Three cost-effective D-π-D hole transport materials (HTMs) with different π-bridge including biphenyl (SY1), phenanthrene (SY2) and pyrene (SY3) have been synthesized by one-pot reaction with cheap commercially available starting materials...
Harvesting hot carriers (HCs) before thermalizing to the perovskite crystal lattice is very promising for advancing the efficiency of perovskite solar cells (PSCs) towards the Shockley-Queisser limit. Thus, it is very crucial to slow down the HCs cooling process in lead halide perovskites. Herein, we investigated the HCs cooling dynamics of perovskite films in the presence of an organic small molecule, 2,5-thiophenedicarboxylic acid (TDCA). We found that adding TDCA into perovskite films can efficiently retard HCs cooling process, which favors extracting the excess energies of HCs through carrier transport layers and reducing electron-hole recombination, resulting in enhanced performance in TDCA modified device. Moreover, TDCA can effectively passivate unsaturated Pb 2+ defects of perovskite films while promoting a preferential crystal orientation. Consequently, the PSCs efficiency is enhanced to 22.85% (TDCA) from 19.96% (control). These findings provide important insight for understanding HCs transfer dynamics and developing nextgeneration perovskite-based HCs optoelectronic devices.
A novel modified glassy carbon electrode was prepared as an electrochemical voltammetric sensor based on molecularly imprinted polymer film for serotonin detection. The sensitive film was prepared by co-polymerization of 5-hydroxy tryptophan (5-HTP) and acrylamide (AM) on the carbon nanotubes modified glassy carbon electrode. The surface morphologies of the modified electrodes were characterized by scanning electron microscope. The electrochemical behavior of serotonin molecules on the imprinted electrode was studied by differential pulse voltammetry (DPV), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under the optimum conditions, the linear relationships between current and concentration were obtained in the range from 1.8 × 10 −6 to 5.4 × 10 −9 mol L −1 , with the linear regression equation Ip = 1.552 C + 8.778 × 10 −8 (I: μA, C: μmol L −1 ), correlation coefficient 0.9997. The detection limit of 1.8 × 10 −10 mol L −1 was achieved (S/N = 3). The applicability of the modified electrode was demonstrated by determination of serotonin in human serum. Moreover, the possible oxidation mechanism of 5-HT was discussed.
The title compound, C50H36N2, synthesized by the condensation reaction of 2-methyl-4,6-diphenylaniline and acenaphthylene-1,2-dione, crystallizes with two independent molecules (AandB) in the asymmetric unit. The two molecules differ essentially in the orientation of the phenyl ring at position 3′ of the terphenyl group with respect to the central ring of this unit. In moleculeAthis dihedral angle is 16.68 (14)°, while in moleculeBthe corresponding angle is 33.10 (16)°. The three-fused-ring 1,2-dihydroacenaphthylene units are planar in each molecule; r.m.s. deviation of 0.025 Å in moleculeAand 0.017 Å in moleculeB. The central rings of the terphenyl groups are almost normal to the mean plane of the three-fused-ring units with dihedral angles of 79.43 (12) and 82.66 (13)° in moleculeAand 88.99 (13) and 87.98 (12)° in moleculeB. In the crystal, the two molecules are linkedviaa C—H...N hydrogen bond. TheseA–Bunits are linked by a pair of C—H...π interactions, forming a four-molecule unit located about an inversion center. These four-molecule units are linked by weak π–π interactions [most significant intercentroid distance = 3.794 (2) Å], forming columns along direction [010]. A region of disordered electron density was corrected for using the SQUEEZE routine inPLATON[Spek (2015).Acta Cryst. C71, 9–18]. The formula mass and unit-cell characteristics of this unknown solvent were not be taken into account during the refinement.
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