Abstract
Four new metal-free organic dyes QX15–18 based on indeno[1,2-b]indole have been successfully designed and synthesized. These D–π–A type dyes consist of an indeno[1,2-b]indole donor and a benzene or thiophene π-bridge. In an attempt to tune their photoelectric properties, the effects of different acceptor groups including cyanoacrylic acid, rhodanine-3-acetic acid, and 2-(1,1-dicyanomethylene)rhodanine (DCRD) have been investigated. The dye QX15 with a cyanoacrylic acid acceptor exhibited a highest Voc of 813 mV and a high Jsc of 11.0 mA cm−2, generating a highest power conversion efficiency of 6.29%. Meanwhile, the dye QX18 with a DCRD acceptor and a thiophene π-bridge showed a significantly improved Jsc of 11.9 mA cm−2, which could be attributed to its red-shifted absorption spectra and high molar absorption coefficient.
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