TY - JOUR
T1 - Transparent anodes for polymer photovoltaics
T2 - Oxygen permeability of PEDOT
AU - Andersen, Morten
AU - Carlé, Jon E.
AU - Cruys-Bagger, Nicolaj
AU - Lilliedal, Mathilde R.
AU - Hammond, Mark A.
AU - Winther Jensen, Bjorn
AU - Krebs, Frederik C.
PY - 2007/3/23
Y1 - 2007/3/23
N2 - The oxygen permeability of the transparent organic anode poly(3,4,-ethylene dioxythiophene) with paratoluenesulphonate as the anion (PEDOT:pTS) was determined to be 2.5 ± 0.7 × 10- 15 cm3 (STP) cm cm- 2 s- 1 Pa- 1, and is thus comparable in magnitude to the oxygen permeability of polyethyleneterephthalate (PET). The oxygen diffusion through bilayers of polyethylene (PE) and PEDOT:pTS and bilayers of PET and PEDOT:pTS was established. The bilayer structures were applied as the carrier substrate and the transparent anode in polymer-based photovoltaic devices employing a mixture of poly(1-methoxy-4-(2-ethylhexyloxy)-p-phenylenevinylene) (MEH-PPV) and [6,6]-phenyl-C61-butanoicacidmethylester (PCBM) as the active layer and aluminium as the cathode. The oxygen permeability of the layers and the aluminium cathode was correlated with the lifetime of the solar cell devices. It was found that the performance of the devices with PET as the carrier substrate degraded more slowly due to the lower oxygen and water permeability, whereas devices using PE as the carrier substrate gave devices with a very short lifetime. It was found that PEDOT:pTS on its own is a not a significant barrier for oxygen in the context of photovoltaic devices where long lifetimes are anticipated. It is concluded that the large oxygen permeability of the barrier layers contribute to the short device lifetimes while other permeates such as water also contribute to device degradation.
AB - The oxygen permeability of the transparent organic anode poly(3,4,-ethylene dioxythiophene) with paratoluenesulphonate as the anion (PEDOT:pTS) was determined to be 2.5 ± 0.7 × 10- 15 cm3 (STP) cm cm- 2 s- 1 Pa- 1, and is thus comparable in magnitude to the oxygen permeability of polyethyleneterephthalate (PET). The oxygen diffusion through bilayers of polyethylene (PE) and PEDOT:pTS and bilayers of PET and PEDOT:pTS was established. The bilayer structures were applied as the carrier substrate and the transparent anode in polymer-based photovoltaic devices employing a mixture of poly(1-methoxy-4-(2-ethylhexyloxy)-p-phenylenevinylene) (MEH-PPV) and [6,6]-phenyl-C61-butanoicacidmethylester (PCBM) as the active layer and aluminium as the cathode. The oxygen permeability of the layers and the aluminium cathode was correlated with the lifetime of the solar cell devices. It was found that the performance of the devices with PET as the carrier substrate degraded more slowly due to the lower oxygen and water permeability, whereas devices using PE as the carrier substrate gave devices with a very short lifetime. It was found that PEDOT:pTS on its own is a not a significant barrier for oxygen in the context of photovoltaic devices where long lifetimes are anticipated. It is concluded that the large oxygen permeability of the barrier layers contribute to the short device lifetimes while other permeates such as water also contribute to device degradation.
KW - Lifetime decay profiles
KW - Lifetimes
KW - Oxygen diffusion in PEDOT
KW - Polymer photovoltaics
KW - Stability
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U2 - 10.1016/j.solmat.2006.11.006
DO - 10.1016/j.solmat.2006.11.006
M3 - Article
AN - SCOPUS:33847309222
VL - 91
SP - 539
EP - 543
JO - Solar Cells
JF - Solar Cells
SN - 0927-0248
IS - 6
ER -