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A 2D perovskite incorporating an amine moiety with a carboxy group exhibited orientation changes as the amount of DMSO additive varied. The degree of perpendicular orientation was increased by optimizing the amount of DMSO additive, while using the bar-coating method. Moreover, film thickness and the ratio of perpendicular orientation exhibited a positive correlation. [ABSTRACT FROM AUTHOR]

Lead halide-based layered perovskites, (H3N-CnH2n,-NH3)PbX4 (X: I, Br), have attracted much attention because of their exceptional properties and quantum well structure. The tunable optical properties and high crystallinilty of n-conjugated oligomers make them promising candidates as advanced materials for the optelectronic applications. In this study, n-conjugated oligomer derivatives, 4,4'-bis-[5-(2-aminoethyl)thienyl]biphenylene hydrohalides (AETP.HX; X=Br and I) and 2,7-bis-[5-(2-aminoethyl}thienyl]-9H-fluorene dihydrohalides (AETF-HX; H = I), were incorporated into the organic layer of the layered perovskites, as shown by the XRD profile pf hybrid films. The UV-vis absorption spectra of the oligomers were not dependent on the halogen. The specta of the (AETP) Pbl4 and (AETF) Pbh films showed a sharp and intense absorption at 516 nm and 514 nm, respectively, while the (AETP)PbBr4 film exhibited an absorption peak at 400 nm. In the photoluminescence spectrum of the (AETP)PbL film, an exciton emission at 516 nm was observed. On the contrary, (AETP) PbBr4 and (AETF)PbI4 films showed characteristic peaks at other wavelengths. These results suggest that a novel energey interaction between organic and inorganic layers was formed in the layered perovskite films. [ABSTRACT FROM AUTHOR]

Organic-inorganic semiconductor heterostructures have been successfully fabricated by incorporating a polydiacetylene backbone into layered perovskite compounds by photopolymerization. The γ-ray irradiation caused polymerization of aminodiacetylene cations, RNH 3 + , where R=CH 3 (CH 2 ) 13 C≡C-C≡CCH 2 , in the solid salts of (RNH 3 ) 2 PbBr 4 . Layered Perovskite Photopolymerization Quantum-well [ABSTRACT FROM AUTHOR]

A low-dimensional organic-inorganic perovskite compound, (C4H8N2H4)2PbBr6·2H2O, was synthesized from cyclic amines and PbBr2 by using a hydrothermal reaction. The versatile optical properties caused by the quantum confinement structure were investigated. [ABSTRACT FROM AUTHOR]

We demonstrate efficiency enhancement in perovskite solar cells (PSCs) utilizing a free-dopant hole transporting material (HTM), non-peripherally substituted octapentyl phthalocyanine (C5PcH 2 ) with thermal annealing. Particularly, by using thermal annealing approach, the external quantum efficiency at around 480 nm increase from 78 to 84%. Hence, the fill factor and short-circuit current density are markedly improved from 0.35 ± 0.02 to 0.55 ± 0.05 and from 18 ± 1 to 18.8 ± 0.3 mA cm -2 , respectively. Finally, the best device is achieved with power conversion efficiencies of 12.2% by annealing at 130 °C for 10 min. The photoluminescence and photo-induced charge carrier extraction in linearly increasing voltages measurements indicate that the charge carrier mobility in C5PcH 2 increases, and thereby the hole extraction and transportation from the perovskite layer to the Au anode as well the photovoltaic performance of PCS is improved by using thermal annealing processing. [ABSTRACT FROM AUTHOR]