High-performance organic materials for dye-sensitized solar cells: Triarylene-linked dyads with a 4-tert-butylphenylamine donor

Yuan Jay Chang, Po Ting Chou, Szu Yu Lin, Motonori Watanabe, Zhi Qian Liu, Ju Ling Lin, Kew Yu Chen, Shih Sheng Sun, Ching Yang Liu, Tahsin J. Chow

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Abstract

A series of organic dyes were prepared that displayed remarkable solar-to-energy conversion efficiencies in dye-sensitized solar cells (DSSCs). These dyes are composed of a 4-tert-butylphenylamine donor group (D), a cyanoacrylic-acid acceptor group (A), and a phenylene-thiophene-phenylene (PSP) spacer group, forming a D-π-A system. A dye containing a bulky tert-butylphenylene-substituted carbazole (CB) donor group showed the highest performance, with an overall conversion efficiency of 6.70 %. The performance of the device was correlated to the structural features of the donor groups; that is, the presence of a tert-butyl group can not only enhance the electron-donating ability of the donor, but can also suppress intermolecular aggregation. A typical device made with the CB-PSP dye afforded a maximum photon-to-current conversion efficiency (IPCE) of 80 % in the region 400-480 nm, a short-circuit photocurrent density J sc=14.63 mA cm -2, an open-circuit photovoltage V oc=0.685 V, and a fill factor FF=0.67. When chenodeoxycholic acid (CDCA) was used as a co-absorbent, the open-circuit voltage of CB-PSP was elevated significantly, yet the overall performance decreased by 16-18 %. This result indicated that the presence of 4-tert-butylphenyl substituents can effectively inhibit self-aggregation, even without CDCA.

Original languageEnglish
Pages (from-to)572-581
Number of pages10
JournalChemistry - An Asian Journal
Volume7
Issue number3
DOIs
Publication statusPublished - Mar 5 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Organic Chemistry

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