Structure and Morphology-Dependent Electrical Characteristics of Conjugated Organic Crystals Acquired by Various Growth Methods

Swathi, SK and Ranjith, K and Khanum, KK and Ramamurthy, PC (2021) Structure and Morphology-Dependent Electrical Characteristics of Conjugated Organic Crystals Acquired by Various Growth Methods. In: Journal of Electronic Materials .

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Abstract

Here, the effect of the organic conjugated small molecule crystal growth process on the evolution of the crystal morphology and consequent charge transport properties are studied. Evaluations are carried out on a donor-acceptor-donor structured organic small molecule, 7,9-di(thiophen-2-yl)-8Hcyclopentaaacenaphthylen-8-one) (DTCPA), which crystallizes in a monoclinic structure. Recrystallization of the DTCPA molecule is carried out by employing four growth methods via solvent evaporation through both concentrated and dilute solutions using a polar solvent, N-methyl-2-pyrrolidone. The four growth methods are slow evaporation of solvent from a dilute solution (SED) and a concentrated solution, quenching the hot concentrated solution, and slow cooling of hot concentrated solution. The morphological and optical studies demonstrated recrystallized particle size varying from 0.01 mm to 10 mm. The structural analysis revealed crystallite size from 30 nm to 160 nm. Current-voltage characterization and conductivity measurements indicate that these structural and morphological variations are critical factors in influencing and determining the electronic charge transport properties. The SED method results in relatively larger crystallites size and percent crystallinity, which leads to higher conductivity. Overall, by utilizing various growth methods for DTCPA, change in particle size, crystallite size, percent crystallinity, and optical absorption is assessed, which in turn affects the electrical properties. © 2021, The Minerals, Metals & Materials Society.

Item Type:	Journal Article
Publication:	Journal of Electronic Materials
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer
Keywords:	Carrier transport; Concentration (process); Crystal structure; Crystallinity; Crystallite size; Evaporation; Light absorption; Molecules; Morphology; Particle size; Recrystallization (metallurgy); Solvents; Transport properties, Conductivity measurements; Conjugated small molecules; Current-voltage characterization; Electrical characteristic; Morphological variation; N-methyl-2-pyrrolidone; Organic small molecule; Structure and morphology, Particle size analysis
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	21 Nov 2021 16:27
Last Modified:	21 Nov 2021 16:27
URI:	http://eprints.iisc.ac.in/id/eprint/69929

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