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Abstract
Abstract Three new metal-free organic dyes ( TX1 , TX2 and TX3 ) based on truxene core structure, with triphenylamine as the electron donor, thiophene as the π spacers, and cyanoacetic acid or rhodanine-3-acetic acid as the electron acceptor are designed and synthesized. Their UV–vis absorption spectra, electrochemical and photovoltaic properties were investigated. The cyanoacrylic acid is verified to be a better acceptor unit (meanwhile the anchoring group) compared to the rhodanine-3-acetic acid. And also, two anchoring groups in TX2 could provide stronger adsorption ability on the TiO 2 surface. In addition, the EIS results indicate a slower charge recombination processes for TX2 . As a result, dye TX2 bearing two cyanoacetic acid outperforms the other two dyes, exhibiting the photo-conversion efficiency of 2.64%, with J sc = 5.09 mA cm –2 , V oc = 729 mV, FF = 71.1.
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