Preparation of anatase TiO 2 thin film by low temperature annealing as an electron transport layer in inverted polymer solar cells

Hongche Noh, Seong-Geun Oh, Seung Soon Im

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

To prepare the anatase TiO 2 thin films on ITO glass, amorphous TiO 2 colloidal solution was synthesized through the simple sol-gel method by using titanium (IV) isopropoxide as a precursor. This amorphous TiO 2 colloidal solution was spread on ITO glass by spin-coating, then treated at 450 °C to obtain anatase TiO 2 film (for device A). For other TiO 2 films, amorphous TiO 2 colloidal solution was treated through solvothermal process at 180 °C to obtain anatase TiO 2 colloidal solution. This anatase TiO 2 colloidal solution was spread on ITO glass by spin coating, and then annealed at 200 °C (for device B) and 130 °C (for device C), respectively. The average particle size of amorphous TiO 2 colloidal solution was about 1.0 nm and that of anatase TiO 2 colloidal solution was 10 nm. The thickness of TiO 2 films was about 15 nm for all cases. When inverted polymer solar cells were fabricated by using these TiO 2 films as an electron transport layer, the device C showed the highest PCE (2.6%) due to the lack of defect, uniformness and high light absorbance of TiO 2 films. The result of this study can be applied for the preparation of inverted polymer solar cell using TiO 2 films as a buffer layer at low temperature on plastic substrate by roll-to roll process.

Original languageEnglish
Pages (from-to)157-162
Number of pages6
JournalApplied Surface Science
Volume333
DOIs
StatePublished - 2015 Apr 1

Keywords

  • Inverted polymer solar cell
  • Low temperature annealing
  • PCE
  • Solvothermal process
  • TiO film

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