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dc.contributor.authorHsieh, C.P.en_US
dc.contributor.authorLu, H.P.en_US
dc.contributor.authorChiu, C.L.en_US
dc.contributor.authorLee, C.W.en_US
dc.contributor.authorChuang, S.H.en_US
dc.contributor.authorMai, C.L.en_US
dc.contributor.authorYen, W.N.en_US
dc.contributor.authorHsu, S.J.en_US
dc.contributor.authorDiau, E.W.G.en_US
dc.contributor.authorYeh, C.Y.en_US
dc.description.abstractA series of porphyrin dyes with an electron-donating group (EDG) attached at a meso-position (YD1-YD8) have been designed and synthesized for use as sensitizers in dye-sensitized solar cells (DSSC). The nature of the EDG exerts a significant influence on the spectral, electrochemical and photovoltaic properties of these sensitizers. Absorption spectra of porphyrins having an amino group show broadened Soret band and red-shifted Q bands with respect to those of reference porphyrin YD0. This phenomenon is more pronounced for porphyrins YD7 and YD8 that have a pi-conjugated triphenylamine at the meso-position opposite the anchoring group. Upon introduction of an EDG at the meso-position, the potential for the first oxidation alters significantly to the negative whereas that for the first reduction changes inappreciably, indicating a decreased HOMO-LUMO gap. Results of density-functional theory (DFT) calculations support the spectroelectrochemical data for a delocalization of charge between the porphyrin ring and the amino group in the first oxidative state of diarylamino-substituted porphyrins YD1-YD4, which exhibit superior photovoltaic performance among all porphyrins under investigation. With long-chain alkyl groups on the diarylamino substituent, YD2 shows the best cell performance with J(SC) = 13.4 mA cm(-2), V(OC) = 0.71 V, and FF = 0.69, giving an overall efficiency 6.6% of power conversion under simulated one-sun AM1.5 illumination.en_US
dc.relationJournal of Materials Chemistryen_US
dc.relation.ispartofseriesJournal of Materials Chemistry, Volume 20, Issue 6, Page(s) 1127-1134.en_US
dc.subjectnanocrystalline tio2 filmsen_US
dc.subjectconjugated organic-dyesen_US
dc.subjectenergy conversionen_US
dc.subjectopen-circuit voltageen_US
dc.subjectphotovoltaic propertiesen_US
dc.subjectadsorbing groupsen_US
dc.subjectcoumarin dyeen_US
dc.titleSynthesis and characterization of porphyrin sensitizers with various electron-donating substituents for highly efficient dye-sensitized solar cellsen_US
dc.typeJournal Articlezh_TW
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