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Molecular engineering of panchromatic unsymmetrical squaraines for dye-sensitized solar cell applications
- Authors
- Choi, Hyunbong; Kim, Jeum-Jong; Song, Kihyung; Ko, Jaejung; Nazeeruddin, Md. K.; Graetzel, Michael
- Issue Date
- 2010
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY, v.20, no.16, pp.3280 - 3286
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY
- Volume
- 20
- Number
- 16
- Start Page
- 3280
- End Page
- 3286
- ISSN
- 0959-9428
- Abstract
- Three unsymmetrical squaraine dyes JK-64, JK-65, and JK-64Hx, containing a bulky spirobifluorene or hexyloxyphenyl unit are designed and synthesized. These sensitizers, when anchored onto a TiO(2) surface, exhibit decreased aggregation as well as enhanced unidirectional flow of electrons. Under standard global AM 1.5 solar conditions, an optimized JK-64Hx sensitized cell gave a short-circuit photocurrent density (J(sc)) of 12.82 mA cm(-2), an open-circuit voltage (V(oc)) of 0.54 V and a fill factor (ff) of 0.75, corresponding to an overall conversion efficiency (eta) of 5.20%.
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