Preparation of anatase TiO2 thin film by low temperature annealing as an electron transport layer in inverted polymer solar cells

Title
Preparation of anatase TiO2 thin film by low temperature annealing as an electron transport layer in inverted polymer solar cells
Authors
오성근
Keywords
Inverted polymer solar cell; TiO2 film; Low temperature annealing; PCE; Solvothermal process
Issue Date
2015-04
Publisher
ELSEVIER SCIENCE BV
Citation
APPLIED SURFACE SCIENCE, v. 333, Page. 157-162
Abstract
To prepare the anatase TiO2 thin films on ITO glass, amorphous TiO2 colloidal solution was synthesized through the simple sol-gel method by using titanium (IV) isopropoxide as a precursor. This amorphous TiO2 colloidal solution was spread on ITO glass by spin-coating, then treated at 450 degrees C to obtain anatase TiO2 film (for device A). For other TiO2 films, amorphous TiO2 colloidal solution was treated through solvothermal process at 180 degrees C to obtain anatase TiO2 colloidal solution. This anatase TiO2 colloidal solution was spread on ITO glass by spin coating, and then annealed at 200 degrees C (for device B) and 130 degrees C (for device C), respectively. The average particle size of amorphous TiO2 colloidal solution was about 1.0 nm and that of anatase TiO2 colloidal solution was 10 nm. The thickness of TiO2 films was about 15 nm for all cases. When inverted polymer solar cells were fabricated by using these TiO2 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 TiO2 films. The result of this study can be applied for the preparation of inverted polymer solar cell using TiO2 films as a buffer layer at low temperature on plastic substrate by roll-to roll process. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0169433215003050http://hdl.handle.net/20.500.11754/24062
ISSN
0169-4332; 1873-5584
DOI
http://dx.doi.org/10.1016/j.apsusc.2015.02.010
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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