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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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
Publication:	JOURNAL OF PHYSICAL CHEMISTRY C
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
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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