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Ultrafast Fabrication of Flexible Dye-Sensitized Solar Cells by Ultrasonic Spray-Coating Technology.

Han HG, Weerasinghe HC, Min Kim K, Soo Kim J, Cheng YB, Jones DJ, Holmes AB, Kwon TH - Sci Rep (2015)

Bottom Line: This study investigates novel deposition techniques for the preparation of TiO2 electrodes for use in flexible dye-sensitized solar cells.These proposed new methods, namely pre-dye-coating and codeposition ultrasonic spraying, eliminate the conventional need for time-consuming processes such as dye soaking and high-temperature sintering.Power conversion efficiencies of over 4.0% were achieved with electrodes prepared on flexible polymer substrates using this new deposition technology and N719 dye as a sensitizer.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, School of Natural Science, Ulsan National Institute of Science and Technology, Ulsan, 689-798, Republic of Korea.

ABSTRACT
This study investigates novel deposition techniques for the preparation of TiO2 electrodes for use in flexible dye-sensitized solar cells. These proposed new methods, namely pre-dye-coating and codeposition ultrasonic spraying, eliminate the conventional need for time-consuming processes such as dye soaking and high-temperature sintering. Power conversion efficiencies of over 4.0% were achieved with electrodes prepared on flexible polymer substrates using this new deposition technology and N719 dye as a sensitizer.

No MeSH data available.


Related in: MedlinePlus

Schematic showing the fabrication of flexible DSCs using a combination of dye soaking and ultrasonic spray technology, pre-dye-coating ultrasonic spray technology, and codeposition ultrasonic spray technology.In all instances, TiO2 electrodes were prepared by ultrasonic spray coating and cold isostatic pressing (CIP).
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f1: Schematic showing the fabrication of flexible DSCs using a combination of dye soaking and ultrasonic spray technology, pre-dye-coating ultrasonic spray technology, and codeposition ultrasonic spray technology.In all instances, TiO2 electrodes were prepared by ultrasonic spray coating and cold isostatic pressing (CIP).

Mentions: Figure 1 shows schematic diagrams of the proposed pre-dye-coating ultrasonic spray and codeposition ultrasonic spray technologies, as well as the conventional dye-soaking process. In the case of the former, pre-dye-coated TiO2 nanopowder suspensions are first prepared by adding a N719 dye solution to P-25 TiO2 nanopowder suspensions (from Degussa), and then sprayed onto an indium tin oxide-coated polyethylene naphthalate (ITO-PEN) flexible substrate to produce a uniformly dye-coated TiO2 film. With the codeposition process, a pre-prepared dye solution and P-25 TiO2 nanopowder suspension are first placed into individual syringe pumps. These are then forced to collide at end of an ultrasonic nozzle prior to being sprayed onto ITO-PEN, thereby forming dye-coated TiO2 electrodes. As can be seen, these new technologies do not require an additional dye soaking procedure or any other complicated TiO2 electrode preparation techniques. Furthermore, the amount of dye on the TiO2 electrode can be easily controlled by changing the concentration of the dye used for pre-dye-coating and/or the injection rate of the dye solution used for spray codeposition. Using these methods, we have succeeded in readily fabricating flexible TiO2 electrodes on large areas of ITO-PEN (10 cm × 1 cm) within a matter of less than twenty minutes, while also accurately controlling the amount of dye on the TiO2 particles. For CIP compression, the as-deposited TiO2 electrodes were first sealed in a plastic bag using a vacuum sealer, and were then compressed at 200 MPa for 10 min to yield flexible TiO2 electrodes containing electrically well-connected TiO2 nano-particles. The thickness of the titania film was also found to be dramatically reduced to as much as 66% of its original thickness. The performance of each of the flexible DSC devices was evaluated using N719 dyes under open-cell conditions.


Ultrafast Fabrication of Flexible Dye-Sensitized Solar Cells by Ultrasonic Spray-Coating Technology.

Han HG, Weerasinghe HC, Min Kim K, Soo Kim J, Cheng YB, Jones DJ, Holmes AB, Kwon TH - Sci Rep (2015)

Schematic showing the fabrication of flexible DSCs using a combination of dye soaking and ultrasonic spray technology, pre-dye-coating ultrasonic spray technology, and codeposition ultrasonic spray technology.In all instances, TiO2 electrodes were prepared by ultrasonic spray coating and cold isostatic pressing (CIP).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4588502&req=5

f1: Schematic showing the fabrication of flexible DSCs using a combination of dye soaking and ultrasonic spray technology, pre-dye-coating ultrasonic spray technology, and codeposition ultrasonic spray technology.In all instances, TiO2 electrodes were prepared by ultrasonic spray coating and cold isostatic pressing (CIP).
Mentions: Figure 1 shows schematic diagrams of the proposed pre-dye-coating ultrasonic spray and codeposition ultrasonic spray technologies, as well as the conventional dye-soaking process. In the case of the former, pre-dye-coated TiO2 nanopowder suspensions are first prepared by adding a N719 dye solution to P-25 TiO2 nanopowder suspensions (from Degussa), and then sprayed onto an indium tin oxide-coated polyethylene naphthalate (ITO-PEN) flexible substrate to produce a uniformly dye-coated TiO2 film. With the codeposition process, a pre-prepared dye solution and P-25 TiO2 nanopowder suspension are first placed into individual syringe pumps. These are then forced to collide at end of an ultrasonic nozzle prior to being sprayed onto ITO-PEN, thereby forming dye-coated TiO2 electrodes. As can be seen, these new technologies do not require an additional dye soaking procedure or any other complicated TiO2 electrode preparation techniques. Furthermore, the amount of dye on the TiO2 electrode can be easily controlled by changing the concentration of the dye used for pre-dye-coating and/or the injection rate of the dye solution used for spray codeposition. Using these methods, we have succeeded in readily fabricating flexible TiO2 electrodes on large areas of ITO-PEN (10 cm × 1 cm) within a matter of less than twenty minutes, while also accurately controlling the amount of dye on the TiO2 particles. For CIP compression, the as-deposited TiO2 electrodes were first sealed in a plastic bag using a vacuum sealer, and were then compressed at 200 MPa for 10 min to yield flexible TiO2 electrodes containing electrically well-connected TiO2 nano-particles. The thickness of the titania film was also found to be dramatically reduced to as much as 66% of its original thickness. The performance of each of the flexible DSC devices was evaluated using N719 dyes under open-cell conditions.

Bottom Line: This study investigates novel deposition techniques for the preparation of TiO2 electrodes for use in flexible dye-sensitized solar cells.These proposed new methods, namely pre-dye-coating and codeposition ultrasonic spraying, eliminate the conventional need for time-consuming processes such as dye soaking and high-temperature sintering.Power conversion efficiencies of over 4.0% were achieved with electrodes prepared on flexible polymer substrates using this new deposition technology and N719 dye as a sensitizer.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, School of Natural Science, Ulsan National Institute of Science and Technology, Ulsan, 689-798, Republic of Korea.

ABSTRACT
This study investigates novel deposition techniques for the preparation of TiO2 electrodes for use in flexible dye-sensitized solar cells. These proposed new methods, namely pre-dye-coating and codeposition ultrasonic spraying, eliminate the conventional need for time-consuming processes such as dye soaking and high-temperature sintering. Power conversion efficiencies of over 4.0% were achieved with electrodes prepared on flexible polymer substrates using this new deposition technology and N719 dye as a sensitizer.

No MeSH data available.


Related in: MedlinePlus