One-dimensional titania nanoscale materials (1DTNM) have been investigated for attainment of highly efficient solar cells.It is important to make clear the reason for necessity of 1DTNM for attainment of higher efficient dye-sensitized solar cells (DSSCs) through theoretical consideration and its verification based on the experimental evidences. In this work first we present that DSSCs with electrodes composed of three kinds of highly crystalline 1DTNM synthesized in our laboratory, i.e., single crystal-like network structure of titania nanowires (TNWs), titania nanorods (TNRs)and titania nanochains (TNCs), showed high light-to-electricity conversion efficiency around 9%. Next, necessity of highly crystalline 1DTNM for fabricating highly efficient DSSCs is deduced based on the theoretical consideration of electron transport processes derived from Nyquist plots obtained by electrochemical impedance spectroscopy (EIS) and I-V measurement. We verify then the consideration by an intentional experiment, measuring the electron transport properties by EIS on the cells with electrodes made of single crystal-like TNWs, a representative of highly crystalline 1DTNM, and P-25 with various TNW contents.

Verification of necessity of 1D titania nanoscale materials for dye-sensitized solar cells

247th National Meeting (2014)

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