Efficient azobenzene co-sensitizer for wide spectral absorption of dye-sensitized solar cells |
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Authors: | L Y Zhang S J Zou X H Sun |
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Institution: | School of Chemical Engineering, Northeast Electric Power University, Jilin 132012 P. R. China, Fax: +86-432-64806371, +86-432-64807273 |
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Abstract: | Two azobenzene dyes, Cu(azobenzene-4,4′-dicarboxylate) diethylenediamine]n (ADD), Cd(4,4′-diazenediyldibenzoato)(H2O)]n (DDB), have been designed, synthesized, and characterized as efficient co-sensitizers for dye-sensitized solar cells (DSSC). The optical, charge-transfer, electrochemical and photovoltaic properties of ADD and DDB are investigated by UV-visible spectroscopy, transient surface photovoltage measurement, cyclic voltammetry, and photocurrent–photovoltage measurement. The combination of ADD and DDB in DSSC leads to a wide spectral absorption over the whole visible range (350–700 nm). DSSC with ADD and DDB exhibits a short-circuit photocurrent density as high as 16.96 mA cm−2, open-circuit photovoltage of 0.73 V, a fill factor of 0.57, and overall light conversion efficiency of 7.1% under standard global AM1.5 solar irradiation conditions.The combination of two azobenzene dyes leads to a wide spectral absorption and overall light conversion efficiency of 7.1%. |
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