Molecularly Controlled Stark Effect Induces Significant Rectification in Polycyclic-Aromatic-Hydrocarbon-Terminated n-Alkanethiolates

Soo Jin Cho, Gyu Don Kong, Sohyun Park, Jeongwoo Park, Seo Eun Byeon, Taekyeong Kim, Hyo Jae Yoon

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The variation of the electronic structure of individual molecules as a function of the applied bias matters for the performance of molecular and organic electronic devices. Understanding the structure-electric-field relationship, however, remains a challenge because of the lack of in-operando spectroscopic technique and complexity arising from the ill-defined on-surface structure of molecules and organic-electrode interfaces within devices. We report that a reliable and reproducible molecular diode can be achieved by control of the conjugation length in polycyclic-aromatic-hydrocarbon (PAH)-terminated n-alkanethiolate (denoted as SC11PAH), incorporated into liquid-metal-based large-area tunnel junctions in the form of a self-assembled monolayer. By taking advantage of the structural simplicity and tunability of SC11PAH and the high-yielding feature of the junction technique, we demonstrate that the increase in the conjugation length of the PAH terminal group leads to a significant rectification ratio up to ∼1.7 × 102 at ±740 mV. Further study suggests that the Stark shift of the molecular energy resonance of the PAH breaks the symmetry of the energy topography across the junction and induces rectification in a temperature-independent charge-transport regime.

Original languageEnglish
Pages (from-to)545-553
Number of pages9
JournalNano Letters
Volume19
Issue number1
DOIs
Publication statusPublished - 2019 Jan 9

Fingerprint

Stark effect
Polycyclic Aromatic Hydrocarbons
polycyclic aromatic hydrocarbons
rectification
Polycyclic aromatic hydrocarbons
conjugation
Molecules
Tunnel junctions
molecular electronics
Self assembled monolayers
liquid metals
Liquid metals
tunnel junctions
Surface structure
Topography
Electronic structure
Charge transfer
molecules
topography
Diodes

Keywords

  • EGaIn
  • large area tunnel junction
  • molecular diode
  • polycyclic aromatic hydrocarbon
  • rectification
  • self-assembled monolayer
  • Stark effect

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Molecularly Controlled Stark Effect Induces Significant Rectification in Polycyclic-Aromatic-Hydrocarbon-Terminated n-Alkanethiolates. / Cho, Soo Jin; Kong, Gyu Don; Park, Sohyun; Park, Jeongwoo; Byeon, Seo Eun; Kim, Taekyeong; Yoon, Hyo Jae.

In: Nano Letters, Vol. 19, No. 1, 09.01.2019, p. 545-553.

Research output: Contribution to journalArticle

Cho, Soo Jin ; Kong, Gyu Don ; Park, Sohyun ; Park, Jeongwoo ; Byeon, Seo Eun ; Kim, Taekyeong ; Yoon, Hyo Jae. / Molecularly Controlled Stark Effect Induces Significant Rectification in Polycyclic-Aromatic-Hydrocarbon-Terminated n-Alkanethiolates. In: Nano Letters. 2019 ; Vol. 19, No. 1. pp. 545-553.
@article{998a53eb563b4fb7a42cdbd58144e9af,
title = "Molecularly Controlled Stark Effect Induces Significant Rectification in Polycyclic-Aromatic-Hydrocarbon-Terminated n-Alkanethiolates",
abstract = "The variation of the electronic structure of individual molecules as a function of the applied bias matters for the performance of molecular and organic electronic devices. Understanding the structure-electric-field relationship, however, remains a challenge because of the lack of in-operando spectroscopic technique and complexity arising from the ill-defined on-surface structure of molecules and organic-electrode interfaces within devices. We report that a reliable and reproducible molecular diode can be achieved by control of the conjugation length in polycyclic-aromatic-hydrocarbon (PAH)-terminated n-alkanethiolate (denoted as SC11PAH), incorporated into liquid-metal-based large-area tunnel junctions in the form of a self-assembled monolayer. By taking advantage of the structural simplicity and tunability of SC11PAH and the high-yielding feature of the junction technique, we demonstrate that the increase in the conjugation length of the PAH terminal group leads to a significant rectification ratio up to ∼1.7 × 102 at ±740 mV. Further study suggests that the Stark shift of the molecular energy resonance of the PAH breaks the symmetry of the energy topography across the junction and induces rectification in a temperature-independent charge-transport regime.",
keywords = "EGaIn, large area tunnel junction, molecular diode, polycyclic aromatic hydrocarbon, rectification, self-assembled monolayer, Stark effect",
author = "Cho, {Soo Jin} and Kong, {Gyu Don} and Sohyun Park and Jeongwoo Park and Byeon, {Seo Eun} and Taekyeong Kim and Yoon, {Hyo Jae}",
year = "2019",
month = "1",
day = "9",
doi = "10.1021/acs.nanolett.8b04488",
language = "English",
volume = "19",
pages = "545--553",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "1",

}

TY - JOUR

T1 - Molecularly Controlled Stark Effect Induces Significant Rectification in Polycyclic-Aromatic-Hydrocarbon-Terminated n-Alkanethiolates

AU - Cho, Soo Jin

AU - Kong, Gyu Don

AU - Park, Sohyun

AU - Park, Jeongwoo

AU - Byeon, Seo Eun

AU - Kim, Taekyeong

AU - Yoon, Hyo Jae

PY - 2019/1/9

Y1 - 2019/1/9

N2 - The variation of the electronic structure of individual molecules as a function of the applied bias matters for the performance of molecular and organic electronic devices. Understanding the structure-electric-field relationship, however, remains a challenge because of the lack of in-operando spectroscopic technique and complexity arising from the ill-defined on-surface structure of molecules and organic-electrode interfaces within devices. We report that a reliable and reproducible molecular diode can be achieved by control of the conjugation length in polycyclic-aromatic-hydrocarbon (PAH)-terminated n-alkanethiolate (denoted as SC11PAH), incorporated into liquid-metal-based large-area tunnel junctions in the form of a self-assembled monolayer. By taking advantage of the structural simplicity and tunability of SC11PAH and the high-yielding feature of the junction technique, we demonstrate that the increase in the conjugation length of the PAH terminal group leads to a significant rectification ratio up to ∼1.7 × 102 at ±740 mV. Further study suggests that the Stark shift of the molecular energy resonance of the PAH breaks the symmetry of the energy topography across the junction and induces rectification in a temperature-independent charge-transport regime.

AB - The variation of the electronic structure of individual molecules as a function of the applied bias matters for the performance of molecular and organic electronic devices. Understanding the structure-electric-field relationship, however, remains a challenge because of the lack of in-operando spectroscopic technique and complexity arising from the ill-defined on-surface structure of molecules and organic-electrode interfaces within devices. We report that a reliable and reproducible molecular diode can be achieved by control of the conjugation length in polycyclic-aromatic-hydrocarbon (PAH)-terminated n-alkanethiolate (denoted as SC11PAH), incorporated into liquid-metal-based large-area tunnel junctions in the form of a self-assembled monolayer. By taking advantage of the structural simplicity and tunability of SC11PAH and the high-yielding feature of the junction technique, we demonstrate that the increase in the conjugation length of the PAH terminal group leads to a significant rectification ratio up to ∼1.7 × 102 at ±740 mV. Further study suggests that the Stark shift of the molecular energy resonance of the PAH breaks the symmetry of the energy topography across the junction and induces rectification in a temperature-independent charge-transport regime.

KW - EGaIn

KW - large area tunnel junction

KW - molecular diode

KW - polycyclic aromatic hydrocarbon

KW - rectification

KW - self-assembled monolayer

KW - Stark effect

UR - http://www.scopus.com/inward/record.url?scp=85059830827&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85059830827&partnerID=8YFLogxK

U2 - 10.1021/acs.nanolett.8b04488

DO - 10.1021/acs.nanolett.8b04488

M3 - Article

C2 - 30582703

AN - SCOPUS:85059830827

VL - 19

SP - 545

EP - 553

JO - Nano Letters

JF - Nano Letters

SN - 1530-6984

IS - 1

ER -