Towards high efficiency solution processable inverted bulk heterojunction polymer solar cells using modified indium tin oxide cathode

Xiaohong Chen, Jiaxiang Yang, Lim Yi Xuan Candy Haley, Jiong Lu, Fu Rong ZHU, Kian Ping Loh

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

High efficiency inverted regioregular poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM)-based polymer solar cells (PSCs) using an indium tin oxide (ITO) cathode, modified with a solution-processed ionic liquid-functionalized carbon nanoparticles (ILCNs) layer, was demonstrated. ILCNs-modified ITO cathode has a very good thermal stability and a superior surface electronic property suited for application in polymer solar cells. A power conversion efficiency (PCE) of 3.2% was obtained for inverted PSCs measured under AM1.5G illumination of 100 mW/cm2, which is comparable to PCE of a reference P3HT:PCBM-based solar cell having a conventional structure. There was almost no deterioration in the performance of inverted PSCs that were aged over a post-annealing temperature range from 100 to 200 °C. The work function of ILCNs-modified ITO cathode annealed at different temperatures was also measured using ultraviolet photoelectron spectroscopy. It was found that the work function of 4.4 eV, measured for a bare ITO electrode, decreased to 3.8 eV when it was modified with ILCNs, and was not dependent on the post-annealing temperature.

Original languageEnglish
Pages (from-to)1942-1946
Number of pages5
JournalOrganic Electronics
Volume11
Issue number12
DOIs
Publication statusPublished - Dec 2010

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

User-Defined Keywords

  • Carbon nanoparticles
  • Inverted bulk heterojunction polymer solar cells
  • ITO cathode

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