Journal
CHEMICAL RECORD
Volume 16, Issue 3, Pages 1311-1336Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/tcr.201500288
Keywords
conjugation; donor-acceptor systems; sensitizers; solar cells; structure-activity relationships
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Funding
- Academia Sinica (AS)
- Ministry of Science and Technology (Taiwan)
- Instrumental Center of Institute of Chemistry (AS)
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This review focuses on our work on metal-free sensitizers for dye-sensitized solar cells (DSSCs). Sensitizers based on D-A--A architecture (D is a donor, A is an acceptor, A is an electron-deficient entity) exhibit better light harvesting than D--A-type sensitizers. However, appropriate molecular design is needed to avoid excessive aggregation of negative charge at the electron-deficient entity upon photoexcitation. Rigidified aromatics, including aromatic segments comprising fused electron-excessive and -deficient units in the spacer, allow effective electronic communication, and good photoinduced charge transfer leads to excellent cell performance. Sensitizers with two anchors/acceptors, D(--A)(2), can more efficiently harvest light, inject electrons, and suppress dark current compared with congeners with a single anchor. Appropriate incorporation of heteroaromatic units in the spacer is beneficial to DSSC performance. High-performance, aqueous-based DSSCs can be achieved with a dual redox couple comprising imidazolium iodide and 2,2,6,6-tetramethylpiperidin-N-oxyl, and/or using dyes of improved wettability through the incorporation of a triethylene oxide methyl ether chain.
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