n-InP在Fe^(3+)/Fe^(2+)溶液中光脉冲暂态行为研究 Ⅱ.负载电阻及还原态浓度的影响

A STUDY OF PULSED LIGHT-INDUCED TRANSIENT BEHAVIORS AT n-InP ELECTRODE IN Fe^(3+)/Fe^(2+) Ⅱ. EFFECTS OF LOAD RESISTANCE AND FERROUS ION CONCENTRATION

本文应用光脉冲技术研究了负载电阻及还原态浓度对n-InP在Fe^(3+)/Fe^(2+)溶液中暂态行为的影响,结果表明,光电流表减呈双指数形式,增大负载电阻,峰值光电流减小,衰减时间常数增大。增大还原态浓度,峰值光电流增大,衰减时间常数减小。

In this paper the transient behaviors of n-InP in Fe3+/Fe2+ solution are studied using pulsed light technique. The effects of load resistance and Fe2+ concentration on the response are observed.From the peak position of the response it can be regarded that the electrode is in the pseudo-stable state at the peak because the production and the separation of photo- indused carriers are very fast. The peak current increases with decreasing load resistance and increasing the concentration of ferrous ion. It agrees with the output characteristic of general cell.The decay process of the response can be explained by a RC equivalent circuit and follows the law of dual-exponential.The time constants increase linearly with increasing the load resistance. From the slope of the lines the capacities of the space charge layer and the surface states can be calculated. In-creaing the concentration of ferrous ion decrease the time constants.