyst for the reduction of I₃(-) to I(-) at the counter electrode. The few-layer MoSe₂ is fabricated by surface selenization of Mo-coated soda-lime glass.

Cross-linked conjugated polymers for achieving patterned three-color and blue polymer light-emitting diodes with multi-layer structures.

Reactions between the ethylene groups in the backbone of conjugated polymers under UV illumination and heat treatment result in the cross-linking of the main polymer chains. The cross-linking leads to two simultaneous results in the polymer: excellent solvent resistance and increased bandgap. Using this reaction, three-color polymer light-emitting diodes (PLEDs) with a multi-layer structure can be easily realized by a dry photo-pattern in an active-gas-free environment.

Self-assembled monolayers of aromatic thiols stabilized by parallel-displaced pi-pi stacking interactions.

Parallel-displaced pi-pi stacking interactions have been known to be the dominant force in stabilizing the double helical structure of DNA and the tertiary structure of proteins. However, little is known about their roles in self-assembled monolayers of other large pi molecules such as aromatic thiols. Here we report on a systematic study of the self-assembled monolayers of four kinds of anthracene-based thiols, 9-mercaptoanthracene (MA), (4-mercaptophenyl) (9-anthryl) acetylene (MPAA), (4-mercaptophenyl) (10-nitro-9-anthryl) acetylene (MPNAA), and (4-mercaptophenyl) (10-carboxyl-9-anthryl) acetylene (MPCAA) on Au(111), in which a spacer and different functional groups (NO2 and COOH) are intentionally designed to introduce and thus allow the investigation of various intermolecular interactions, in addition to pi-pi interactions in the base molecules.