Study on photovoltaic stability and performance by incorporating tetrabutyl phosphonium iodide into the active layer of a perovskite type photovoltaic cell.

A simple synthesis of an ionic liquid is carried out using a trialkylphosphine and an alkyl halide. The results showed that the quality of perovskite crystals is enhanced by the incorporation of BPI, when the percentage is 1.5% the PCE of champion PSCs MA(BPI)PbI increases significantly from 15.

Study of the Coordination Modes of Hybrid NNCp Cyclopentadienyl/Scorpionate Ligands in Ir Compounds.

A new coordination mode for the hybrid scorpionate/cyclopentadienyl ligand bpzcp, [bpzcp = 2,2-bis(3,5-dimethylpyrazol-1-yl)-1,1-diphenylethylcyclopentadienyl] is observed in iridium complexes. The reaction of the lithium precursor, [Li(bpzcp)(THF)], with a range of [IrCl(diene)] compounds leads to an unprecedented binding mode of the hybrid scorpionate/cyclopentadienyl ligand as η-Cp-coordinated and the formation of Ir(I) derivatives [Ir(η-Cp-bpzcp)(η-cod)] (1), [Ir(η-Cp-bpzcp){η-CH═C(Me)C(Me)═CH}] (2), [Ir(η-Cp-bpzcp)(η-coe)] (3), and [Ir(η-Cp-bpzcp)(η-CH═CH)] (4). The Ir(I) complex 4 reacts with CO or bromine to afford the compound [Ir(η-Cp-bpzcp)(CO)] (5) and the 18e Ir(III) complex [Ir(κ-N-η-Cp-bpzcpBr)Br] (6), respectively.

Small Molecules Derived from Thieno[3,4-c]pyrrole-4,6-dione (TPD) and Their Use in Solution Processed Organic Solar Cells.

In this work, microwave synthesis, chemical, optical and electrochemical characterization of three small organic molecules, , and with donor-acceptor structure and their use in organic photovoltaic cells are reported. For the synthesis, 5-(2-ethylhexyl)-4-thieno[3,4-]pyrrole-4,6(5)-dione was used as electron withdrawing fragment while the triphenylamine was used as electron donating fragment. Molecular electronic geometry and electronic distribution density were established by density functional theory (DFT) calculations and confirmed by optical and chemical characterization.

Isotropic rotation in amphidynamic crystals of stacked carbazole-based rotors featuring halogen-bonded stators.

Liquid-like dynamics of a covalent 1,4-phenylene rotator have been unveiled in 1 with a brominated stator showing type-II halogen bonds. This singular rotation is favored by synergistic molecular changes in stacked molecules, according to VT solid state NMR, H T relaxometry and VT X-ray experiments of this highly crystalline compound.