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

Pradhan, Jayita and Mukherjee, Soham and Khan, Ali Hossain and Dalui, Amit and Satpati, Biswarup and Segre, Carlo U and Sarma, D D and Acharya, Somobrata (2017) Two-Dimensional Hybrid Organohalide Perovskites from Ultrathin PbS Nanocrystals as Template. In: JOURNAL OF PHYSICAL CHEMISTRY C, 121 (11). pp. 6401-6408.

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Official URL: http://dx.doi.org/10.1021/acs.jpcc.7b01236

Abstract

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 organo-halide 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 application

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 26 Apr 2017 07:24
Last Modified: 26 Apr 2017 07:24
URI: http://eprints.iisc.ac.in/id/eprint/56646

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