Estimation of the Charge Injection Barrier at a Metal/Organic Semiconductor Interface Based on Accumulated Charge Measurement: The Effect of Offset Bias Voltages

Estimation of the Charge Injection Barrier at a Metal/Organic Semiconductor Interface Based on Accumulated Charge Measurement: The Effect of Offset Bias Voltages
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基于累积电荷测量的金属/有机半导体界面处的电荷注入势垒估计:偏移偏置电压的影响

DOI:
10.1021/acs.jpcc.7b04456
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Yamada Jun-ichi
Yamada Jun-ichi
中科院分区:
化学3区
文献类型:
--
作者:
Tajima Hiroyuki;Yoshida Kesuke;Sato Seiichi;Kadoya Tomofumi;Yamada Jun-ichi

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在当时类型的 Si/SiO2/OS/Ag(OS = 锌酞菁 [ZnPc] 或无金属酞菁 [H2Pc])电容器的累积电荷测量(ACM)中详细检查了偏移偏压对空穴注入有机半导体(OS)层的阈值电压的影响。当 OS 层处于空穴耗尽状态时,阈值很大程度上取决于偏移偏置电压。相反,当操作系统层在空穴累积状态下运行时,阈值几乎恒定。 Ag/OS界面的空穴注入势垒是通过积累区域中的阈值获得的。 H2Pc/Ag 和 ZnPc/Ag 界面的所得值分别为 0.41 和 0.05 eV。研究表明,通过检查 ACM 中的偏移电压依赖性,可以准确估计注入势垒。
The effect of the offset bias voltage on the threshold voltage of the hole injection into the organic-semiconductor (OS) layer was examined in detail in the accumulated charge measurement (ACM) for then-type Si/SiO2/OS/Ag (OS = zinc phthalocyanine [ZnPc] or metal-free phthalocyanine [H2Pc]) capacitor. The threshold highly depends on the offset bias voltages, when the OS layer is in the hole-depletion regime. On the contrary, the threshold was nearly constant when the OS layer operated in the hole-accumulation regime. The hole injection barrier of the Ag/OS interface was obtained by the threshold in the accumulation regime. The obtained values were 0.41 and 0.05 eV for H2Pc/Ag and ZnPc/Ag interfaces, respectively. The study revealed that accurate estimation of the injection barrier is possible by examining the offset voltage dependence in the ACM.
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