Open Access System for Information Sharing

Login Library

 

Article
Cited 79 time in webofscience Cited 82 time in scopus
Metadata Downloads

Influence of intermolecular interactions of electron donating small molecules on their molecular packing and performance in organic electronic devices SCIE SCOPUS

Title
Influence of intermolecular interactions of electron donating small molecules on their molecular packing and performance in organic electronic devices
Authors
Ki-Hyun KimHojeong YuHyunbum KangDong Jin KangChul-Hee ChoHan-Hee ChoOh, JHBumjoon Kim
Date Issued
2013-09
Publisher
Royal Society of Chemistry
Abstract
5 Intermolecular interactions have a critical role in determining the molecular packing and orientation of conjugated polymers and organic molecules, leading to significant changes in their electrical and optical properties. Herein, we investigated the effects of intermolecular interactions of electron-donating small molecules on their structural, optical, and electrical properties, as well as on their performance in organic field-effect transistors (OFETs) and organic photovoltaics (OPVs). A series of dithienosilole-based small molecule donors were synthesized by introducing different terminal groups of ester and amide groups combined with three different versions of alkyl side chains. In comparison to dithienosilole-based small molecules with ester terminal groups, those with amide terminal groups exhibit strong intermolecular interaction by hydrogen bonding in a non-destructive manner. In addition, in order to control the intermolecular distance during assembly and thus fine-tune the interaction between the small molecule donors, three different alkyl side chains (i.e., n-octyl, n-decyl, and 2-ethylhexyl chains) were introduced into both small molecules with amide and ester terminal groups. The molecular packing and orientation of the small molecule donors were dramatically changed upon modifying the terminal groups and the alkyl side chains, as evidenced by grazing incidence X-ray scattering (GIXS) measurements. This feature significantly affected the electrical properties of the small molecules in OFETs. The trends in the activation energies for charge transport and the hole mobilities in OFETs were consistent with the molecular ordering and orientation propensity. In addition, the nano-scale morphology of small molecules blended with [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) was also influenced by the intermolecular interaction of small molecule donors. Power conversion efficiencies of more than 4.3% in OPVs were obtained from dithienosilole-based small molecules with ester terminal groups and linear side chains due to the optimized intermolecular interaction and morphology of the active layer.
URI
https://oasis.postech.ac.kr/handle/2014.oak/10978
DOI
10.1039/C3TA13266H
ISSN
2050-7488
Article Type
Article
Citation
JOURNAL OF MATERIALS CHEMISTRY, vol. 1, no. 46, page. 14538 - 14547, 2013-09
Files in This Item:

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher

오준학OH, JOON HAK
Dept. of Chemical Enginrg
Read more

Views & Downloads

Browse