Two Novel Carbazole Dyes for Dye-Sensitized Solar Cells with Open-Circuit Voltages up to 1 V Based on Br<sup>−</sup>/Br<sub>3</sub><sup>−</sup> Electrolytes

Chao Teng(KTH Royal Institute of Technology), Xichuan Yang(KTH Royal Institute of Technology), Chunze Yuan(KTH Royal Institute of Technology), Chaoyan Li(KTH Royal Institute of Technology), Ruikui Chen(KTH Royal Institute of Technology), Haining Tian(KTH Royal Institute of Technology), Shifeng Li(KTH Royal Institute of Technology), Anders Hagfeldt(KTH Royal Institute of Technology), Licheng Sun(KTH Royal Institute of Technology)
Organic Letters
November 9, 2009
10.1021/ol9022936
Cited by 170Open Access
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Abstract

Dye-sensitized solar cells (DSCs) based on two novel carbazole dyes (TC301 and TC306) and a Br(-)/Br(3)(-) redox mediator in dried CH(3)CN solutions as electrolytes yielded a V(oc) of 1.156 V and a eta value of 3.68% and a V(oc) of 0.939 V and a eta value of 5.22% under simulated AM 1.5, respectively. The dyes TC301 and TC306 have more positive HOMO levels (1.59 and 1.38 V vs NHE) than the redox potential of Br(-)/Br(3)(-)-based electrolytes, which have sufficient driving force to regenerate dyes. Under similar conditions with an I(-)/I(3)(-) instead of a Br(-)/Br(3)(-) redox mediator, DSCs sensitized by the dyes TC301 and TC306 produced a V(oc) of 0.696 V and a eta value of 2.36% and a V(oc) of 0.621 V and a eta value of 4.10%, respectively.

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