Ruthenium sensitizer with thienothiophene-linked carbazole antennas in conjunction with liquid electrolytes for dye-sensitized solar cells

Chia Yuan Chen, Nuttapol Pootrakulchote, Tzu Hao Hung, Chun Jui Tan, Hui Hsu Tsai, Shaik M. Zakeeruddin, Chun Guey Wu, Michael Grätzel

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

A new heteroleptic ruthenium complex, coded CYC-B12, incorporating an antenna ligand composed of sequential connections of a thienothiophene conjugated bridge and carbazole hole-transport moiety was prepared. This new sensitizer exhibits a lower energy MLCT band centered at 555 nm with a high molar absorption coefficient of 2.24 × 104 M-1 cm-1. The device sensitized by CYC-B12 in conjunction with a volatile electrolyte shows a high photovoltaic efficiency of 9.4% under an illumination of standard global AM 1.5G sunlight. With a low-volatile electrolyte, the cell based on this new sensitizer shows not only a good conversion efficiency of 8.2% but also excellent durability (>96%) under light soaking at 60°C in a simulated sunlight for 1000 h. The difference in the electron recombination kinetics caused by various liquid electrolytes or aging process is also investigated by employing the transient photoelectrical measurements.

Original languageEnglish
Pages (from-to)20043-20050
Number of pages8
JournalJournal of Physical Chemistry C
Volume115
Issue number40
DOIs
StatePublished - 13 Oct 2011

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