Influence of the auxiliary acceptor and π-bridge in carbazole dyes on photovoltaic properties

Influence of the auxiliary acceptor and π-bridge in triarylamine dyes on dye-sensitized solar cells

Four new dyes based on triarylamine donors with different π-bridges have been synthesized and showed the best overall conversion efficiency η of 7.92% (that of N719 dye was 8.53% under the same conditions).

Novel indeno[2,1-b]carbazole donor-based organic dyes for dye-sensitized solar cells

Four novel organic dyes based on indeno[2,1-b]carbazole donors were synthesized. CFT1 showed the best overall conversion efficiency η of 5.97% (J_SC = 12.34 mA cm⁻², V_OC = 0.71 V, and FF = 0.68) under simulated AM 1.5 irradiation (100 mW cm⁻²).

New D-D-π-A triphenylamine-coumarin sensitizers for dye-sensitized solar cells

Three D-D-π-A triphenylamine-coumarin sensitizers were designed and synthesized with a triphenylamine and coumarin double donor and a cyanoacrylic acid acceptor. Thiophene, bithiophene and phenylthiophene were used as π-bridges, respectively, and the effects of different π-bridges on the photophysical properties and photovoltaic performance were investigated. With the incorporation of an additional thiophene unit, the bithiophene π-bridge contributes to better light absorption and hence superior J_SC compared with the thiophene π-bridge. Although the dye with phenylthiophene π-bridge exhibits an inferior absorption spectrum to that with the thiophene π-bridge, it gives a photoelectrical conversion efficiency of 4.99% and exhibits the best photovoltaic performance of the three sensitizers, ascribed to its efficient photon-to-current conversion efficiency, slow charge recombination rate and good electron injection efficiency.