Electron transport and recombination in dye-sensitized solar cells with ionic liquid electrolytes

Paulsson, Heléne; Kloo, Lars; Hagfeldt, Anders; Boschloo, Gerrit

doi:10.1016/j.jelechem.2005.09.011

Cited by 59 publications

(48 citation statements)

References 22 publications

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“…Electron transport becomes more rapid at higher light intensities, as is the case for dye sensitized solar cells based on colloidal TiO 2 . The transport times are similar to those found for colloidal TiO 2 films under identical conditions [18,19]. This behavior can be explained from a mul- tiple-trapping model in which an exponentially increasing density of traps towards the conduction band is assumed [7,20].…”

Section: Resultssupporting

confidence: 77%

“…The extracted charge is approximately proportional to the film thickness. The extracted charge for the sputter deposited films are comparable with those recorded for films based on colloidal TiO 2 [18,19]. Interestingly, the extracted charge appears to follow a logarithmic dependence on the current density rather than a power-law dependence as is found in films based on colloidal TiO 2 .…”

Section: Resultssupporting

confidence: 71%

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Electron transport and recombination in dye sensitized solar cells fabricated from obliquely sputter deposited and thermally annealed TiO2 films

Waita

Aduda

Mwabora

et al. 2007

Journal of Electroanalytical Chemistry

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Dye sensitized solar cells based on annealed titanium dioxide films prepared by oblique reactive DC magnetron sputtering have been investigated in detail. Electron transport and recombination were studied using intensity-modulated photocurrent and photovoltage spectroscopy. Electron transport time as well as lifetime were found to increase upon lowering of the light intensity and to increase upon increasing the thickness of the TiO 2 film. The properties are very similar to those observed for solar cells based on colloidal TiO 2 films despite the morphologies being very different. In all cases, films are composed of a porous assembly of TiO 2 nanocrystals. Grain boundaries with associated trap and/or energy barriers may explain the observed transport properties.

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Section: Resultssupporting

confidence: 77%

Section: Resultssupporting

confidence: 71%

Electron transport and recombination in dye sensitized solar cells fabricated from obliquely sputter deposited and thermally annealed TiO2 films

Waita

Aduda

Mwabora

et al. 2007

Journal of Electroanalytical Chemistry

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“…To overcome this problem there is research into many alternate electrolytes. These include: ionic liquids [24], plastic crystals [25] and solid state electrolytes [26]. Currently none of these alternatives are as efficient as the liquid electrolyte currently employed.…”

Section: Photovoltaic Cellsmentioning

confidence: 99%

A Power Management Architecture for Sensor Nodes

Eliasson

Lindgren

Delsing

et al. 2007

2007 IEEE Wireless Communications and Networking Conference

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Abstract-Wireless sensor nodes are a versatile, generalpurpose technology capable of measuring, monitoring and controlling their environment. Even though sensor nodes are becoming ever smaller and more power efficient, there is one area that is not yet fully addressed; Power Supply Units (PSUs). Standard solutions that are efficient enough for electronic devices with higher power consumption than sensor nodes, such as mobile phones or PDAs, may prove to be ill suited for the extreme low-power and size requirements often found on wireless sensor nodes. In this paper, a system-level design of a Power Management Architecture (PMA) is presented. The PMA is an integration of PSU hardware and various software components, and is capable of supplying a sensor node with energy from multiple sources, as well as providing status information from the PSU. The heart of the architecture is a context-and power-aware Task manager, which controls when the nodes low-power modes are activated, and is highly integrated with PSU hardware as well as other software components in the system. Its main responsibility is to schedule when energy consuming tasks can be dispatched. Depending on the task priority and system configuration, a task can be either dispatched, discarded or delayed. This approach ensures that only critical tasks will be allowed to use the battery, and that the system will be powered by renewable energy when performing other non-critical tasks.

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“…In addition to this, it is also of paramount importance to identify appropriate chemical/physical parameters that have to be analyzed in conjunction with the temporal recording of the paradigmatic DSC quantities [short-circuit current density (J sc ), open-circuit potential (V OC ), fill factor (FF), and overall efficiency (g)] for assessing the causes of DSC performance degradation under the adopted conditions of stress [2]. In this regard, in-situ techniques, based on the determination of optical and electrical parameters, like electrochemical impedance spectroscopy (EIS) [26,27], intensity-modulated photocurrent spectroscopy (IMPS) [28], and intensity-modulated photovoltage spectroscopy (IMVS) [29] have been profitably used for the study of the aging mechanisms that act on DSCs. Other spectroscopic and imaging techniques like IR [30], UV-Vis [31], and spatially resolved mapping of photocurrent [32] have been also used as complementary methods together with transient absorption techniques [33].…”

Section: Introductionmentioning

confidence: 99%

Emission spectra and transient photovoltage in dye-sensitized solar cells under stress tests

et al. 2012

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Dye-sensitized solar cells have been tested before, during, and after stress tests performed either under intense Xe-lamp illumination (equivalent to 1 sun up to 2.5 sun) or under thermal cycles between room T and 80 A degrees C. In-situ emission spectra and transient photovoltage decay curves have been taken to monitor the cell aging conditions. Incipient degradation phenomena in aged cells can be detected by changes in emission intensity, maximum photovoltage and in the time constant of photovoltage decay. UV-filtering of the Xe beam can prevent such cell degradation, provided the cell overheating is avoided

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Electron transport and recombination in dye-sensitized solar cells with ionic liquid electrolytes

Cited by 59 publications

References 22 publications

Electron transport and recombination in dye sensitized solar cells fabricated from obliquely sputter deposited and thermally annealed TiO2 films

Electron transport and recombination in dye sensitized solar cells fabricated from obliquely sputter deposited and thermally annealed TiO2 films

A Power Management Architecture for Sensor Nodes

Emission spectra and transient photovoltage in dye-sensitized solar cells under stress tests

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