Charge transport studies of polymeric photovoltaic thin films with an electron blocking and trapping layer

Harrison K.H. Lee, Kevin K.H. Chan, Shu Kong SO*

*Corresponding author for this work

Research output: Chapter in book/report/conference proceedingConference proceedingpeer-review

1 Citation (Scopus)

Abstract

The transport properties of two photovoltaic polymers, poly(3- hexylthiophene) (P3HT) and poly(2,7-carbazole) derivative (PCDTBT), and their polymer:fullerene bulk heterojunction (BHJ) are studied by space-charge-limited current (SCLC), dark-injection space-charge-limited current (DI-SCLC), and admittance spectroscopy(AS). For a nominally hole-only device, electrons leakage occurs. This results in a current larger than the theoretical SCLC and ill-defined DI-SCLC and AS signals. In order to prevent electron leakage, a hole-transporting but electron blocking/trapping thin layer is added between active layer and Au. The layer composed of copper phthalocyanine (CuPc) doped into an amine-based small molecule. Using this interlayer, well-defined carrier transit time can be obtained for mobility extraction. With a suitable interlayer to suppress undesirable carrier injection and transport, these techniques should find broad applications in the transport characterization of narrow gap photovoltaic polymers and BHJ blends.

Original languageEnglish
Title of host publicationOrganic Photonics V
DOIs
Publication statusPublished - 2012
EventOrganic Photonics V - Brussels, Belgium
Duration: 16 Apr 201218 Apr 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8435
ISSN (Print)0277-786X

Conference

ConferenceOrganic Photonics V
Country/TerritoryBelgium
CityBrussels
Period16/04/1218/04/12

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

User-Defined Keywords

  • Admittance spectroscopy
  • Carrier mobility
  • Dark-injection space-charge-limited current
  • Electron blocking
  • Electron trapping
  • Energetic disorder
  • P3HT
  • PCDTBT

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