Promoting charge-separation in p-type dye-sensitized solar cells using bodipy

Lefebvre, Jean‐François; Sun, Xue-Zhong; Calladine, James A.; George, Michael W.; Gibson, Elizabeth A.

doi:10.1039/c3cc46133e

Cited by 78 publications

(106 citation statements)

References 25 publications

(40 reference statements)

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“…electron transfer from the photoreduced dye to I 3 − to generate I 2 −. ) . As anticipated, the photocurrent generated as a result of the photolysis of I 3 − ( λ ≈400 nm) decreases slightly from 130 m m I 3 − to 50 m m I 3 − and then drops at 13 m m I 3 − .…”

Section: Resultssupporting

confidence: 51%

“…NiO electrodes were sensitized with 1 (Figure ) and assembled in sandwich cells with a platinized counter electrode. Two series of electrolytes, IOD and TRI , were used and their compositions are given in Table . By changing the ratio of I − to I 3 − , the concentration of free I 2 was varied in the IOD series and the concentration of I 3 − was varied in the TRI series.…”

Section: Resultsmentioning

confidence: 99%

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Does Iodine or Thiocyanate Play a Role in p‐Type Dye‐Sensitized Solar Cells?

2016

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Charge recombination at the NiO/electrolyte interface is one of the performance‐limiting factors that prevent p‐type dye‐sensitized solar cells (p‐DSCs) from matching the efficiency of conventional TiO2 devices. This article describes the role of redox mediator species I−, I3−, and I2 in the charge‐transfer processes at the NiO/electrolyte interface. NiO appears to catalyze the oxidation of iodide but the addition of guanidinium thiocyanate inhibits recombination by forming a complex with I2. This increases the voltage but decreases the current so the efficiency is only slightly improved. These results suggest that new redox electrolytes will be needed if tandem DSCs are to exceed the efficiency of state‐of‐the‐art TiO2 devices.

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Section: Resultssupporting

confidence: 51%

Section: Resultsmentioning

confidence: 99%

Does Iodine or Thiocyanate Play a Role in p‐Type Dye‐Sensitized Solar Cells?

2016

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“…Considering the short charge-separated state lifetime for CAD 1, CAD 2, and P1 and that the dye-regeneration reaction with I 3 − should be diffusion limited (we measured τ reg = 25 ns for a dye with a similar driving force for regeneration as P1), 31 it could be surprising that any of these dyes work in p-DSCs at all. The absorption spectrum of the reduced CAD 1 and CAD 2 overlap with the signal for the formation of I 2 − which is formed during the dye-regeneration process, preventing us from obtaining meaningful kinetic data for this reaction using TA.…”

Section: ■ Discussionmentioning

confidence: 98%

Red-Absorbing Cationic Acceptor Dyes for Photocathodes in Tandem Solar Cells

et al. 2014

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A pair of new donor−π−acceptor dyes that absorb toward the red region of the visible spectrum (CAD 1 and CAD 2) utilizing indolium cationic acceptor units have been synthesized for use in p-type dye-sensitized solar cells (p-DSC). Their optical and electrochemical properties were determined experimentally, including application of ultrafast transient absorption and time-resolved infrared spectroscopies. Our results are supported by computational modeling. NiO-based p-DSCs with CAD 1 and CAD 2 gave short-circuit photocurrent densities of 3.6 and 3.3 mA cm −2 , respectively, which are substantially higher than that of any previous red-absorbing p-DSC. These results are a step toward tandem dye-sensitized solar cells that absorb higher-energy photons at the TiO 2 anode and lower-energy photons at the NiO cathode. Routes to further improve the efficiency of NiO DSCS are also discussed.

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“…One of the main shortcomings of metal complex dyes is their weak absorption in the red region of visible spectrum. [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] In our earlier report, we have designed a different pyridomethene-BF 2 complex, with a similar structure to BODIPY, that exhibited a very large extinction coefficient (ε>5×10 4 M -1 cm -1 ). A high absorption coefficient in the visible wavelength will increase the value of shortcircuit current density (J sc ).…”

Section: Introductionmentioning

confidence: 99%

Pyridomethene–BF₂ complex/phenothiazine hybrid sensitizer with high molar extinction coefficient for efficient, sensitized solar cells

Lin

Chang

et al. 2015

J. Mater. Chem. A

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A series of new pyridomethene-BF2/phenothiazine-hybrid metal-free organic sensitizers K1-K8 containing different πspacers were synthesized and applied in dye-sensitized solar cells (DSSC). The introduction of the pyridomethene-BF2 complex unit to the phenothiazine chromophore displayed a high molar extinction coefficient in favor of light-harvesting. Quantum chemical calculations were performed by using the density functional theory (DFT) at the B3LYP/6-31G (d,p) level to investigate the structural properties and electron density distributions of these dyes. The effect of dyes K1-K8 on the performance of DSSC was investigated systematically with comparisons to the plane phenothiazine dyes R1 and R2. Upon co-adsorption with deoxycholic acid, the dye K3 with a thiophene unit between the phenothiazine and pyridomethene-BF2 units exhibited the best photovoltaic performance. The short-circuit current density (Jsc) was 15.43 mA cm -2 with an open-circuit voltage (Voc) 0.69 V and a fill factor (FF) 0.62, that corresponded to a power-conversion efficiency (η) 6.58% under AM 1.5G irradiation (100 mW．cm -2 ) condition. The n-hexyl chain attached to the thiophene in K4-K5 exhibitted an effect of improving the Voc value. The presence of the phenyl pyridomethene-BF2 moiety at the N(10) atom of phenothiazine in K6-K8 showed a good effect of reducing π-π aggregation. These results revealed the advantage of incorporating a pyridomethene-BF2 group in the dyes for high performance DSSC cells.

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Promoting charge-separation in p-type dye-sensitized solar cells using bodipy

Cited by 78 publications

References 25 publications

Does Iodine or Thiocyanate Play a Role in p‐Type Dye‐Sensitized Solar Cells?

Does Iodine or Thiocyanate Play a Role in p‐Type Dye‐Sensitized Solar Cells?

Red-Absorbing Cationic Acceptor Dyes for Photocathodes in Tandem Solar Cells

Pyridomethene–BF₂ complex/phenothiazine hybrid sensitizer with high molar extinction coefficient for efficient, sensitized solar cells

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Promoting charge-separation in p-type dye-sensitized solar cells using bodipy

Cited by 78 publications

References 25 publications

Does Iodine or Thiocyanate Play a Role in p‐Type Dye‐Sensitized Solar Cells?

Does Iodine or Thiocyanate Play a Role in p‐Type Dye‐Sensitized Solar Cells?

Red-Absorbing Cationic Acceptor Dyes for Photocathodes in Tandem Solar Cells

Pyridomethene–BF2 complex/phenothiazine hybrid sensitizer with high molar extinction coefficient for efficient, sensitized solar cells

Contact Info

Product

Resources

About

Pyridomethene–BF₂ complex/phenothiazine hybrid sensitizer with high molar extinction coefficient for efficient, sensitized solar cells