The photoelectrochemical properties and stability of dye sensitized solar cells containing Mn(beta-diketonato)(3) complexes, [Mn-III(acac)(3)] (1) (acac = acetylacetonate), [Mn-III(CF2)(3)] (2) (CF2 = 4,4-difluoro-1-phenylbutanate-1,3-dione), (Mn-III(DBM)(3)] (3) (DBM = dibenzoylmethanate), [Mn-II(CF2)(3)]TBA (TBA = tetrabutylammonium) (4) and [Mn-II(DBM)(3)]TBA (5), have been evaluated. At room temperature, the complexes undergo ligand exchange with 4-tert-butyl-pyridine, an additive commonly used in the solar device to reduce charge recombination at the photoanode. An increased device stability was achieved by using the Z907 dye and passivating the photoanode with short chain siloxanes. It was also found that the Mn(II)/(III) couple is involved in the dye regeneration process, instead of Mn(III)/(IV) (E-1/2 > 1 V vs. SCE) previously indicated in the literature.
On the stability of manganese tris(beta-diketonate) complexes as redox mediators in DSSCs
Argazzi Roberto;
2016
Abstract
The photoelectrochemical properties and stability of dye sensitized solar cells containing Mn(beta-diketonato)(3) complexes, [Mn-III(acac)(3)] (1) (acac = acetylacetonate), [Mn-III(CF2)(3)] (2) (CF2 = 4,4-difluoro-1-phenylbutanate-1,3-dione), (Mn-III(DBM)(3)] (3) (DBM = dibenzoylmethanate), [Mn-II(CF2)(3)]TBA (TBA = tetrabutylammonium) (4) and [Mn-II(DBM)(3)]TBA (5), have been evaluated. At room temperature, the complexes undergo ligand exchange with 4-tert-butyl-pyridine, an additive commonly used in the solar device to reduce charge recombination at the photoanode. An increased device stability was achieved by using the Z907 dye and passivating the photoanode with short chain siloxanes. It was also found that the Mn(II)/(III) couple is involved in the dye regeneration process, instead of Mn(III)/(IV) (E-1/2 > 1 V vs. SCE) previously indicated in the literature.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.