A strategy to design highly efficient porphyrin sensitizers for dye-sensitized solar cells

Chang, Yu‐Cheng; Wang, Chin‐Li; Pan, Tsung‐Yu; Hong, Shang-Hao; Lan, Chi-Ming; Kuo, Hshin-Hui; Lo, Chen-Fu; Hsu, Heng-Tung; Lin, Che; Diau, Eric Wei‐Guang

doi:10.1039/c1cc12764k

Cited by 256 publications

(187 citation statements)

References 23 publications

Supporting

Mentioning

183

Contrasting

Order By: Relevance

“…The values of V OC of YD2-oC8 and YD30 were significantly greater than of V OC of YD2 because of the effect of the long alkoxyl chains attached at the ortho positions of the meso-phenyls. 5,17 The overall photovoltaic performances of the thin-film samples are consistent with those of the optimized devices; 5 the observed E-PL results measured for TiO 2 films of thickness ∼3 μm are utilized to rationalize the photovoltaic performances of porphyrin dyes in this series.…”

Section: Resultsmentioning

confidence: 87%

“…These orthosubstituted devices outperformed their para-and metasubstituted counterparts because a substitution of the long alkoxyl groups at the ortho-position protects the porphyrin cores from dye aggregation and from forming a blocking layer on the TiO 2 surface. 5,17,18 Electroabsorption (E-A) and electrophotoluminescence (E-PL) spectra, i.e., plots of the change of an absorption spectrum and photoluminescence spectrum, respectively, induced with an electric field have been extensively used to examine electronic properties, such as electric-dipole moment and molecular polarizability, for organic and polymeric thin-film systems. 19−23 Several authors reported the effects of local electric fields on the optical properties of DSSC.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Field-Induced Fluorescence Quenching and Enhancement of Porphyrin Sensitizers on TiO₂ Films and in PMMA Films

Hsu

Chiang

et al. 2013

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

Three highly efficient porphyrin sensitizersYD2, YD2-oC8, and YD30, either sensitized on TiO 2 films or embedded in PMMA filmswere investigated using electrophotoluminescence (E-PL) spectra. Under both thin-film conditions, on application of an external electric field we observed the quenching of fluorescence of push−pull porphyrins (YD2 and YD2-oC8) and a slightly enhanced fluorescence of the reference porphyrin without an electron donor group (YD30). A nonfluorescent state with charge separation (CS) is proposed to be involved in both YD2 and YD2-oC8 systems so that the electron injection becomes accelerated in the presence of a strong electric field. In contrast, the retardation of the nonradiative process not involving a CS state was the reason for the field-induced enhancement of fluorescence of YD30. The extent of fluorescence quenching of YD2-oC8 was greater than that of YD2 on TiO 2 films, indicating that the ortho-substituted long alkoxyl chains play a key role to accelerate the consecutive electron injection involving the CS state. Our E-PL results indicate that a field-induced variation of fluorescent intensity is related to the efficiency of conversion of solar energy and that further improvement of the performance of devices containing push−pull porphyrin dyes is achievable under an applied electric field.

show abstract

Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Field-Induced Fluorescence Quenching and Enhancement of Porphyrin Sensitizers on TiO₂ Films and in PMMA Films

Hsu

Chiang

et al. 2013

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

show abstract

“…[56][57][58][59] In our case, OD9 was co-sensitized with the new porphyrin dye LW24 (Scheme2). As an analogue of the porphyrin dye LD14, [60,61] the LW24 dye is functionalized with an electron-withdrawing BTD unit to extend the conjugation length in the p bridge for the same purpose of OD9. The BTD unit is inserted between the porphyrin core and the benzoic acid.…”

Section: à2mentioning

confidence: 99%

Molecular Engineering of Organic Dyes with a Hole‐Extending Donor Tail for Efficient All‐Solid‐State Dye‐Sensitized Solar Cells

Chang

Cheng

et al. 2015

ChemSusChem

Self Cite

View full text Add to dashboard Cite

We report a new concept for the design of metal-free organic dyes (OD5-OD9) with an extended donor-π-acceptor (D-π-A) molecular framework, in which the donor terminal unit is attached by a hole-extending side chain to retard back electron transfer and charge recombination; the π-bridge component contains varied thiophene-based substituents to enhance the light-harvesting ability of the device. The best dye (OD9) has a D-A-π-A configuration with the hexyloxyphenylthiophene (HPT) side chain as a hole-extension component and a benzothiadiazole (BTD) internal acceptor as a π-extension component. The co-sensitization of OD9 with the new porphyrin dye LW24 enhanced the light-harvesting ability to 800 nm; thus, a power conversion efficiency 5.5 % was achieved. Photoinduced absorption (PIA) and transient absorption spectral (TAS) techniques were applied to account for the observed trend of the open-circuit voltage (VOC ) of the devices. This work provides insights into the molecular design, photovoltaic performance, and kinetics of charge recombination.

show abstract

“…Recently, alternative dyes to ruthenium complexes have been reported in the literature. These dyes contain large π-π aromatic molecules such as metalloporphyrins (MPs), and they constitute an important class of sensitizers on TiO 2 [20][21][22][23][24][25][26]. The central metal in the dye is zinc.…”

Section: Introductionmentioning

confidence: 99%

Interaction of YD2 and TiO2 in dye-sensitized solar cells (DSSCs): a density functional theory study

et al. 2015

View full text Add to dashboard Cite

The interaction of the dye YD2 with a cluster of (anatase-phase) TiO2 (which is utilized in dye-sensitized solar cells, DSSCs) and electron injection by the dye into the cluster were studied by performing density functional theory (DFT) calculations at the B3LYP, PBE, and TPSS levels of theory, including dispersion effects. We studied and quantified the interaction of the metallomacrocycle with the TiO2 cluster and the electronic spectrum of the complex. TDDFT calculations using the B3LYP functional were found to be the most suitable for describing the observed absorption energy bands of YD2 and YD2-TiO2. Our calculations show that the diarylamino groups act as electron donors in the photon-induced injection that occurs in DSSCs. The free-energy changes that take place during electron injection support the good performance of YD2 on TiO2 clusters.

show abstract

A strategy to design highly efficient porphyrin sensitizers for dye-sensitized solar cells

Cited by 256 publications

References 23 publications

Field-Induced Fluorescence Quenching and Enhancement of Porphyrin Sensitizers on TiO₂ Films and in PMMA Films

Field-Induced Fluorescence Quenching and Enhancement of Porphyrin Sensitizers on TiO₂ Films and in PMMA Films

Molecular Engineering of Organic Dyes with a Hole‐Extending Donor Tail for Efficient All‐Solid‐State Dye‐Sensitized Solar Cells

Interaction of YD2 and TiO2 in dye-sensitized solar cells (DSSCs): a density functional theory study

Contact Info

Product

Resources

About

A strategy to design highly efficient porphyrin sensitizers for dye-sensitized solar cells

Cited by 256 publications

References 23 publications

Field-Induced Fluorescence Quenching and Enhancement of Porphyrin Sensitizers on TiO2 Films and in PMMA Films

Field-Induced Fluorescence Quenching and Enhancement of Porphyrin Sensitizers on TiO2 Films and in PMMA Films

Molecular Engineering of Organic Dyes with a Hole‐Extending Donor Tail for Efficient All‐Solid‐State Dye‐Sensitized Solar Cells

Interaction of YD2 and TiO2 in dye-sensitized solar cells (DSSCs): a density functional theory study

Contact Info

Product

Resources

About

Field-Induced Fluorescence Quenching and Enhancement of Porphyrin Sensitizers on TiO₂ Films and in PMMA Films

Field-Induced Fluorescence Quenching and Enhancement of Porphyrin Sensitizers on TiO₂ Films and in PMMA Films