Development of Novel Conjugated Polyelectrolytes as Water-Processable Interlayer Materials for High-Performance Organic Photodiodes

Seongwon Yoon, Jea Woong Jo, Seong Hoon Yu, Jae Hoon Yun, Hae Jung Son, Dae Sung Chung

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A series of novel conjugated polyelectrolytes composed of two different building blocks with different composition ratios were designed and synthesized for application as a functional layer in high-performance organic photodiodes (OPDs). A homopolymer and two random copolymers were prepared using different molar ratios of dibromo 1,4-bis(4-sulfonatobutoxy)benzene (SPh) and dibromo 1,4-bis(4-tetraethylene glycol)benzene (EGPh): EG20 with SPh:EGPh ratio of 0.8:0.2 and EG40 with a ratio of 0.6:0.4. Structural analyses by two-dimensional grazing-incidence X-ray diffraction and near-edge X-ray absorption fine structure spectroscopy studies proved that a higher EGPh content could induce more organized polymer chains with face-on orientation of EG20 and EG40. Such an orientation of EG20 and EG40 along with the ordered crystalline organization yielded effective molecular dipole moments in the thin films when applied as an interlayer between ZnO and an active layer of inverted OPDs. As confirmed by ultraviolet photoelectron spectroscopy, the increase in EG content gradually shifted the workfunction of the ZnO, facilitating the inverted OPD to simultaneously achieve a decrease in dark current and enhancement in photocurrent. The synergetic effects introduced by the newly designed EG20 and EG40 resulted in significantly improved OPD performances with high specific detectivity up to 2.1 × 1013 Jones, 3 dB bandwidth of 72 kHz, and linear dynamic range of 110 dB.

Original languageEnglish
Pages (from-to)703-709
Number of pages7
JournalACS Photonics
Volume4
Issue number3
DOIs
StatePublished - 15 Mar 2017

Keywords

  • conjugated polyelectrolytes
  • high detectivity
  • low dark current
  • organic photodiode
  • water-soluble
  • work function

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