|Title:||Organic Dyes Containing Carbazole as Donor and π-Linker: Optical, Electrochemical, and Photovoltaic Properties|
Justin Thomas, K. R.
|Published in:||ACS Applied Materials and Interfaces|
|Abstract:||A series of new metal free organic dyes containing carbazole as donor and Ï€-linker have been synthesized and characterized as effective sensitizers for dye sensitized solar cells (DSSCs). The carbazole functionalized at C-2 and C-7 served as electron-rich bridge. The donor property of the carbazole is substantially enhanced on introduction of tert-butyl groups at C-3 and C-6 positions and the oxidation propensity of the dyes increased on insertion of thiophene unit in the conjugation pathway. These structural modifications fine-tuned the optical and electrochemical properties of the dyes. Additionally, the presence of tert-butyl groups on the carbazole nucleus minimized the intermolecular interactions which benefited the performance of DSSCs. The dyes served as efficient sensitizers in DSSCs owing to their promising optical and electrochemical properties. The efficiency of DSSCs utilizing these dyes as sensitizers ranged from 4.22 to 6.04%. The tert-butyl groups were found to suppress the recombination of injected electrons which contributed to the increment in the photocurrent generation (JSC) and open circuit voltage (VOC). A dye with carbazole donor functionalized with tert-butyl groups and the conjugation bridge composed of 2,7-disubstituted carbazole and thiophene fragments exhibited higher VOC value. However, the best device efficiency was observed for a dye with unsubstituted carbazole donor and the Ï€-linker featuring carbazole and bithiophene units due to the high photocurrent generation arising from the facile injection of photogenerated electrons into the conduction band of titanium dioxide (TiO 2) facilitated by the low-lying LUMO. Â© 2014 American Chemical Society.|
|Citation:||ACS Applied Materials and Interfaces (2014), 6(4): 2528-2539|
dye-sensitized solar cells
|Author Scopus IDs:||37051266500|
|Author Affiliations:||Venkateswararao, A., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247 667, India|
Thomas, K.R.J., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247 667, India
Lee, C.-P., Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
Li, C.-T., Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
Ho, K.-C., Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
|Corresponding Author:||Thomas, K.R.J.; Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247 667, India; email: email@example.com|
|Appears in Collections:||Journal Publications [CY]|
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