Performance enhancement in organic photovoltaic solar cells using iridium (Ir) ultra-thin surface modifier (USM)
- Performance enhancement in organic photovoltaic solar cells using iridium (Ir) ultra-thin surface modifier (USM)
- 최지원; 최원국; 김정혁; Rina Pandey; Ju Won Lim; Basavaraj Angadi
- ultra surface modifier; transparent conducting oxide; Iridium; OPV
- Issue Date
- Applied surface science
- VOL 444-104
- In this study, Iridium (Ir) metallic layer as an ultra-thin surface modifier (USM) was deposited on ITO coated glass substrate using radio frequency magnetron sputtering for improving the photo-conversion efficiency of organic photovoltaic cells. Ultra-thin Ir acts as a surface modifier replacing the conventional hole transport layer (HTL) PEDOT:PSS in organic photovoltaic (OPV) cells with two different active layers P3HT:PC60BM and PTB7:PC70BM. The Ir USM (1.0  nm) coated on ITO glass substrate showed transmittance of 84.1% and work function of >5.0  eV, which is higher than that of ITO (4.5– 4.7  eV). The OPV cells with Ir USM (1.0  nm) exhibits increased power conversion efficiency of 3.70% (for P3HT:PC60BM active layer) and 7.28% (for PTB7:PC70BM active layer) under 100  mW/cm2 illumination (AM 1.5G) which are higher than those of 3.26% and 6.95% for the same OPV cells but with PEDOT:PSS as HTL instead of Ir USM. The results reveal that the chemically stable Ir USM layer could be used as an alternative material for PEDOT:PSS in organic photovoltaic cells.
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