We report on the current-voltage (I-V) and capacitance-voltage (C-V) characteristics of the Pd/Ti/n-InP Schottky barrier diodes (SBDs) in the temperature range 160-400 K in steps of 40 K. The barrier heights and ideal...We report on the current-voltage (I-V) and capacitance-voltage (C-V) characteristics of the Pd/Ti/n-InP Schottky barrier diodes (SBDs) in the temperature range 160-400 K in steps of 40 K. The barrier heights and ideality factors of Schottky contact are found in the range 0.35 eV (I-V), 0.73 eV (C-V) at 160 K and 0.63 eV (I-V), 0.61 eV (C-V) at 400 K, respectively. It is observed that the zero-bias barrier height decreases and ideality factor n increase with a decrease in temperature, this behaviour is attributed to barrier inhomogeneities by assuming Gaussian distribution at the interface. The calculated value of series resistance (Rs) from the forward I-V characteristics is decreased with an increase in temperature. The homogeneous barrier height value of approximately 0.71 eV for the Pd/Ti Schottky diode has been obtained from the linear relationship between the temperature-dependent experimentally effective barrier heights and ideality factors. The zero-bias barrier height ( ) versus 1/2kT plot has been drawn to obtain evidence of a Gaussian distribution of the barrier heights and values of = 0.80 eV and = 114 mV for the mean barrier height and standard deviation have been obtained from the plot, respectively. The modified Richardson ln(I0/T2)- ( ) versus 1000/T plot has a good linearity over the investigated temperature range and gives the mean barrier height ( ) and Richardson constant (A*) values as 0.796 eV and 6.16 Acm-2K-2 respectively. The discrepancy between Schottky barrier heights obtained from I-V and C-V measurements is also interpreted.展开更多
目的介绍美罗培南在危重症、脓毒症及脓毒症休克、肾功能不全、病态肥胖、烧伤等特殊机体状态下的PK/PD及给药方案研究进展,为其临床合理应用提供参考。方法查阅国内外相关文献,进行系统的文献整理和综合分析。结果患者特殊的病理生理状...目的介绍美罗培南在危重症、脓毒症及脓毒症休克、肾功能不全、病态肥胖、烧伤等特殊机体状态下的PK/PD及给药方案研究进展,为其临床合理应用提供参考。方法查阅国内外相关文献,进行系统的文献整理和综合分析。结果患者特殊的病理生理状态,可使美罗培南的PK和PD发生重要改变,其中最重要的改变是Vd和CL。多个研究报道,增大美罗培南给药剂量,延长输注时间,可提高目标获得概率(Probability of target attainment,PTA)或累积反应分数(Cumulative fraction of response,CFR),但对于敏感的致病菌常规给药方案仍可得到良好的治疗效果。药物对治疗靶部位的组织穿透力也是影响PD的重要指标。研究发现,美罗培南可以很好的渗透到脑脊液、腹腔、肺部、软组织、前列腺、胰腺等。结论临床医生在使用美罗培南前,应了解患者的病理生理状态,明确病原菌、感染部位,根据PK/PD制定合理的给药方案。展开更多
文摘We report on the current-voltage (I-V) and capacitance-voltage (C-V) characteristics of the Pd/Ti/n-InP Schottky barrier diodes (SBDs) in the temperature range 160-400 K in steps of 40 K. The barrier heights and ideality factors of Schottky contact are found in the range 0.35 eV (I-V), 0.73 eV (C-V) at 160 K and 0.63 eV (I-V), 0.61 eV (C-V) at 400 K, respectively. It is observed that the zero-bias barrier height decreases and ideality factor n increase with a decrease in temperature, this behaviour is attributed to barrier inhomogeneities by assuming Gaussian distribution at the interface. The calculated value of series resistance (Rs) from the forward I-V characteristics is decreased with an increase in temperature. The homogeneous barrier height value of approximately 0.71 eV for the Pd/Ti Schottky diode has been obtained from the linear relationship between the temperature-dependent experimentally effective barrier heights and ideality factors. The zero-bias barrier height ( ) versus 1/2kT plot has been drawn to obtain evidence of a Gaussian distribution of the barrier heights and values of = 0.80 eV and = 114 mV for the mean barrier height and standard deviation have been obtained from the plot, respectively. The modified Richardson ln(I0/T2)- ( ) versus 1000/T plot has a good linearity over the investigated temperature range and gives the mean barrier height ( ) and Richardson constant (A*) values as 0.796 eV and 6.16 Acm-2K-2 respectively. The discrepancy between Schottky barrier heights obtained from I-V and C-V measurements is also interpreted.
文摘目的介绍美罗培南在危重症、脓毒症及脓毒症休克、肾功能不全、病态肥胖、烧伤等特殊机体状态下的PK/PD及给药方案研究进展,为其临床合理应用提供参考。方法查阅国内外相关文献,进行系统的文献整理和综合分析。结果患者特殊的病理生理状态,可使美罗培南的PK和PD发生重要改变,其中最重要的改变是Vd和CL。多个研究报道,增大美罗培南给药剂量,延长输注时间,可提高目标获得概率(Probability of target attainment,PTA)或累积反应分数(Cumulative fraction of response,CFR),但对于敏感的致病菌常规给药方案仍可得到良好的治疗效果。药物对治疗靶部位的组织穿透力也是影响PD的重要指标。研究发现,美罗培南可以很好的渗透到脑脊液、腹腔、肺部、软组织、前列腺、胰腺等。结论临床医生在使用美罗培南前,应了解患者的病理生理状态,明确病原菌、感染部位,根据PK/PD制定合理的给药方案。
