Orientation control of linear-shaped molecules in vacuum-deposited organic amorphous films and its effect on carrier mobilities

Daisuke Yokohama, Yousuke Setoguchi, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi

Research output: Contribution to journalArticle

97 Citations (Scopus)

Abstract

The molecular orientation of linear-shaped molecules in organic amorphous films is demonstrated to be controllable by the substrate temperature. It is also shown that the molecular orientation affects the charge-transport characteristics of the films. Although linear-shaped 4,4′-bis[(N- carbazole)styryl]biphenyl molecules deposited on substrates at room temperature are horizontally oriented in amorphous films, their orientation when deposited on heated substrates with smooth surfaces becomes more random as the substrate temperature increases, even at temperatures under the glass transition temperature. Another factor dominating the orientation of the molecules deposited on heated substrates is the surface roughness of the substrate. Lower carrier mobilities are observed in films composed of randomly oriented molecules, demonstrating the significant effect of a horizontal molecular orientation on the charge-transport characteristics of organic amorphous films.

Original languageEnglish
Pages (from-to)386-391
Number of pages6
JournalAdvanced Functional Materials
Volume20
Issue number3
DOIs
Publication statusPublished - Feb 8 2010

Fingerprint

Carrier mobility
Amorphous films
carrier mobility
Vacuum
vacuum
Molecules
Molecular orientation
Substrates
molecules
Charge transfer
Temperature
carbazoles
glass transition temperature
temperature
surface roughness
Surface roughness
room temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Orientation control of linear-shaped molecules in vacuum-deposited organic amorphous films and its effect on carrier mobilities. / Yokohama, Daisuke; Setoguchi, Yousuke; Sakaguchi, Akio; Suzuki, Michio; Adachi, Chihaya.

In: Advanced Functional Materials, Vol. 20, No. 3, 08.02.2010, p. 386-391.

Research output: Contribution to journalArticle

Yokohama, Daisuke ; Setoguchi, Yousuke ; Sakaguchi, Akio ; Suzuki, Michio ; Adachi, Chihaya. / Orientation control of linear-shaped molecules in vacuum-deposited organic amorphous films and its effect on carrier mobilities. In: Advanced Functional Materials. 2010 ; Vol. 20, No. 3. pp. 386-391.
@article{997f9de5d9a3462fa2cda2257312acbd,
title = "Orientation control of linear-shaped molecules in vacuum-deposited organic amorphous films and its effect on carrier mobilities",
abstract = "The molecular orientation of linear-shaped molecules in organic amorphous films is demonstrated to be controllable by the substrate temperature. It is also shown that the molecular orientation affects the charge-transport characteristics of the films. Although linear-shaped 4,4′-bis[(N- carbazole)styryl]biphenyl molecules deposited on substrates at room temperature are horizontally oriented in amorphous films, their orientation when deposited on heated substrates with smooth surfaces becomes more random as the substrate temperature increases, even at temperatures under the glass transition temperature. Another factor dominating the orientation of the molecules deposited on heated substrates is the surface roughness of the substrate. Lower carrier mobilities are observed in films composed of randomly oriented molecules, demonstrating the significant effect of a horizontal molecular orientation on the charge-transport characteristics of organic amorphous films.",
author = "Daisuke Yokohama and Yousuke Setoguchi and Akio Sakaguchi and Michio Suzuki and Chihaya Adachi",
year = "2010",
month = "2",
day = "8",
doi = "10.1002/adfm.200901684",
language = "English",
volume = "20",
pages = "386--391",
journal = "Advanced Functional Materials",
issn = "1616-301X",
publisher = "Wiley-VCH Verlag",
number = "3",

}

TY - JOUR

T1 - Orientation control of linear-shaped molecules in vacuum-deposited organic amorphous films and its effect on carrier mobilities

AU - Yokohama, Daisuke

AU - Setoguchi, Yousuke

AU - Sakaguchi, Akio

AU - Suzuki, Michio

AU - Adachi, Chihaya

PY - 2010/2/8

Y1 - 2010/2/8

N2 - The molecular orientation of linear-shaped molecules in organic amorphous films is demonstrated to be controllable by the substrate temperature. It is also shown that the molecular orientation affects the charge-transport characteristics of the films. Although linear-shaped 4,4′-bis[(N- carbazole)styryl]biphenyl molecules deposited on substrates at room temperature are horizontally oriented in amorphous films, their orientation when deposited on heated substrates with smooth surfaces becomes more random as the substrate temperature increases, even at temperatures under the glass transition temperature. Another factor dominating the orientation of the molecules deposited on heated substrates is the surface roughness of the substrate. Lower carrier mobilities are observed in films composed of randomly oriented molecules, demonstrating the significant effect of a horizontal molecular orientation on the charge-transport characteristics of organic amorphous films.

AB - The molecular orientation of linear-shaped molecules in organic amorphous films is demonstrated to be controllable by the substrate temperature. It is also shown that the molecular orientation affects the charge-transport characteristics of the films. Although linear-shaped 4,4′-bis[(N- carbazole)styryl]biphenyl molecules deposited on substrates at room temperature are horizontally oriented in amorphous films, their orientation when deposited on heated substrates with smooth surfaces becomes more random as the substrate temperature increases, even at temperatures under the glass transition temperature. Another factor dominating the orientation of the molecules deposited on heated substrates is the surface roughness of the substrate. Lower carrier mobilities are observed in films composed of randomly oriented molecules, demonstrating the significant effect of a horizontal molecular orientation on the charge-transport characteristics of organic amorphous films.

UR - http://www.scopus.com/inward/record.url?scp=76149105165&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=76149105165&partnerID=8YFLogxK

U2 - 10.1002/adfm.200901684

DO - 10.1002/adfm.200901684

M3 - Article

VL - 20

SP - 386

EP - 391

JO - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

IS - 3

ER -