流体静压力对锗隧道二极管伏安特性的影响

本文报导了在流体静压力18000kg/cm²的范围内,锗隧道二极管伏安特性随压力变化的实验结果。测量了十六只锗隧道二极管的峯值电流I_P、峯值电压V_P、谷值电流I_V、谷值电压V_V、指数过剩电流I_X和反向隧道电流等参数与流体静压力的关系。结果表明:峯值电流I_P相对于压力的半对数作图为斜率不同的二段下降直线,在5000—9000kg/cm²范围内有转折点;峯值电压随压力改变较小;在误差范围内谷值电压不随压力而改变。对于大部分被测管子,谷值电流与压力的关系类似于峯值电流与压力的关系;随着压力的增加,指数过剩电流区向高偏压方向移动。讨论了峯值电流及指数过剩电流随压力变化的规律和其他结果。认为转折点的存在是表明隧道跃迁机构的改变;由指数过剩电流区固定电流值测偏压随压力改变,求得禁带宽度的压力系数与其他方法获得的结果很好符合。

PRESSURE DEPENDENCE OF THE CURRENT-VOLTAGE CHARACTERISTICS OF GERMANIUM ESAKI DIODES

Effects of hydrostatic pressure up to 18000 kg/cm² on the current-voltage characteristics of germanium Esaki diodes are reported. The pressure dependence of the peak currents I_P, valley currents I_V, peak voltages V_P, valley voltages V_V, and the exponential excess currents I_X have been studied on sixteen germanium Esaki diodes. The results indicate that the semi-logarithmic plot of peak currents I_P versus pressure P consists of two straight lines with different negative slopes. The intersecting point occurs in a pressure range from 5000 kg/cm² to 9000 kg/cm². The peak voltages V_P change only slightly with pressure, while the valley voltages V_V are independent of pressure within the limit of experimental errors. For most diodes the pressure dependence of the valley currents is the same as that of peak current. The onsets of the exponential excess currents move toward high voltages with pressure. The pressure dependences of the peak currents and exponential currents have been discussed. It is shown that the presence of two straight lines with different slopes may be related to different tunnelling processes. A pressure coefficiant of the energy gap E_g can be determined at a constant exponential excess current; the result is in good agreement with that given by other authors.