Coumarin dye with ethynyl group as p-spacer unit for dye sensitized solar cells

C1-LEN coumarin dye, containing an ethynyl conjugated bridge was tested as a new chromophore for dye-sensitized solar cells (DSSCs). Investigation on the relationship of dye structure, optical properties, electrochemical properties and performance of DSSCs is described. The C1-LEN-sensitized solar c...

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Bibliographic Details
Main Author: Torres, Erica (author)
Other Authors: Sequeira, S. (author), Parreira, P. (author), Mendes, Paulo (author), Silva, Tiago J. L. (author), Lobato, Killian (author), Brites, Maria João (author)
Format: article
Language:eng
Published: 2016
Subjects:
Solar cells
Dyes
Alkyne bridge 
Electrochemical impedance spectroscopy
Coumarin
Online Access:http://hdl.handle.net/10400.9/2894
Country:Portugal
Oai:oai:repositorio.lneg.pt:10400.9/2894
Description
Summary:C1-LEN coumarin dye, containing an ethynyl conjugated bridge was tested as a new chromophore for dye-sensitized solar cells (DSSCs). Investigation on the relationship of dye structure, optical properties, electrochemical properties and performance of DSSCs is described. The C1-LEN-sensitized solar cells showed an overall conversion efficiency of 2.2% (JSC = 6.11 mA/cm2, VOC = 547 mV, FF = 0.66), which corresponds to 68% of N719-based device efficiency, fabricated under similar conditions. Electrochemical impedance spectroscopy (EIS) analysis reveals that charge recombination at the nanocrystalline TiO2/dye/redox electrolyte interface is similar for C1-LEN and N719 sensitized solar cells, i.e., charge recombination is not the factor limiting the performance of C1-LEN device.

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