期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2016, 期 21, 页码 3536-3549出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201600353
关键词
Sensitizers; Solar cells; Energy conversion; Conjugation; Dyes; Pigments
资金
- Mahidol University
- Office of the Higher Education Commission, Thailand
- Mahidol University under the National Research Universities Initiative
- Center of Excellent for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University
The synthesis, photophysical and electrochemical properties, and photovoltaic performances in dye-sensitized solar cells (DSSCs) of five new metal-free organic sensitizers with a carbazole moiety as the electron donor are reported. The compounds contain a thiophene at various positions and a cyanoacrylic acid unit as the electron acceptor. The position of the thiophene moiety affected both the photophysical and electrochemical properties, leading to conversion efficiencies of 1.44 to 4.57% under AM 1.5 solar conditions (100 mWcm(-2)). The best performance and longest electron lifetime were found when a thiophene was located on both donor and acceptor sites. The DSSC showed a short-circuit current (J(sc)) of 8.59 mA/cm(2), an open-circuit photovoltage (V-oc) of 0.75 V, and a fill factor (FF) of 0.71. The position of the -conjugated bridges not only affects the absorption spectra and the energy levels of the sensitizers, but also adjusts the electron lifetime.
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