High permittivity dielectrics for poly(3-alkylthiophene) field-effect transistor devices

High permittivity dielectrics for poly(3-alkylthiophene) field-effect transistor devices
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用于聚(3-烷基噻吩)场效应晶体管器件的高介电常数电介质

DOI:
10.1016/j.orgel.2011.11.001
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发表时间:
2012
影响因子:
3.2
通讯作者:
Sparrowe D
Sparrowe D
中科院分区:
工程技术3区
文献类型:
--
作者:
Sparrowe D

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为了阐明栅极绝缘体的介电常数和表面能(分别由其介电常数 k 和水接触角表示)对有机场效应晶体管 (FET) 性能的影响,我们使用一系列栅极电介质,采用不同侧链长度的聚(3-烷基噻吩)(P3AT)制造了顶栅和底栅 FET 架构。我们发现,此类半导体,包括短丁基 (C4–) 取代衍生物,明显不易受到高 k 电介质对许多有机 FET 性能造成的有害影响。对于底栅器件,我们确定栅极电介质的表面能来主要决定器件的迁移率。
In an attempt to disentangle the effects of permittivity and surface energy of the gate insulator (expressed by its dielectric constant k and water contact angle, respectively) on the performance of organic field-effect transistors (FETs), we fabricated top- and bottom-gate FET architectures with poly(3-alkylthiophenes) (P3ATs) of different side-chain lengths, using a range of gate dielectrics. We find that this class of semiconductor, including the short butyl-(C4–) substituted derivative, is significantly less susceptible to the often detrimental effects that high-k dielectrics can have on the performance of many organic FETs. For bottom gate devices we identify the surface energy of the gate dielectric to predominantly dictate the device mobility.
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