氧化铁电极的半导体性能和光电化学——Ⅳ、阳极形成及热形成氧化铁电极的光电化学实验研究

本文指出, 由于热形成氧化铁电极光电流响应的瞬态性质, 所以正用锁定放大器测量出的数值大大超过其代数平均值。阳极形成铁钝化膜的光电响应与热形成氧化铁的相类似, 但有一定差别。目前的实验水平尚不足以监测钝化膜形成过程中的结构性质。但实验证明膜基本形成后, 在理想情况下, 光电流与膜厚在一定范围内成正比。在膜基本形成前, 则光电流之值较大, 偏离正比关系。

SEMICONDUCTIVE PROPERTIES AND PHOTOELECTROCHEMISTRY OF IRON OXIDE ELECTRODES Ⅳ. Experimental photoelectrochemistry Studies of Anodic-formed and Thermal-formed Iron Oxide Electrodes

In this article, the prominent transient characteristic of photocurrent on thermal-formed iron oxide electrode was discussed. This accounts for the fact that photocurrent values measured with lock-in amplifier greatly exceed their average algebraic values. The photoresponse of anodic-formed iron oxide passive film is similar to that of thermal-formed with some differences. Our present experimental technique is still insufficient for monitoring structural changes of film during the formation of the latter. Nevertheless, our results showed after the film was principally formed, photocurrent is proportional to film thickness. Before this period, there is a positive deviation of photocurrent and the linear relationship does not hold.