Figure 4.

Nyquist plots of the impedance data of ZnO nanocomb-based DSSCs. Inset shows the equivalent circuit model of the DSSCs, whereRsis the resistance of redox electrolyte solution,RCTthe charge transfer resistance at the interface of electrolyte and ZnO nanocombs, [RCT] is the charge transfer resistance at the interface of ZnO nanocombs and TCO [RZnO/TCO], is the capacitance of accumulation (of e-) layer of the ZnO nanocombs [CACC] andCSCspace charge capacitance

Umar Nanoscale Research Letters 2009 4:1004-1008   doi:10.1007/s11671-009-9353-3