Few nm of Ag layer embedded in fluorine doped zinc tin oxide FZTO/Ag/FZTO was fabricated on glass by radio frequency magnetron sputtering at room temperature for the applications of organic photovoltaic's cells. The structural, electrical and optical properties of FZTO thin films were investigated. The multilayer of the FZTO (40 nm)/Ag (9 nm)/FZTO (40 nm) electrode shows the maximum optical transmittance (λ=380-770 nm) of 88.15%, quite low electrical resistivity of ∼8×10-5 Ω cm and the corresponding figure of merit (T10/Rsq) is equivalent to 3.46×10-2 Ω-1. A normal organic photovoltaic's (OPV) structure of poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b]dithiophene-2,6-diyl][3-fluoro-2-[(2 ethylhexyl)carbonyl]thieno[3,4-b]-thiophenediyl] (PTB7): phenyl-C70-butyric acid methyl ester (PC70BM) was fabricated on glass/FZTO/Ag/FZTO to examine the compatibility of OPV as a transparent conducting electrode. The bulk hetero-junction organic photovoltaic's device fabricated on the multilayer FAF electrode exhibited open circuit voltage (Voc) of 0.72 V, a short circuit current (Jsc) of 12.28 mA/cm2, a fill factor (FF) of 0.54. These properties are analogous to Voc=0.75 V, Jsc=14.87 mA/cm2, FF=0.53 on commercial indium tin oxide (ITO). A resultant power conversion efficiency of 4.84% is comparable with the 5.90% of the same OPV structure on the commercial ITO as a reference. This reveals that FZTO/Ag/FZTO multilayer electrode is a promising electrode scheme for bulk hetero-junction organic photovoltaic's cells (BHJ-OPVs).
Bibliographical noteFunding Information:
This work was partially supported by the Converging Research Centre Program through the Ministry of Science , ICT and Future Planning, Korea ( 2013K000199 ), Industrial Core Technology Development Program ( 2MR2010 ) from Ministry of Trade, Industry, and Energy (MOTIE) , and also by the ATC program ( 10048659 ) from Ministry of Trade, Industry, and Energy (MOTIE), Republic of Korea .
© 2014 Elsevier B.V. All rights reserved.
- Bulk hetero-junction Organic Photovoltaic's
- Cells (BHJ-OPVs)
- Electrical and optical properties
- F doped ZTO (FZTO)
- Multilayer transparent conducting electrode
- Power conversion efficiency