Issue 30, 2019

Dielectric properties and the role of grain boundaries in polycrystalline tetracene at high pressures

Abstract

The dielectric properties and the role of grain boundaries in polycrystalline tetracene were studied at pressures of up to 21.3 GPa using in situ impedance spectroscopy measurements. Two anomalous changes in some of the electrical parameters (resistance, relaxation frequency and relative permittivity) were found at 6.0 and 19.0 GPa, which were related to the structural rearrangement and condensation reaction processes, respectively. Within this pressure range, grain boundaries play an important role in polycrystalline tetracene's conduction mechanism. Based on first-principles calculations, it was found that the variation in bulk resistance under pressure was mainly caused by a change of band gap. Intermolecular interactions are more sensitive to pressure than intramolecular interactions. The decrease in the relative permittivity under pressure indicates the existence of space charge polarization of the interface layer in addition to electronic polarization.

Graphical abstract: Dielectric properties and the role of grain boundaries in polycrystalline tetracene at high pressures

Article information

Article type
Paper
Submitted
20 jun 2019
Accepted
25 jun 2019
First published
26 jun 2019

CrystEngComm, 2019,21, 4507-4512

Dielectric properties and the role of grain boundaries in polycrystalline tetracene at high pressures

Q. Wang, D. Sang, S. Guo, X. Wang, W. Wang, B. Zhang, H. Hu, Q. Fan and C. Liu, CrystEngComm, 2019, 21, 4507 DOI: 10.1039/C9CE00961B

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