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Two-Dimensional Hybrid Organohalide Perovskites from Ultrathin PbS Nanocrystals as Template

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Centre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
§ Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
Surface Physics and Material Science Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
Department of Physics & CSRRI, Illinois Institute of Technology, Chicago, Illinois 60616, United States
# Council of Scientific and Industrial Research-Network of Institutes for Solar Energy (CSIR-NISE), New Delhi 110001, India
*E-mail: [email protected] Tel: +91 33 2473 4971 (Ext. 1104).
Cite this: J. Phys. Chem. C 2017, 121, 11, 6401–6408
Publication Date (Web):February 28, 2017
https://doi.org/10.1021/acs.jpcc.7b01236
Copyright © 2017 American Chemical Society

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    Abstract

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    Direct conversion of preprocessed binary semiconductor NCs as template holds the key toward the shape control of hybrid perovskites. Here we report on an innovative route for realizing shape-controlled hybrid organohalide perovskite NCs from two-dimensional PbS NCs on solid substrates. Rectangular PbI2 NCs are first synthesized by iodination of PbS NCs. Resultant PbI2 NCs are subsequently transformed into the well-defined rectangular hybrid perovskite NCs upon controlled CH3NH3Br exposure. Structural analyses using X-ray absorption fine structure reveal transition of cubic lattice of PbS to hybrid perovskites with a mixture of cubic and tetragonal phases exhibiting a bimodal distribution of shorter Pb–Br and longer Pb–I bonds around an immediate neighboring lead absorber within the first coordination shell. This direct all anion exchange reaction route opens up new strategies for the fabrication of shape-controlled perovskite NCs on flexible substrates from suitable existing binary NCs as template for optoelectronic applications.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.7b01236.

    • Experimental methods, TEM, AFM, EDX, SAED, chemical mapping, XRD analyses, and XAFS analyses of the NCs (PDF)

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