Performance enhancement in organic photovoltaic solar cells using iridium (Ir) ultra-thin surface modifier (USM)

Title
Performance enhancement in organic photovoltaic solar cells using iridium (Ir) ultra-thin surface modifier (USM)
Authors
최지원최원국김정혁Rina PandeyJu Won LimBasavaraj Angadi
Keywords
ultra surface modifier; transparent conducting oxide; Iridium; OPV
Issue Date
2018-06
Publisher
Applied surface science
Citation
VOL 444-104
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/67452
ISSN
0169-4332
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KIST Publication > Article
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