Interfacial electronic structure for high performance organic devices

Hyunbok Lee, Sangwan Cho, Yeonjin Yi

Research output: Contribution to journalReview article

14 Citations (Scopus)

Abstract

Organic semiconductors (OSCs) are at the center of attention in a wide range of research fields since their unique advantages meet the requirements for next-generation optoelectronics applications. Since OSCs are lacking intrinsic carriers, charges for device operation have to be injected through organic/electrode and organic/organic interfaces. Therefore, the charge injection efficiency, which is determined by the energy level alignments at those interfaces, governs the device performance. In other words, high performance organic devices cannot be achieved without facilitating proper energy level alignments. Thus, the interfacial electronic structure, which should be determined from accurate measurements of the charge transport level, must be understood to establish the design strategy for high performance organic devices. In this review, various spectroscopic methods to investigate the surface and interface electronic structures, including direct photoelectron spectroscopy, inverse photoelectron spectroscopy, X-ray absorption spectroscopy and X-ray emission spectroscopy, are discussed along with their fundamental principles. Examples of device performance enhancements with modification of the interfacial electronic structure in organic photovoltaics and organic light-emitting diodes are presented.

Original languageEnglish
Pages (from-to)1533-1549
Number of pages17
JournalCurrent Applied Physics
Volume16
Issue number12
DOIs
Publication statusPublished - 2016 Dec 1

Fingerprint

Electronic structure
Semiconducting organic compounds
Photoelectron spectroscopy
electronic structure
Electron energy levels
organic semiconductors
Charge injection
X ray absorption spectroscopy
Organic light emitting diodes (OLED)
Charge carriers
Optoelectronic devices
energy levels
alignment
Charge transfer
photoelectron spectroscopy
Electrodes
charge carriers
absorption spectroscopy
x rays
light emitting diodes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

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Interfacial electronic structure for high performance organic devices. / Lee, Hyunbok; Cho, Sangwan; Yi, Yeonjin.

In: Current Applied Physics, Vol. 16, No. 12, 01.12.2016, p. 1533-1549.

Research output: Contribution to journalReview article

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AU - Yi, Yeonjin

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AB - Organic semiconductors (OSCs) are at the center of attention in a wide range of research fields since their unique advantages meet the requirements for next-generation optoelectronics applications. Since OSCs are lacking intrinsic carriers, charges for device operation have to be injected through organic/electrode and organic/organic interfaces. Therefore, the charge injection efficiency, which is determined by the energy level alignments at those interfaces, governs the device performance. In other words, high performance organic devices cannot be achieved without facilitating proper energy level alignments. Thus, the interfacial electronic structure, which should be determined from accurate measurements of the charge transport level, must be understood to establish the design strategy for high performance organic devices. In this review, various spectroscopic methods to investigate the surface and interface electronic structures, including direct photoelectron spectroscopy, inverse photoelectron spectroscopy, X-ray absorption spectroscopy and X-ray emission spectroscopy, are discussed along with their fundamental principles. Examples of device performance enhancements with modification of the interfacial electronic structure in organic photovoltaics and organic light-emitting diodes are presented.

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