High efficiency and stable dye-sensitized solar cells with an organic chromophore featuring a binary π-conjugated spacer

Zhang, Guangliang; Bala, Hari; Cheng, Yueming; Shi, Dong; Lv, Xueju; Yu, Qingjiang; Wang, Peng

doi:10.1039/b822325d

Cited by 575 publications

(353 citation statements)

References 27 publications

Supporting

Mentioning

337

Contrasting

Unclassified

Order By: Relevance

“…For the TPA organic dyes, experimental and theoretical investigations have demonstrated two allowed excited states characterized by large transition probabilities appearing in the UV/Vis region. [21,32] Our simulated results of the acene-modified TPA dyes show the experimental phenomenon, with a first intense peak in the 400-700 nm region and a second peak around 300 nm.…”

Section: Uv/visible and Fluorescence Spectrum Propertiessupporting

confidence: 68%

“…In addition, such orbital photoexcitation features also slow down the recombination of injected electrons in TiO 2 with oxidized dye molecules due to their remoteness. [21] V OC , the energy difference between the redox potential of the electrolyte and the quasi-Fermi level of the electron in the TiO 2 conduction band, is a key parameter for the h of DSSCs. The semiconductor conduction band shift (with respect to the electrolyte redox potential, Dc) can be expressed as a function of the dipole moment of adsorbed dye [Eq.…”

Section: Tpa Dyes On Tio 2 Surfacesmentioning

confidence: 99%

“…[20] It has been reported that suitable structural modifications of the bridging groups can greatly improve the DSSCs' performance. [21,22] A bathochromic shift and broadening of the absorption range as well as enhanced absorptivities will improve the photovoltaic performance. [6] Construction of large p conjugation is an important and effective method to broaden the absorption spectra of dyes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acene‐Modified Triphenylamine Dyes for Dye‐Sensitized Solar Cells: A Computational Study

2012

View full text Add to dashboard Cite

A series of metal‐free acene‐modified triphenylamine dyes (benzene to pentacene, denoted as TPA‐AC1 to TPA‐AC5) are investigated as organic sensitizers for application in dye‐sensitized solar cells (DSSCs). A combination of density functional theory (DFT), density functional tight‐binding (DFTB), and time‐dependent DFT (TDDFT) approaches is employed. The effects of acene units on the spectra and electrochemical properties of the acene‐modified TPA organic dyes are demonstrated. The dye/(TiO2)46 anatase nanoparticle systems are also simulated to show the electronic structures at the interface. The results show that from TPA‐AC1 to TPA‐AC5 with increasing sizes of the acenes, the absorption and fluorescence spectra are systematically broadened and red‐shifted, but the oscillator strength and electron injection properties are reduced. The molecular orbital contributions show increasing localization on the bridging acene units from TPA‐AC1 to TPA‐AC5. From the theoretical examination of some key parameters including free enthalpy related to the electron injection, light‐harvesting efficiency, and the shift of semiconductor conduction band, TPA‐AC3 with an anthracene moiety demonstrates a balance of the above crucial factors. TPA‐AC3 is expected to be a promising dye with desirable energetic and spectroscopic parameters in the DSSC field, which is consistent with recent experimental work. This study is expected to deepen our understanding of TPA‐based organic dyes and assist the molecular design of new metal‐free dyes for the further optimization of DSSCs.

show abstract

Section: Uv/visible and Fluorescence Spectrum Propertiessupporting

confidence: 68%

Section: Tpa Dyes On Tio 2 Surfacesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acene‐Modified Triphenylamine Dyes for Dye‐Sensitized Solar Cells: A Computational Study

2012

View full text Add to dashboard Cite

show abstract

“…Por otro lado, los colorantes orgánicos no sólo resultan más económicos, también alcanzan una eficiencia alrededor de 9.8%. 7 Sin embargo, la desventaja de los colorantes orgánicos son los problemas asociados con la complejidad de las rutas sintéticas.…”

Section: Introductionunclassified

Celdas solares sensibilizadas con colorantes fotosensibles obtenidos de plantas de la región sur de Ecuador

Cabrera¹,

Figueroa²,

Ramirez-Perez³

et al. 2016

Quim. Nova

View full text Add to dashboard Cite

SENSITIZED SOLAR CELLS WITH PHOTOSENSITIVE DYES OBTAINED FROM PLANTS OF THE SOUTHERN REGION OF ECUADOR.Four vegetal species of the southern of Ecuador were used as sensitizers for making dye-sensitized solar cells (DSSCs). The effect of type and amount of material, type and time of maceration were tested in order to determine the best conditions of extraction. The extraction of the natural dye was made with acidified ethanol. The sensitizing agents were adsorbed on TiO 2 nanoparticles in small solar cells. The DSSCs made with natural dyes from extracts of blackberry (Rubus glaucus B), mortiño (Solanum americanum Mill), escancel (Iresine herbstii Hook) and beet (Beta vulgaris L) developed an open-circuit tension (Voc) 0.65, 0.5, 0.45 and 0.19 V, respectively. The short-circuit currents (Isc) varies from 2.05 to 19.68 mA cm -2 and the fill factor ranging from 0.61 to 0.69. The DSSCs sensitized with the extract of Rubus glaucus B offered the highest maximum power of 8.83 mW. Thus, the natural dyes used showed great potential as sensitizers in DSSCs, besides being environmentally friendly and their low cost.Keywords: Dye-sensitized solar cell; natural dyes; nanoparticles TiO 2 . INTRODUCCIÓNEn el siglo XXI la humanidad se enfrenta al reto del incremento global de la demanda de energía y el control del nivel de emisiones de CO 2 para reducir el efecto invernadero. Por lo cual surge la necesidad en el desarrollo de fuentes de energías alternativas por medio del desarrollo de energías renovables, asegurando protección y armonía con el medio ambiente. 1 Una de estas fuentes de energía alternativa y renovable es el aprovechamiento de la energía solar, mediante la aplicación en celdas solares. Hoy en día, las celdas solares convencionales son basadas en silicio. Sin embargo, su desventaja son los altos costos de fabricación. 2 Otra fuente de energía son los combustibles fósiles, más económicos pero con las desventajas de ser un recurso no renovable y de alta contaminación. 3 Las celdas solares sensibilizadas con colorantes (DSSCs), han despertado un gran interés desde la publicación de O'regan y Grätzel, 4 debido a que representan una alternativa potencial y relativamente económica en comparación con el silicio que son actualmente los más utilizados.Las DSSCs consisten en un electrodo o ánodo, un contra--electrodo o cátodo, electrolito redox (reducción y oxidación) y un agente sensibilizador. 5 En estas celdas, el colorante sensibilizador juega un papel clave en la absorción de la luz solar y la conversión de energía solar en energía eléctrica. Hoy en día, algunos complejos metálicos y colorantes orgánicos se han sintetizado y usado como sensibilizadores. Por el momento, la mayor eficiencia en DSSCs se da por Ru que contienen compuestos absorbidos en TiO 2 nanocristalino alcanzando un 11.1% y una potencia máxima de 2.429 mW. 6 Aunque tales DSSCs han proporcionado un rendimiento relativamente alto, hay varias desventajas de la utilización de metales nobles, debido a su limitada disponibilidad; por lo tanto su producción es...

show abstract

“…Zhang et al [7] reported that DSSCs based on a D-p-A dye (C217) show a power conversion efficiency of 9.8%.…”

Section: Introductionmentioning

confidence: 99%

Photo-induced intramolecular charge transfer from antenna to anchor groups in phenoxazine dyes

Yang

Liu

Zhou

et al. 2011

Chemical Physics Letters

View full text Add to dashboard Cite

High efficiency and stable dye-sensitized solar cells with an organic chromophore featuring a binary π-conjugated spacer

Cited by 575 publications

References 27 publications

Acene‐Modified Triphenylamine Dyes for Dye‐Sensitized Solar Cells: A Computational Study

Acene‐Modified Triphenylamine Dyes for Dye‐Sensitized Solar Cells: A Computational Study

Celdas solares sensibilizadas con colorantes fotosensibles obtenidos de plantas de la región sur de Ecuador

Photo-induced intramolecular charge transfer from antenna to anchor groups in phenoxazine dyes

Contact Info

Product

Resources

About