Synthesis of TiO(2) nanoframe and the prototype of a nanoframe solar cell.
Nanoframes containing 20 nm diameter TiO(2) nanowire arrays were synthesized with polymer templates via cathodic sol-gel deposition followed by 450 degrees C sintering. Raman spectra indicated that they are composed of pure anatase TiO(2). The nanowire array inside the nanoframe was confirmed to be single crystalline by high resolution TEM. Dye-sensitized solar cells based on this nanoframe were fabricated and the effects of the top cover in the nanoframe, which is the only difference between nanoframe cells and nanowire cells, were investigated. The results show that the top cover does not prevent the I( - ) and I(3)( - ) ions underneath from diffusing freely in the electrolyte and causes no deterioration of the cell performance. The nanoframe cell is a promising device in which nanowire arrays are strengthened and the effective internal surface area has the potentiality to be increased without sacrificing the advantages of nanowire cells compared to nanoparticle cells.
Chen
Ying
Y
Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA. mihuhou@stanford.edu
Kim
Ho-Cheol
HC
McVittie
Jim
J
Ting
Chiu
C
Nishi
Yoshio
Y