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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

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Published on: March 27, 2019

Aggregation-Dependent Dielectric Permittivity in 2D Molecular Crystals.

Yutian Yang¹, Yingying Wang², Jingsi Qiao³

¹School of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing, 211189, P. R. China.

|February 17, 2022

Summary

The dielectric permittivity of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) molecular crystals changes with layer stacking. Molecular orientation on WS2 substrates dictates permittivity, enabling device tuning.

Keywords:

2D aggregation anisotropy dielectric permittivity organic molecular crystals

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Area of Science:

Materials Science
Condensed Matter Physics
Organic Electronics

Background:

The performance of 2D molecular crystal devices relies on intrinsic properties like energy levels and dielectric permittivity.
Molecular aggregation significantly influences these properties, impacting device functionality.

Purpose of the Study:

To investigate and demonstrate the tunability of dielectric permittivity in C8-BTBT molecular crystals grown on WS2 substrates.
To understand the relationship between molecular orientation, aggregation, and dielectric properties.

Main Methods:

Growth of C8-BTBT molecular crystals on monolayer WS2 substrates.
Polarized optical contrast spectroscopy to measure dielectric permittivity.
Analysis of molecular orientations (lying-down vs. standing-up) and Coulomb coupling (J_Coup).

Main Results:

Dielectric permittivity of C8-BTBT was tuned from 4.62 (wetting layer) to 2.25 (second layer).
Observed permittivity anisotropy related to molecular orientation and substrate interaction.
Identified H-aggregation (positive J_Coup) in the wetting layer and J-aggregation (negative J_Coup) in subsequent layers.

Conclusions:

Molecular orientation is the key factor controlling dielectric permittivity in C8-BTBT on WS2.
The findings provide a pathway for manipulating dielectric properties of 2D molecular crystals.
This research can advance the development of novel electronic and optoelectronic devices.