Large photocurrent generation in dye-sensitized ZnO solar cells

Saito, Masaru; Fujihara, Shinobu

doi:10.1039/b806096g

Cited by 274 publications

(181 citation statements)

References 22 publications

(17 reference statements)

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“…This efficiency is attractive considering the film thickness is only 5 m and no scattering layer is added. 4 For device ͑d͒, the dye loading is also increased by 19% as compared to that for device ͑c͒ under similar experimental conditions, which indicates that there is an increase in surface area of the photoelectrode upon Zn͑OAc͒ 2 treatment.…”

mentioning

confidence: 53%

“…2 In addition, ZnO is widely available with high electron mobility. 3 Up to date, the highest efficiency for ZnO-based DSSCs is reported to be 6.58%, 4 which is lower than that for devices based on TiO 2 photoelectrodes. This is due to the poor chemical stability of ZnO in acidic dye solution and the formation of Zn 2+ /dye complexes that could block the injection of electrons from the dye molecules to the semiconducting electrodes.…”

mentioning

confidence: 96%

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Facile construction of nanofibrous ZnO photoelectrode for dye-sensitized solar cell applications

Zhang

Zhu

Liu

et al. 2009

Applied Physics Letters

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A facile method to prepare nanofibrous ZnO photoelectrodes with tunable thicknesses by electrospinning is reported. A “self-relaxation layer” is formed spontaneously between ZnO nanofibers and fluorine-doped SnO 2 (FTO) substrate, which facilitates the release of interfacial tensile stress during calcination, resulting in good adhesion of ZnO film to FTO substrate. Dye-sensitized solar cells (DSSCs) based on the nanofibrous ZnO photoelectrodes are fabricated and an energy conversion efficiency of 3.02% is achieved under irradiation of AM 1.5 simulated sunlight with a power density of 100 mW cm −2, which shows good promise of electrospun nanofibrous ZnO as the photoelectrode in DSSCs

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mentioning

confidence: 53%

mentioning

confidence: 96%

Facile construction of nanofibrous ZnO photoelectrode for dye-sensitized solar cell applications

Zhang

Zhu

Liu

et al. 2009

Applied Physics Letters

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“…However, the efficiencies of ZnO based DSSCs still remain lower than those of TiO 2 based devices. The highest efficiency reported to date is 6.6% under AM 1.5 conditions, 8 which is approximately half of the best efficiency for TiO 2 . 9 Efficiency of DSSCs relies on many factors.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted Hydrothermal Synthesis of Structure-controlled ZnO Nanocrystals and Their Properties in Dye-sensitized Solar Cells

Sun

Sugiura

et al. 2017

Electrochemistry

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Microwave-assisted hydrothermal synthesis of ZnO nanocrystals has resulted in two distinctive structures: hexagonal bi-pyramidal (HBP) and nano-sheet (NS) shapes from Zn(CH 3 COO) 2 solutions containing triethanolamine or benzene tetracarboxylic acid as structure directing agents, respectively. Observation by field-emission scanning electron microscope, high resolution transmission electron microscope as well as analysis of selected area electron beam diffraction patterns revealed that the predominantly exposed facets of HBP and NS ZnO are (102) and (100) faces, occupying 84 and 76% of the total surface area, respectively. Adsorption of D149 and eosin Y photosensitizer dyes onto HBP and NS ZnO was studied in comparison with a randomly structured commercial ZnO nanocrystal (MZ). Density of dye packing was found to be in the order of HBP > MZ > NS, for which HBP was 2 to 5 times higher than NS. Consequently, dye-sensitized solar cells employing HBP ZnO exhibited the highest short circuit photocurrent, but also the lowest open circuit voltage. By contrast, the DSSCs employing NS ZnO exhibited the highest voltage among the three.

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“…The shortest pathway for electron transfer reduced the probability of the electrons being recaptured and considerably increased the transfer velocity of the photo-generated electrons from the conduction band to the external circuit. The response time in the low-voltage region depends on the surface trap density in the photoanode [35]. The OCVD results show that the response time in the DSSCs based on the SNC_Z (1:0.5) photoanode is higher than that in the DSSCs based on the SNC photoanode in the low V oc region, indicating that the SNC_Z (1:0.5) photoanode has a higher surface trap density than that without the LZO layer.…”

Section: Resultsmentioning

confidence: 84%

“…The response time in the low-voltage region depends on the surface trap density in the photoanode [35]. The OCVD results show that the response time in the DSSCs based on the SNC_Z (1:0.5) photoanode is higher than that in the DSSCs based on the SNC photoanode in the low Voc region, indicating that the SNC_Z (1:0.5) photoanode has a higher surface trap density than that without the LZO layer.…”

Section: Resultsmentioning

confidence: 85%

Effect of Photoanode Design on the Photoelectrochemical Performance of Dye-Sensitized Solar Cells Based on SnO2 Nanocomposite

Hung

Bhattacharjee

2016

Energies

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Li-doped ZnO (LZO) aggregated nanoparticles are used as an insulating layer in SnO 2 nanocomposite (SNC) photoanodes to suppress the recombination process in dye-sensitized solar cells (DSSCs). Various weight percentages of SnO 2 nanoparticles (SNPs) and SnO 2 nanoflowers (SNFs) were used to prepare SNC photoanodes. The photocurrent-voltage characteristics showed that the incorporation of an LZO insulating layer in an SNC photoanode increased the conversion efficiency of DSSCs. This was due to an increase in the surface area, charge injection, and charge collection, and the minimization of the recombination rate of photoanodes. Electrochemical impedance spectroscopy (EIS) results showed lower series resistance, charge injection resistance, and shorter lifetimes for DSSCs based on an SNC photoanode with an LZO insulating layer. The open circuit voltage and fill factor of the DSSCs based on SNC photoanodes with an LZO insulating layer significantly increased. The DSSC based on a SNC photoanode with a SNC:SNF weight ratio of 1:1 had a high current density of 4.73 mA/cm 2 , open circuit voltage of 630 mV, fill factor of 69%, and efficiency of 2.06%.

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Large photocurrent generation in dye-sensitized ZnO solar cells

Cited by 274 publications

References 22 publications

Facile construction of nanofibrous ZnO photoelectrode for dye-sensitized solar cell applications

Facile construction of nanofibrous ZnO photoelectrode for dye-sensitized solar cell applications

Microwave-assisted Hydrothermal Synthesis of Structure-controlled ZnO Nanocrystals and Their Properties in Dye-sensitized Solar Cells

Effect of Photoanode Design on the Photoelectrochemical Performance of Dye-Sensitized Solar Cells Based on SnO2 Nanocomposite

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