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Diploma thesis abstract
Dye-sensitized solar cells with cobalt redox mediators
Student: Iurii Chernikov Supervisor: Dmitriy Paraschuk Dye-sensit ized so lar cell (DSSC) is the one of the most promising t ype of solar cells. Redox mediator is a mixture of oxidized and reduced forms of the substance in which the oxidized form (oxidant) acts as an electron acceptor and is reduced by taking the electrons, and the reduced form of acting as an electron donor and oxidizes, giving electrons . Redox mediator performs the overriding funct ion in DSSC . DSSC record samples prepared using cobalt redox mediators. In this paper we studied the DSSC with reference redox mediator Co(bpy) modification Co(bpyCN)
3 +2/+3 3 +2/+3

and its

, which has a lower redox potential , to verify the possibilit y o f

increasing efficiency by lowering DSSC redox level of the redox mediator. In this work we implement the DSSC assembly technique and implemented three research method: measuring VAC DSSC, measuring the decay kinet ics o f the open circuit vo ltage and measuring the VAC of samples with symmetric electrodes. Our invest igat ions have shown that for the construction of high-efficient DSSC with cobalt redox mediators one should use addit ives in the electrolyte to reduce recombinat ion, select the dye wit h effect ive recovery by mediator and select the solvent with a high degree o f redox mediator disso lut ion. It has been shown that lowering the redox mediator potential can increase open circuit vo ltage and decrease the reco mbinat ion rate of photoanode electrons wit h redox mediator oxidized form. This result suggests the presence o f an inverted Marcus regio n in the reduct ion of the redox mediators, indicat ing the prospects of using cobalt redox mediators with low redox level for improving the efficiency o f DSSC. We have tested two types o f DSSC counter: plat inum and carbon. It has been shown that the electrolyte addit ive 4TBP reduces recovery rate of the Co(bpyCN) DSSC VAC.
3 +2/+3

oxidized form in both counter types, thereby reducing the filling factor