Hysteresis mechanism in low-voltage and high mobility pentacene thin-film transistors with polyvinyl alcohol dielectric

Hysteresis mechanism in low-voltage and high mobility pentacene thin-film transistors with polyvinyl alcohol dielectric
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聚乙烯醇电介质低压高迁移率并五苯薄膜晶体管的磁滞机制

DOI:
10.1063/1.4737173
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发表时间:
2012-07
影响因子:
4
通讯作者:
Yang, Yudan
Yang, Yudan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang, Wei;Ma, Dongge;Pan, Su;Yang, Yudan

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本文研究了以聚乙烯醇(PVA)为栅介质的有机薄膜晶体管(OTFT)的迟滞机理。通过检查OTFT与阻挡聚合物层之间的栅极和PVA或通道和PVA,我们确认的滞后的起源是由注入的空穴从栅极和/或从通道和被困在界面的并五苯/PVA和PVA体。提出了一种减小迟滞的方法。因此,并五苯OTFT的自由滞后和1.8厘米2/Vs的高迁移率是通过在低工作电压的三层聚合物电介质实现的。
In this letter, the hysteresis mechanism of organic thin-film transistors (OTFTs) with polyvinyl alcohol (PVA) as gate dielectric is studied. By examining OTFTs with a blocking polymer layer between gate and PVA or between channel and PVA, we confirm that the origin of the hysteresis is caused by the holes injected from the gate and/or from the channel and trapped in the interface of pentacene/PVA and the PVA bulk. A method is proposed to reduce the hysteresis. As a result, a pentacene OTFT with free-hysteresis and high mobility of 1.8 cm2/Vs is achieved by a triple-layer polymer dielectric at low-operating voltages.
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