Enriched Photophysical Properties and Thermal Stability of Tin(II) Substituted Lead-Based Perovskite Nanocrystals with Mixed Organic-Inorganic Cations

Selvarajan, P and Kundu, K and Sathish, CI and Umapathy, S and Vinu, A (2020) Enriched Photophysical Properties and Thermal Stability of Tin(II) Substituted Lead-Based Perovskite Nanocrystals with Mixed Organic-Inorganic Cations. In: Journal of Physical Chemistry C, 124 (17). pp. 9611-9621.

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Abstract

In order to overcome the toxicity and long-term stability of hybrid organic/inorganic Pb-based halide perovskites, which are believed to be the key obstacles for their utilization in optoelectronic devices, herein we explored the synthesis of binary Pb-Sn perovskite nanocrystals (NCs) with fixed composition of methylammonium (MA) and cesium (Cs) cations. Mixed MA-Cs composition has been used to achieve an improvement in thermal stability and photophysical property of binary Pb-Sn systems. However, challenges lie in how to accomplish much better or identical optical properties and thermal stability of complex mixed cationic Sn-substituted systems when compared to pristine Pb-based perovskites by maintaining the divalent state of Sn under ambient condition. With the intention of circumventing the oxidation of Sn2+, we synthesized for the first time a series of perovskite NCs, MA0.5Cs0.5Pb1-xSnxBr3 (i.e., 0 ≤ x ≥ 0.5) using room-temperature ligand-assisted reprecipitation (LARP) method without maintaining inert atmosphere. A substantial advancement toward higher relative photoluminescence (PL) quantum yield, prolonged charge carrier lifetime, and enhanced environmental and thermal stabilities was achieved at a fixed composition through alloying with Sn (i.e., MA0.5Cs0.5Pb1-xSnxBr3 NCs, at x = 0.3). Interestingly, Raman spectroscopic analysis along with powder X-ray diffraction patterns and microscopic images suggest that the Sn substitution did not affect the crystal structure and the chemical interplay between the organic cation and inorganic framework of pristine MA0.5Cs0.5PbBr3 NCs. Such understandings are constructive en route for improving the properties of Sn-substituted Pb-based perovskite NCs with reduced toxicity for their execution in forthcoming optoelectronic technologies. Copyright © 2020 American Chemical Society.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	Copy right for this article belongs to American Chemical Society
Keywords:	Binary alloys; Carrier lifetime; Crystal structure; Lead compounds; Nanocrystals; Optical properties; Optoelectronic devices; Perovskite; Positive ions; Raman spectroscopy; Spectroscopic analysis; System stability; Thermodynamic stability; Toxicity, Ambient conditions; Halide perovskites; Inert atmospheres; Long term stability; Optoelectronic technology; Organic/inorganic; Photophysical properties; Powder X ray diffraction, Tin compounds
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	23 Sep 2020 09:39
Last Modified:	23 Sep 2020 09:39
URI:	http://eprints.iisc.ac.in/id/eprint/65606

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