D-pi-A Structured Zn-II-Porphyrin Dyes with Thiophene Moiety for Highly Efficient Dye-Sensitized Solar Cells
- Authors
- Kang, Sung Ho; Kang, Min Soo; Choi, In Taek; Hong, Ji Yeoun; Ju, Myung Jong; Kim, Hwan Kyu
- Issue Date
- 11-3월-2014
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- Co-adsorbents; Dye-sensitized solar cells; Porphyrins; Thiophene; Zinc
- Citation
- CHEMELECTROCHEM, v.1, no.3, pp.637 - 644
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMELECTROCHEM
- Volume
- 1
- Number
- 3
- Start Page
- 637
- End Page
- 644
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/99022
- DOI
- 10.1002/celc.201300075
- ISSN
- 2196-0216
- Abstract
- Herein, we design and synthesize a new D-pi-A zinc porphyrin, enveloped with a long alkyl thiophene unit (Th-ZnP-CNCOOH, TP), for dye-sensitized solar cells. The long alkyl-substituted thiophene unit is incorporated into the porphyrin dye to redshift its absorption wavelength. The effects of the alkyl thiophene moiety at the meso-position of the zinc porphyrin on the optical, electrochemical, and photovoltaic properties of the material are investigated. Dye-sensitized solar cells (DSSCs) prepared using the new dye, co-adsorbed with a simply structured organic co-adsorbent (HC-A4), are fabricated. The obtained TP/HC-A4-sensitized DSSCs exhibit a remarkable enhancement in both short-circuit current (J(SC)) and open-circuit voltage (V-OC), relative to the corresponding single-dye DSSCs, which can be attributed to a combination of the light-harvesting effect from their complementary absorption behavior and the slow charge-recombination process. The device based on TP/HC-A4 co-sensitization yields: J(SC)= 14.4 mAcm(-2), V-OC = 0.62 V, a fill factor FF= 0.75 and an efficiency eta = 6.7%. This performance is superior to those of devices containing either TP (eta = 2.4%) or HC-A4 (eta = 2.8 %), fabricated under the same conditions. The present study indicates that the prevention of dye aggregation, as well as complementary absorption spectra of the porphyrin dyes using co-sensitizers, are key to improving the device performance.
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Collections - Graduate School > Department of Advanced Materials Chemistry > 1. Journal Articles
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