Novel cyanine dyes with different methine chains as sensitizers for nanocrystalline solar cell

Xiu-Ying, Chen; Guo, Jiahao; Peng, Xiaojun; Guo, Min; Xu, Yongqian; Shi, Lei; Liang, C.-T.; Wang, L i; Gao, Yanfang; Sun, Shiguo; Cai, Shengmin

doi:10.1016/j.jphotochem.2004.10.016

Cited by 56 publications

(14 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…30 Similarly, Armitage and colleagues reported a stoichiometry of 2.5 base pairs per dye in 3,3′-diethylthiadicarbocyanine aggregates formed in the minor grooves of poly(dAdT). 40 [4]arene with a molar stoichiometry of 3:1 (TO:calix [4]arene). This involves three TO molecules in the aggregate and four sulfonate groups in the calix [4]arene.…”

Section: Resultsmentioning

confidence: 99%

Formation of Stable BOBO-3 H-Aggregate Complexes Hinders DNA Hybridization

2010

View full text Add to dashboard Cite

In recent works, we have been studying the photophysics and binding properties of the trimethine cyanine homodimer dye BOBO-3, a DNA intercalative fluorophore that shows an important fluorescence enhancement upon binding to double-stranded DNA. During the course of studying the interactions of the dye with single-stranded homo-oligonucleotides we detected the apparition of an additional absorption band centered on 466 nm. The large hypsochromic effect and the fact that direct excitation of this band resulted in negligible fluorescence emission are characteristic properties of an H-type molecular aggregate. In this work we study the properties of this H-aggregate, and obtain by means of Principal Component Analysis the spectral shape and association constant of the complex. The H-aggregate complex shows very unique features. On one hand, the nucleotide bases cytosine or adenine are crucially involved in the formation of the aggregate. We describe here that at least six consecutive cytidine nucleosides are required to properly form the BOBO-3 H-aggregate complex. On the other hand, we demonstrate that the formation of such a stable complex prevents hybridization of the bases involved with their complementary strands. This phenomenon draws important conclusions on the anomalously high stability of the BOBO-3 H-aggregate complex. To the best of our knowledge, this is the first time such a stable H-aggregate of a dimeric cyanine dye facilitated by specific nucleotide bases in single strands has been reported.

show abstract

Section: Resultsmentioning

confidence: 99%

Formation of Stable BOBO-3 H-Aggregate Complexes Hinders DNA Hybridization

2010

View full text Add to dashboard Cite

show abstract

“…However, the rare resource of metal Ru and other environmental problems will limit the further development of Ru-based DSSCs for commercialization. Therefore, in order to improve the PCE and to overcome the drawback of Ru-complex sensitizers, the organic dye sensitizers, including cyanines [ 14 – 16 ], hemicyanines [ 17 , 18 ], triarylamins [ 8 , 19 , 20 ], perylenes [ 21 – 25 ], coumarins [ 26 – 28 ], porphyrins [ 29 – 34 ], squaraines [ 35 – 37 ], indoline [ 38 , 39 ], and azulene-based dyes [ 40 ], etc. were developed because of their high molar absorption coefficient, relatively simple synthetic procedure, easily modified structures and lower cost.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Electronic Structures and Absorption Properties of Porphyrin Sensitizers YD2 and YD2-o-C8 for Dye-Sensitized Solar Cells

Han

Zhang

Zhe

et al. 2013

IJMS

View full text Add to dashboard Cite

The electronic structures and excitation properties of dye sensitizers determine the photon-to-current conversion efficiency of dye sensitized solar cells (DSSCs). In order to understand the different performance of porphyrin dye sensitizers YD2 and YD2-o-C8 in DSSC, their geometries and electronic structures have been studied using density functional theory (DFT), and the electronic absorption properties have been investigated via time-dependent DFT (TDDFT) with polarizable continuum model for solvent effects. The geometrical parameters indicate that YD2 and YD2-o-C8 have similar conjugate length and charge transfer (CT) distance. According to the experimental spectra, the HSE06 functional in TDDFT is the most suitable functional for describing the Q and B absorption bands of porphyrins. The transition configurations and molecular orbital analysis suggest that the diarylamino groups are major chromophores for effective CT excitations (ECTE), and therefore act as electron donor in photon-induced electron injection in DSSCs. The analysis of excited states properties and the free energy changes for electron injection support that the better performance of YD2-o-C8 in DSSCs result from the more excited states with ECTE character and the larger absolute value of free energy change for electron injection.

show abstract

“…In metal-free organic dyes sensitizers, such as cyanines [12–14], hemicyanines [15,16], triphenylmethanes [8,17,18], perylenes [19–23], coumarins [24–26], porphyrins [27–32], squaraines [33–35], indoline [36,37], and azulene-based dyes [38] etc. , were developed since their high molar absorption coefficient, relatively simple synthetic procedure, various structures, and lower cost.…”

Section: Introductionmentioning

confidence: 99%

The Role of the Conjugate Bridge in Electronic Structures and Related Properties of Tetrahydroquinoline for Dye Sensitized Solar Cells

Zhang

Liu

Zhe

et al. 2013

IJMS

View full text Add to dashboard Cite

To understand the role of the conjugate bridge in modifying the properties of organic dye sensitizers in solar cells, the computations of the geometries and electronic structures for 10 kinds of tetrahydroquinoline dyes were performed using density functional theory (DFT), and the electronic absorption and fluorescence properties were investigated via time dependent DFT. The population analysis, molecular orbital energies, radiative lifetimes, exciton binding energies (EBE), and light harvesting efficiencies (LHE), as well as the free energy changes of electron injection (ΔGinject ) and dye regeneration ( ΔGdyeregen ) were also addressed. The correlation of charge populations and experimental open-circuit voltage (Voc) indicates that more charges populated in acceptor groups correspond to larger Voc. The elongating of conjugate bridge by thiophene units generates the larger oscillator strength, higher LHE, larger absolute value of ΔGinject, and longer relative radiative lifetime, but it induces the decreasing of EBE and ΔGdyeregen. So the extending of conjugate bridge with thiopene units in organic dye is an effective way to increase the harvest of solar light, and it is also favorable for electron injection due to their larger ΔGinject. While the inversely correlated relationship between EBE and LHE implies that the dyes with lower EBE produce more efficient light harvesting.

show abstract

Novel cyanine dyes with different methine chains as sensitizers for nanocrystalline solar cell

Cited by 56 publications

References 13 publications

Formation of Stable BOBO-3 H-Aggregate Complexes Hinders DNA Hybridization

Formation of Stable BOBO-3 H-Aggregate Complexes Hinders DNA Hybridization

Understanding the Electronic Structures and Absorption Properties of Porphyrin Sensitizers YD2 and YD2-o-C8 for Dye-Sensitized Solar Cells

The Role of the Conjugate Bridge in Electronic Structures and Related Properties of Tetrahydroquinoline for Dye Sensitized Solar Cells

Contact Info

Product

Resources

About