TY - JOUR
T1 - 2000 hours photostability testing of dye sensitised solar cells using a cobalt bipyridine electrolyte
AU - Jiang, Roger
AU - Anderson, Assaf
AU - Barnes, Piers R.F.
AU - Xiaoe, Li
AU - Law, Chunhung
AU - O'Regan, Brian C.
PY - 2014/4/7
Y1 - 2014/4/7
N2 - DSSCs incorporating Co(ii/iii) tris(bipyridine) redox couple in acetonitrile and the Z907 dye were subjected to ≥2000 hours of light soaking at 20 °C and ∼1 sun light intensity from white LEDs (∼no UV component). Initial energy efficiencies were near 6.3%. After 2000 hours, the best acetonitrile based cells maintained ∼66% of the initial efficiency. Both JSC and fill factor (FF) declined, while the VOC remained highly stable. In comparison, the best Z907/cobalt cells with 3-methoxypropionitrile (MPN) as a solvent, maintained 91% of the initial efficiency after 2000 hour light soaking. Only FF declined in MPN based cells. In follow up testing of similar ACN cells at the maximum power point, at 30 °C, the best cells maintained ∼100% of the initial efficiency after 1000 hours. Impedance, JSCvs. intensity and charge extraction data are consistent with a decrease in the Co(iii) concentration, or a restriction in Co(iii) diffusion, during light soaking.
AB - DSSCs incorporating Co(ii/iii) tris(bipyridine) redox couple in acetonitrile and the Z907 dye were subjected to ≥2000 hours of light soaking at 20 °C and ∼1 sun light intensity from white LEDs (∼no UV component). Initial energy efficiencies were near 6.3%. After 2000 hours, the best acetonitrile based cells maintained ∼66% of the initial efficiency. Both JSC and fill factor (FF) declined, while the VOC remained highly stable. In comparison, the best Z907/cobalt cells with 3-methoxypropionitrile (MPN) as a solvent, maintained 91% of the initial efficiency after 2000 hour light soaking. Only FF declined in MPN based cells. In follow up testing of similar ACN cells at the maximum power point, at 30 °C, the best cells maintained ∼100% of the initial efficiency after 1000 hours. Impedance, JSCvs. intensity and charge extraction data are consistent with a decrease in the Co(iii) concentration, or a restriction in Co(iii) diffusion, during light soaking.
UR - http://www.scopus.com/inward/record.url?scp=84897713268&partnerID=8YFLogxK
U2 - 10.1039/c4ta00402g
DO - 10.1039/c4ta00402g
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AN - SCOPUS:84897713268
SN - 2050-7488
VL - 2
SP - 4751
EP - 4757
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 13
ER -
