No abstract

Carbon nanotubes (CNTs) were used as a counter electrode of a dye sensitized solar cell (DSC) instead of a Pt counter electrode. The CNT electrodes were fabricated by growing CNTs on metal substrates by microwave plasma enhanced chemical vapor deposition (MPCVD). The size and the amount of CNTs that varied with the microwave power of MPCVD improve the electrochemical characteristics of the CNT electrode which is superior to that of Pt counter electrode. The conversion efficiency of DSCs with the CNT counter electrodes was comparable to that with the Pt counter electrode taking into account of the incident light availability. This study suggests that the CNT counter electrode directly grown on metal substrate be promising to accomplish the high energy conversion efficiency of DSC.

An infrared CO 2 laser was used for regional heating to study the heating effect on hot filament chemical vapor deposition of diamond-like carbon formation on Si(100) face substrates. The substrate surface temperature was about 450-500 • C. The power of the laser called low, medium, and high raised the temperature of the substrate locally by 25, 45, and 55 • C, respectively. At medium laser power, at the central laser beam region, a narrow Raman peak centered at 1438 cm −1 was detected. It can be concluded that this region has good-quality DLC. This moderate high-frequency peak corresponds to a fourfold-rotation-symmetry atom in an amorphous carbon network from the tight-binding molecular dynamics simulation of Wang and Ho.