Anomalous Ambipolar Transport of Organic Semiconducting Crystals via Control of Molecular Packing Structures.

Citation data:

ACS applied materials & interfaces, ISSN: 1944-8252, Vol: 9, Issue: 33, Page: 27839-27846

Publication Year:
2017
Usage 1
Abstract Views 1
Social Media 1
Tweets 1
Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/22716
PMID:
28767219
DOI:
10.1021/acsami.7b05129
Author(s):
Park, Beomjin; Kim, Kyunghun; Park, Jaesung; Lim, Heeseon; Lanh, Phung Thi; Jang, A-Rang; Hyun, Chohee; Myung, Chang Woo; Park, Seungkyoo; Kim, Jeong Won; Kim, Kwang S; Shin, Hyeon Suk; Lee, Geunsik; Kim, Se Hyun; Park, Chan Eon; Kim, Jin Kon Show More Hide
Publisher(s):
American Chemical Society (ACS); AMER CHEMICAL SOC
Tags:
Materials Science; ambipolar charge transport; hexagonal boron nitride (h-BN); organic field-effect transistors; organic/h-BN heterostructures; van der Waals substrates
Most Recent Tweet View All Tweets
article description
Organic crystals deposited on 2-dimensional (2D) van der Waals substrates have been widely investigated due to their unprecedented crystal structures and electrical properties. van der Waals interaction between organic molecules and the substrate induces epitaxial growth of high quality organic crystals and their anomalous crystal morphologies. Here, we report on unique ambipolar charge transport of a "lying-down" pentacene crystal grown on a 2D hexagonal boron nitride van der Waals substrate. From in-depth analysis on crystal growth behavior and ultraviolet photoemission spectroscopy measurement, it is revealed that the pentacene crystal at the initial growth stage have a lattice-strained packing structure and unique energy band structure with a deep highest occupied molecular orbital level compared to conventional "standing-up" crystals. The lattice-strained pentacene few layers enable ambipolar charge transport in field-effect transistors with balanced hole and electron field-effect mobilities. Complementary logic circuits composed of the two identical transistors show clear inverting functionality with a high gain up to 15. The interesting crystal morphology of organic crystals on van der Waals substrates is expected to attract broad attentions on organic/2D interfaces for their electronic applications.