Abstract
Double layer nanoporous films of Titanium (Ti)/Titanium oxide (TiO2) were fabricated by a combined radio frequency sputtering and sol–gel combustion method and investigated with respect to its photo-anode properties of transparent conductive oxide-less dye-sensitized solar cells (TCO-less DSCs). The porous Ti layer can collect electrons from the TiO2 layer and allows the ionic diffusion of iodide ion/triiodide ion (I-/I3-) through the hole. The porous Ti layer with low sheet resistance (∼2.7Ω/sq.) can be prepared by substrate temperature 300°C under RF power 300W and Ar gas pressure 5mTorr. The Ti/TiO2 double layers prepared by combined RFS/SGC method show the good impedance characteristics. The efficiency (η) of prepared TCO-less DSCs sample is 5.73% [fill factor (ff): 0.76, open circuit voltage (Voc): 0.71V, short-circuit current density (Jsc): 10.61mA/cm2].
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