Improved photoinduced charge carriers separation in organic-inorganic hybrid photovoltaic devices

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Yana Vaynzof - , University of Cambridge (Author)
  • Dinesh Kabra - , University of Cambridge (Author)
  • Lihong Zhao - , National University of Singapore (Author)
  • Peter K.H. Ho - , National University of Singapore (Author)
  • Andrew T.S. Wee - , National University of Singapore (Author)
  • Richard H. Friend - , University of Cambridge, National University of Singapore (Author)

Abstract

We demonstrate enhanced performance of a hybrid photovoltaic device, where poly[3-hexylthiophene] (P3HT) is used as active material and a solution-processed thin flat film of ZnO modified by a self-assembled monolayer (SAM) of phenyl-C61-butyric acid (PCBA) is used as electron extracting electrode. Ultraviolet photoemission spectroscopy measurements reveal an increase in the substrate work function from 3.6 to 4.1 eV upon PCBA SAM deposition due to an interfacial dipole pointing away from the ZnO. External quantum efficiency (EQE) of the SAM modified devices reached 9%, greatly improved over the 3% EQE of the unmodified devices. This corresponds to full charge separation of all photoexcitations generated in the P3HT within an exciton diffusion range from the interface.

Details

Original languageEnglish
Article number033309
JournalApplied physics letters
Volume97
Issue number3
Publication statusPublished - 19 Jul 2010
Peer-reviewedYes
Externally publishedYes

Keywords

Sustainable Development Goals

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