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

Wood, Christopher J.; Cheng, Ming; Clark, Charlotte A.; Horvath, Raphael; Clark, Ian P.; Hamilton, Michelle L.; Towrie, Michael; George, Michael W.; Sun, Licheng; Yang, Xichuan; Gibson, Elizabeth A.

doi:10.1021/jp4119937

Cited by 53 publications

(47 citation statements)

References 32 publications

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“…Figure also shows that the magnitude of the dark current at a given potential increases across the series. The charge lifetime ( τ h ) and charge density ( Q OC ) in NiO were determined by using small square wave modulated photovoltage experiments and charge‐extraction experiments . Figure shows τ h versus Q OC and Table summarizes τ h for the IOD series at a similar V OC .…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

2016

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“…The other errors mentioned above ((1), (2), and (5)) can also be characterized in TRMPS measurements, as they reveal themselves through repeating noise patterns in the multiple-probe measurements. Each pump-probe measurement includes uncertainty due to variation in the sample and pump laser conditions.…”

Section: Discussionmentioning

confidence: 99%

A 100 kHz Time-Resolved Multiple-Probe Femtosecond to Second Infrared Absorption Spectrometer

et al. 2016

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We present a dual-amplifier laser system for time-resolved multiple-probe infrared (IR) spectroscopy based on the ytterbium potassium gadolinium tungstate (Yb:KGW) laser medium. Comparisons are made between the ytterbium-based technology and titanium sapphire laser systems for time-resolved IR spectroscopy measurements. The 100 kHz probing system provides new capability in time-resolved multiple-probe experiments, as more information is obtained from samples in a single experiment through multiple-probing. This method uses the high repetition-rate probe pulses to repeatedly measure spectra at 10 µs intervals following excitation allowing extended timescales to be measured routinely along with ultrafast data. Results are presented showing the measurement of molecular dynamics over >10 orders of magnitude in timescale, out to 20 ms, with an experimental time response of <200 fs. The power of multiple-probing is explored through principal component analysis of repeating probe measurements as a novel method for removing noise and measurement artifacts.

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“…The most successful of these has been Warnan et al who realised a 25% IPCE (λ = 620 nm) with a triad (SQ-PMI-NDI) [87]. Wood et al obtained similar results (3.3 mA/cm 2 and 18% IPCE at 625 nm) [88] using an asymmetric TPA based sensitizer. These researchers followed this work up with P1 derivatives containing bodipy acceptor moieties [98].…”

Section: Red and Near Infrared Sensitizersmentioning

confidence: 98%

“…With high quantum efficiencies attained for blue-green absorbing dyes, and general design rules for pDSCs being better understood, it seems reasonable that this should be a high priority area of pDSC development. So far a handful of groups [75,87,88,94,110,137] have produced dyes for pDSCs with substantially red-shifted absorbance. In three cases, squarine has been employed as the electron acceptor.…”

Section: Red and Near Infrared Sensitizersmentioning

confidence: 99%

Developments in and prospects for photocathodic and tandem dye-sensitized solar cells

Nattestad¹,

Perera²,

Spiccia³

2016

Journal of Photochemistry and Photobiology C: Photochemistry Re

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Third generation photovoltaics are based on the concept of providing high conversion efficiencies with low device production costs. As such, second generation concepts, such as Dye-sensitized Solar Cells (DSCs), serve as a good starting point for the development of these new devices. Tandem DSC devices are one example of such a concept, and can be constructed using two photoactive electrodes (one photoanode and one photocathode) inside the one cavity, increasing the theoretical efficiency limit by around 50% as compared to the conventional design. As there has been substantial effort devoted to the development of ntype DSCs, the focus of researchers investigating tandem DSCs has been to create high performance p-type systems, which operate by an analogous, but inverted, mechanism to n-type DSCs.

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

Cited by 53 publications

References 32 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?

A 100 kHz Time-Resolved Multiple-Probe Femtosecond to Second Infrared Absorption Spectrometer

Developments in and prospects for photocathodic and tandem dye-sensitized solar cells

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