Conjugated Polyelectrolytes Bearing Various Ion Densities: Spontaneous Dipole Generation, Poling-Induced Dipole Alignment, and Interfacial Energy Barrier Control for Optoelectronic Device Applications

Seungjin Lee, Thanh Luan Nguyen, Sang Yun Lee, Chung Hyeon Jang, Bo Ram Lee, Eui Dae Jung, Song Yi Park, Yung Jin Yoon, Jin Young Kim, Han Young Woo, Myoung Hoon Song

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Conjugated polyelectrolytes (CPEs) with π-delocalized main backbones and ionic pendant groups are intensively studied as interfacial layers for efficient polymer-based optoelectronic devices (POEDs) because they facilitate facile control of charge injection/extraction barriers. Here, a simple and effective method of performing precise interfacial energy level adjustment is presented by employing CPEs with different thicknesses and various ion densities under electric poling to realize efficient charge injection/extraction of POEDs. The effects of the CPE ion densities and electric (positive or negative) poling on the energy level tuning process are investigated by measuring the open-circuit voltages and current densities of devices with the structure indium tin oxide/zinc oxide/CPE/organic active layer/molybdenum oxide/gold while changing the CPE film thickness. The performances of inverted polymer light-emitting diodes and inverted polymer solar cells are remarkably improved by precisely controlling the interfacial energy level matching using optimum CPE conditions.

Original languageEnglish
Article number1706034
JournalAdvanced Materials
Volume30
Issue number14
DOIs
Publication statusPublished - 2018 Apr 5

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Bearings (structural)
Energy barriers
Polyelectrolytes
Interfacial energy
Optoelectronic devices
Ions
Electron energy levels
Polymers
Charge injection
Zinc Oxide
Molybdenum oxide
Open circuit voltage
Zinc oxide
Tin oxides
Gold
Indium
Light emitting diodes
Film thickness
Current density
Tuning

Keywords

  • charge injection/extraction
  • conjugated polyelectrolytes (CPEs)
  • electric poling
  • ion density
  • polymer optoelectronic devices (POEDs)

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Conjugated Polyelectrolytes Bearing Various Ion Densities : Spontaneous Dipole Generation, Poling-Induced Dipole Alignment, and Interfacial Energy Barrier Control for Optoelectronic Device Applications. / Lee, Seungjin; Nguyen, Thanh Luan; Lee, Sang Yun; Jang, Chung Hyeon; Lee, Bo Ram; Jung, Eui Dae; Park, Song Yi; Yoon, Yung Jin; Kim, Jin Young; Woo, Han Young; Song, Myoung Hoon.

In: Advanced Materials, Vol. 30, No. 14, 1706034, 05.04.2018.

Research output: Contribution to journalArticle

Lee, Seungjin ; Nguyen, Thanh Luan ; Lee, Sang Yun ; Jang, Chung Hyeon ; Lee, Bo Ram ; Jung, Eui Dae ; Park, Song Yi ; Yoon, Yung Jin ; Kim, Jin Young ; Woo, Han Young ; Song, Myoung Hoon. / Conjugated Polyelectrolytes Bearing Various Ion Densities : Spontaneous Dipole Generation, Poling-Induced Dipole Alignment, and Interfacial Energy Barrier Control for Optoelectronic Device Applications. In: Advanced Materials. 2018 ; Vol. 30, No. 14.
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