Date
Place
- Room H (Room Hall 1, 1F)
- P2. Poster Session II
- August 21, 2015 (Friday)
- 14:00 ~ 15:30
- [P2-139]
- 14:00 ~ 15:30
- Title:An Ultrathin Iridium Oxide Hole Extraction Layer on P3HT: PCBM Bulk Hetero-Junction Organic Photovoltaic¡¯s Cells
- Rina Pandey, Ju Won Lim, Jung Hyuk Kim, Do Kyung Hwang, and Won Kook Choi (KIST, Korea)
Abstract: Transparent conducting oxides (TCO) are the integral part of the present day electro-optic devices as transparent conducting electrodes (TCE) in solar cells, displays and solid-state lighting [1-2]. Indium Tin Oxide (ITO), traditionally used as a transparent electrode material due to its high transmittance (> 90%) and good electrical conductivity (Rs < 15 W/sq) [3-4]. ? In this study, an ultrathin iridium oxide was deposited on glass/ITO substrate using radio frequency magnetron sputtering for the applications of organic photovoltaic¡¯s cells. Iridium oxide (IrOx), used as the hole extraction layer (HEL) in order to replace poly (3,4-ethylenedioxythiophene): poly(styrene-sulfonate) PEDOT:PSS in organic photovoltaic¡¯s (OPV) cells with poly(3-hexylthiophene):phenyl-C60-butyric acid methyl ester (P3HT: PC60BM). IrOx is a transparent conducting oxides, and the work function of the IrOx (> 5.1 eV) is higher than that of ITO (4.5 ~ 4.7 eV). Moreover, IrOx has a surface with hydrophobic nature. Thus, HEL of IrOx between ITO anodes and active layer improve the extraction of holes. IrOx (0.5 nm) coated on ITO glass substrate shows the transmittances of 84.10% in the visible range. The transmittance decreased when the thickness of the IrOx increased from 1.0 to 3.0 nm. The iridium oxide has a blue black color due to intraband transitions within the Ir t2g band. When the thickness of IrOx becomes thick, the absorption could increase because of the increase of intraband transition. The OPV cell with IrOx (1.0 nm) exhibits increased power conversion efficiency as 3.51% under 100 mW/cm2 illumination with an air mass (AM 1.5G) condition, higher than that of 3.28% with PEDOT: PSS. Chemically stable IrOx enabling easy device fabrication could therefore be used as an alternative material for PEDOT: PSS and is applicable to general anode HELs on organic electronics.
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