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      Synthesis, structure, and photovoltaic property of a nanocrystalline 2H perovskite-type novel sensitizer (CH 3CH 2NH 3)PbI 3

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          Abstract

          A new nanocrystalline sensitizer with the chemical formula (CH 3CH 2NH 3)PbI 3 is synthesized by reacting ethylammonium iodide with lead iodide, and its crystal structure and photovoltaic property are investigated. X-ray diffraction analysis confirms orthorhombic crystal phase with a = 8.7419(2) Å, b = 8.14745(10) Å, and c = 30.3096(6) Å, which can be described as 2 H perovskite structure. Ultraviolet photoelectron spectroscopy and UV-visible spectroscopy determine the valence band position at 5.6 eV versus vacuum and the optical bandgap of ca. 2.2 eV. A spin coating of the CH 3CH 2NH 3I and PbI 2 mixed solution on a TiO 2 film yields ca. 1.8-nm-diameter (CH 3CH 2NH 3)PbI 3 dots on the TiO 2 surface. The (CH 3CH 2NH 3)PbI 3-sensitized solar cell with iodide-based redox electrolyte demonstrates the conversion efficiency of 2.4% under AM 1.5 G one sun (100 mW/cm 2) illumination.

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          Semiconductor Clusters, Nanocrystals, and Quantum Dots

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            Quantum dots for live cells, in vivo imaging, and diagnostics.

            Research on fluorescent semiconductor nanocrystals (also known as quantum dots or qdots) has evolved over the past two decades from electronic materials science to biological applications. We review current approaches to the synthesis, solubilization, and functionalization of qdots and their applications to cell and animal biology. Recent examples of their experimental use include the observation of diffusion of individual glycine receptors in living neurons and the identification of lymph nodes in live animals by near-infrared emission during surgery. The new generations of qdots have far-reaching potential for the study of intracellular processes at the single-molecule level, high-resolution cellular imaging, long-term in vivo observation of cell trafficking, tumor targeting, and diagnostics.
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              Optical Properties and Electronic Structure of Amorphous Germanium

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                Author and article information

                Journal
                Nanoscale Res Lett
                Nanoscale Res Lett
                Nanoscale Research Letters
                Springer
                1931-7573
                1556-276X
                2012
                28 June 2012
                : 7
                : 1
                : 353
                Affiliations
                [1 ]School of Chemical Engineering and Department of Energy Science, Sungkyunkwan University, Suwon, 440-746, Republic of Korea
                [2 ]Department of Chemistry, Division of Energy Systems Research, Ajou University, Suwon, 443-749, Republic of Korea
                Article
                1556-276X-7-353
                10.1186/1556-276X-7-353
                3442983
                22738298
                Copyright ©2012 Im et al.; Licensee Springer.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                Categories
                Nano Express

                Nanomaterials

                (ch3ch2nh3)pbi3, 2h perovskite, sensitizer, nanodot, dye-sensitized solar cell

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