Phase Diagram and Dielectric Properties of MA(1-x)FA(x)PbI(3)

Mohanty, Ashutosh and Swain, Diptikanta and Govinda, Sharada and Row, Tayur N Guru and Sarma, D D (2019) Phase Diagram and Dielectric Properties of MA(1-x)FA(x)PbI(3). In: ACS ENERGY LETTERS, 4 (9). pp. 2045-2051.

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Abstract

With the help of 10 different compositions (x) between 0.0 and 0.4 for MA(1-x)FA(x)PbI(3) and about 20 temperature points between 15 and 310 K for each composition, we establish a rich temperature composition phase diagram in terms of structural variations determined by powder and single-crystal X-ray diffraction. Four crystallographic phases are found to exist for this solid solution series, namely, cubic (Pm-3m), tetragonal (I4/mcm), orthorhombic (Pnma), and large-cell cubic (Im-3). Variable-temperature dielectric measurement reveals qualitative changes in dielectric properties of these materials driven by the observed structural phase transitions; it establishes that with an increasing FA content the high-temperature-dominant Curie-like behavior in dielectric constant of MAPbI(3) gets suppressed and an unusually prominent glassy behavior evolves in direct correlation with the structural evolution. This reveals a strong structure-property correlation existing in these solid solutions, qualitatively modifying properties of MAPbI(3) with FA substitution.

Item Type:	Journal Article
Publication:	ACS ENERGY LETTERS
Publisher:	AMER CHEMICAL SOC
Additional Information:	copyright for this article belongs to AMER CHEMICAL SOC
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	29 Oct 2019 09:57
Last Modified:	29 Oct 2019 09:57
URI:	http://eprints.iisc.ac.in/id/eprint/63727

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