Browsing by Author "Wu, Sung-Lin"

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Design and characterization of porphyrin sensitizers with a push-pull framework for highly efficient dye-sensitized solar cells
(2010)
Wu, Sung-Lin
;
Lu, Hsueh-Pei
;
Yu, Han-Ting
;
Chuang, Shu-Han
;
Chiu, Chien-Lan
Novel porphyrin dyes YD14-YD17 with a push-pull framework were synthesized for dye-sensitized solar cells (DSSC); their spectral, electrochemical and photovoltaic properties were investigated. The absorption bands of these porphyrin dyes are broadened and red-shifted upon introduction of electron-donating groups (EDG) to the meso-positions via extension of p-conjugation. Electrochemical tests show that the first oxidation for these porphyrins occurs at a potential greater than that of the I(-)/I(3)(-) redox couple, and attachment of EDGs to the periphery of the porphyrin facilitates electron abstraction. The photovoltaic measurements show that YD14 and YD17 have a power conversion efficiency of similar to 7%. Introduction of EDGs to various meso-positions is demonstrated to be achievable, and porphyrin dyes with appropriate EDGs are promising candidates for highly efficient DSSCs.