Indian Association for the Cultivation of Science

About: Indian Association for the Cultivation of Science is a education organization based out in Kolkata, India. It is known for research contribution in the topics: Catalysis & Excited state. The organization has 3867 authors who have published 10457 publications receiving 220098 citations.

High-Performance Flexible Perovskite Solar Cells on Ultrathin Glass: Implications of the TCO.

Abstract: For halide perovskite solar cells (PSCs) to fulfill their vast potential for combining low-cost, high efficiency, and high throughput production they must be scaled using a truly transformative method, such as roll-to-roll processing Bringing this reality closer to fruition, the present work demonstrates flexible perovskite solar cells with 181% power conversion efficiency on flexible Willow Glass substrates We highlight the importance of the transparent conductive oxide (TCO) layers on device performance by studying various TCOs While tin-doped indium oxide (ITO) and indium zinc oxide (IZO) based PSC devices demonstrate high photovoltaic performances, aluminum-doped zinc oxide (AZO) based devices underperformed in all device parameters Analysis of X-ray photoemission spectroscopy data shows that the stoichiometry of the perovskite film surface changes dramatically when it is fabricated on AZO, demonstrating the importance of the substrate in perovskite film formation

High temperature ferromagnetism in single crystalline dilute Fe-doped Ba Ti O 3

Abstract: We report the observation of room temperature ferromagnetism in high quality, single crystalline dilute Fe-doped $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}$. The large equilibrium solubility of Fe ions in the matrix refutes uncertainties about secondary phase magnetism, which has often eclipsed this interesting field of research. While room temperature ferromagnetism is observed at and above 5% Fe concentrations, one finds a highly concave temperature dependence of the susceptibility. Using detailed ab initio calculation, this has been related to intrinsic magnetic inhomogeneities arising from positional disorder. Apart from providing a mechanism for the observed high temperature ferromagnetism, our results point out that intrinsic disorder is a generic and essential component of dilute magnetism.

Au@ZnO Core−Shell Nanoparticles Are Efficient Energy Acceptors with Organic Dye Donors

Abstract: The present study highlights the efficient fluorescence resonance energy transfer from Rhodamine 6G dye to Au@ZnO core−shell nanoparticle by steady state and time-resolved spectroscopy. The calculated energy transfer efficiencies from dye to nanoparticles are 41.3, 52.6, and 72.6% for Au, mixture of Au and ZnO, and core−shell Au@ZnO nanoparticles, respectively. There is a pronounced effect on the PL quenching and a shortening of the lifetime of the dye in the presence of Au@ZnO core−shell nanoparticle which is associated with high charge storage capacity. The nonradiative decay rates are 2.80 × 108, 3.90 × 108 and 7.67 × 108 s−1 for pure Au, mixture of Au and ZnO and core- shell Au@ZnO nanoparticles, respectively, indicating the resonance energy transfer process. The calculated Forster distances (R0) are 135.0 and 144.4 A for Au, and core- shell Au@ZnO nanoparticles, respectively and corresponding the calculated distances (d) between the donor and acceptor are 143.05, and 123.5 A. Considering the interact...

One-pot synthesis of an acid-labile amphiphilic triblock copolymer and its pH-responsive vesicular assembly

Abstract: An amphiphilic triblock copolymer segmented by an acid-labile b-thiopropionate linker was synthesized from a dithiol, a diacrylate, and an acrylate-terminated hydrophilic polymer in two steps in one pot. It showed spontaneous vesicular assembly, and the stimuli-responsive disassembly at mild acidic pH values resulted in sustained release of noncovalently encapsulated guest molecules. Angewandte Chemie