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Published on: September 12, 2014
Oligothiophene-containing coumarin dyes for efficient dye-sensitized solar cells
Kohjiro Hara1, Zhong-Sheng Wang, Tadatake Sato
1National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan. k.hara@aist.go.jp
The Journal of Physical Chemistry. B
|July 21, 2006
Summary
New oligothiophene-coumarin dyes enhance dye-sensitized solar cells (DSSCs). A record 7.4% efficiency was achieved with dye NKX-2677, demonstrating rapid electron injection for efficient solar energy conversion.
Area of Science:
- Materials Science
- Photovoltaics
- Organic Chemistry
Background:
- Dye-sensitized solar cells (DSSCs) are a promising renewable energy technology.
- Developing efficient organic dyes is crucial for improving DSSC performance.
- Oligothiophene and coumarin moieties offer tunable electronic properties for dye design.
Purpose of the Study:
- To synthesize and characterize novel oligothiophene-containing coumarin dyes for DSSCs.
- To evaluate the photovoltaic performance of DSSCs incorporating these new dyes.
- To investigate the electron injection dynamics in DSSCs using transient absorption spectroscopy.
Main Methods:
- Synthesis of functionalized oligothiophene-coumarin dyes.
- Fabrication and characterization of dye-sensitized nanocrystalline TiO(2) solar cells.
- Performance evaluation under simulated AM 1.5G irradiation.
- Transient absorption spectroscopy to study electron injection kinetics.
Main Results:
- Dye-sensitized solar cells (DSSCs) exhibited good incident photon-to-current conversion efficiency (IPCE) from 400-800 nm.
- A peak solar energy-to-electricity conversion efficiency (eta) of 7.4% was achieved with dye NKX-2677.
- Short-circuit current density (Jsc) of 13.5 mA cm(-2), open-circuit voltage (Voc) of 0.71 V, and fill factor (FF) of 0.77 were recorded.
- Electron injection from NKX-2677 to TiO(2) was extremely rapid (<100 fs), exceeding the dye's emission lifetime (1.0 ns).
Conclusions:
- The developed oligothiophene-coumarin dyes are highly effective for DSSC applications.
- Dye NKX-2677 demonstrates excellent performance, achieving a 7.4% conversion efficiency.
- Rapid electron injection and high yield contribute to the efficient operation of these DSSCs.
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