Photoelectrochemical Effects of Guanidinium Thiocyanate on Dye-Sensitized Solar Cell Performance and Stability

Zhang, Changneng; Huang, Yang; Huo, Zhipeng; Chen, Shuanghong; Dai, Songyuan

doi:10.1021/jp909732f

Cited by 109 publications

(100 citation statements)

References 31 publications

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“…[36] On the other hand, this shift can contribute to the larger photocurrents measured for the "PA side cells". [37] Finally, the experimental curves were fitted with an EC [19] to calculate the counter electrode charge transfer time t CE and electron lifetime t n values for the two cells (the fitted curves were also reported in Figure 7). The obtained lifetime values were 0.28 and 0.25 s for the "PA side" and "CE side" DSSCs, respectively, while the corresponding t CE were 14 and 40 ms, in agreement with the discussion reported above.…”

Section: à3mentioning

confidence: 99%

Electrodes/Electrolyte Interfaces in the Presence of a Surface‐Modified Photopolymer Electrolyte: Application in Dye‐Sensitized Solar Cells

et al. 2015

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Since hundreds of studies on photoanodes and cathodes show that the electrode/electrolyte interfaces represent a key aspect at the base of dye-sensitized solar cell (DSSC) performances, it is reported here that these interfaces can be managed by a smart design of the spatial composition of quasi-solid electrolytes. By means of a cheap, rapid, and green process of photoinduced polymerization, composition-tailored polymer electrolyte membranes (PEMs) with siloxane-enriched surfaces are prepared, and their properties are thoroughly described. When assembled in DSSCs, the interfacial action promoted by the composition-tailored PEMs enhances the photocurrent and fill factor values, thus increasing the global photovoltaic conversion efficiency with respect to the non-modified PEMs. Moreover, the presence of the siloxane-chain-enriched surface increases the hydrophobicity and reduces the water vapor permeation into the device, thus enhancing the cell's durability.

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Section: à3mentioning

confidence: 99%

Electrodes/Electrolyte Interfaces in the Presence of a Surface‐Modified Photopolymer Electrolyte: Application in Dye‐Sensitized Solar Cells

et al. 2015

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“…The weight of the iodine was maintained at one tenth of the total mole amount of thetetrapropyl ammonium iodide. Guanidinium thiocyanate was added as an additive to the electrolyte which is widely used to increase the open circuit voltage (V oc ) of the solar cells and the stability of the electrolyte during the I-V measurements (Yu et al 2010;Zhang et al 2009). …”

Section: Electrolyte Preparationmentioning

confidence: 99%

Application of electrospun cellulose acetate nanofibre membrane based quasi-solid state electrolyte for dye sensitized solar cells

et al. 2017

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Dye Sensitized Solar Cells (DSSCs) are much more eco-friendly, low cost and easy to fabricate devices compared to silicon solar cells. In order to overcome their problems with safety and the long-term stability due to sealing problems, liquid electrolytes employed in these devices are replaced with quasi solid-state or gel electrolytes even though the overall efficiencies are somewhat lower. In this study DSSCs are fabricated and tested by replacing the conventional liquid electrolyte using a quasi-solid state electrolyte comprised of biodegradable electro spun cellulose acetate (CA) nanofibres. DSSCs fabricated with this quasi-solid state electrolytes showed an overall light to electricity conversion efficiency of 4.0% under the illumination of 100 mW cm -2 (AM 1.5). The corresponding values of short circuit current density (J sc ), open circuit voltage (V oc ) and the fill factor (FF) of this device were 9.83mA cm -2 , 699.1 mV and 0.58 respectively.

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“…[ 8,9 ] These additives adsorb on the TiO 2 and decrease the BeT. [ 10 ] Modifi cation of TiO 2 by alkyl silane is another approach to suppress the BeT. [11][12][13] Although these approaches increased the effi ciency of DSSC, the improvement is not very high because the layer thickness is not high.…”

mentioning

confidence: 99%

Band Edge Modulated Polymer Layer to Decrease Back Electron Transfer and Increase Efficiency in Sensitized Solar Cells

Arulkashmir

Sudhakar

Krishnamoorthy

2016

Advanced Energy Materials

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time scale of electron transport from TiO 2 to conducting glass is in milliseconds. [ 7 ] Thus, the increased residence time of the electron in TiO 2 increases the possibility of BeT with the holes in either dyes or electrolyte. In fact, the recombination of electron in TiO 2 with that of the holes in electrolytes has been found to be one of the major causes of decreased DSSC efficiency. Thus, suppression of BeT process is an effective way to improve the DSSC effi ciency. However, the approach should not affect the electron injection from the dyes to the TiO 2 . One of the approaches to suppress the BeT process is the addition of additives in the redox electrolytes. [ 8,9 ] These additives adsorb on the TiO 2 and decrease the BeT. [ 10 ] Modifi cation of TiO 2 by alkyl silane is another approach to suppress the BeT. [11][12][13] Although these approaches increased the effi ciency of DSSC, the improvement is not very high because the layer thickness is not high. The attempt to use longer alkyl chain silanes with an objective of increasing the thickness did not signifi cantly alter the DSSC effi ciency due to the imperfect coverage of the TiO 2 surface. [ 14,15 ] Several inorganic oxide barrier layers such as Al 2 O 3 , HfO 2 , and In 2 O 3 have been explored as barrier layer. [16][17][18][19] These barrier layers were deposited before dye absorption either by chemical bath deposition or by atomic layer deposition. The insulating nature of these layers affects the charge injection process. Furthermore, the energy levels of the barrier layer also affect the electron transfer dynamics. [ 20 ] Organic polymers have been coated on top of TiO 2 in solid state dye sensitized solar cells with a different objective. An ion-ligating polymer with different ionization potential has been used to facilitate cascade electron transport. [ 21 ] Photo electropolymerized PEDOT was used as hole transport layer in a solid state dye sensitized solar cell without any other electrolyte. The effi ciencies of these cells were 5.6%. [ 22 ] Considering this, a barrier layer that does not affect electron transfer from LUMO of the dye to TiO 2 and electrolyte to the HOMO of the dye is desirable. It will be an added advantage, if the layer is prepared by solution process. Toward this objective, we have used semiconducting polymers with commensurate band edges to retard the BeT process ( Figure 1 a). The polymers with the structures shown in Figure 1 b were tested and found out that a polymer with a HOMO and LUMO levels at −5.8 and −3.1 eV, respectively, can improve the DSSC effi ciency by 22%. The effi ciency Recombination of charges residing in the TiO 2 and redox electrolyte is one of the factors affecting the effi ciency of dye sensitized solar cells (DSSCs). To circumvent this recombination, inorganic oxide barrier layers and organic silanes have been coated on TiO 2 /dyes. Due to the insulating nature of these layers, the effi ciency increase is not very impressive. Conducting polymers with different band edges are used to suppress the cha...

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Photoelectrochemical Effects of Guanidinium Thiocyanate on Dye-Sensitized Solar Cell Performance and Stability

Cited by 109 publications

References 31 publications

Electrodes/Electrolyte Interfaces in the Presence of a Surface‐Modified Photopolymer Electrolyte: Application in Dye‐Sensitized Solar Cells

Electrodes/Electrolyte Interfaces in the Presence of a Surface‐Modified Photopolymer Electrolyte: Application in Dye‐Sensitized Solar Cells

Application of electrospun cellulose acetate nanofibre membrane based quasi-solid state electrolyte for dye sensitized solar cells

Band Edge Modulated Polymer Layer to Decrease Back Electron Transfer and Increase Efficiency in Sensitized Solar Cells

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