Hybrid semiconductor electrodes for light-driven photoelectrochemical switches

作者：Long, Min-ce; Beranek, Radim; Cai, Wei-min; Kisch, Horst^*

来源：Electrochimica Acta, 2008, 53(14): 4621-4626.

DOI：10.1016/j.electacta.2008.01.077

• photoelectrochemical switches
• semiconductors
• photocurrent
• optoelectronics
• nanotechnology

Hybrid (n-/p-type) semiconductor electrodes represent a viable strategy for fabrication of wavelength-controlled optoelectronic switches. Four hybrid electrodes (BiVO4/Co3O4, BiVO4/CuO, TiO2/Co3O4, TiO2/CuO) were prepared in the form of random assemblies of nanocrystalline powders on ITO-glass and the wavelength dependence of their photocurrent response was investigated. The former three electrodes exhibited wavelength-control led switching of photocurrent direction, whereas the latter one showed exclusively cathodic photocurrents. The prerequisite for the switching effect is that the potentials of the valence and conduction band edges of an n-type component are more positive than those of a p-type one. Further key parameters influencing the photocurrent response are the applied potential and the presence of electron and hole scavengers.

• 出版日期2008-5-30
• 单位上海交通大学