Organic non-volatile memories from ferroelectric phase-separated blends
Organic non-volatile memories from ferroelectric phase-separated blends
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DOI：
10.1038/nmat2207
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发表时间：
2008-07-01
期刊：
影响因子：
41.2
通讯作者：
Blom, Paul W. M.
中科院分区：
文献类型：
--
作者：
Asadi, Kamal;De Leeuw, Dago M.;Blom, Paul W. M.
新的非易失性存储器正在研究中，以跟上有机电子学的发展路线图。作为非易失性开关的机制，铁电极化是一个有吸引力的物理性质，因为两个极化可以用作两个二进制能级(2)。然而，在铁电电容器中，极化电荷的读出是破坏性的(3)。目标存储器的功能应该基于电阻开关。在无机铁电体中，电导率和铁电性不能独立调谐。挑战在于开发一种存储介质，在这种介质中，铁电体的有利特性（如双稳定性和非挥发性）可以与半导体提供的有利特性（如导电性和整流性）相结合。在这里，我们提出了一个集成的解决方案，将半导体和铁电聚合物混合到相分离的网络中。铁电体的极化场调制半导体金属接触处的注入势垒。铁电双稳定性与（半）导电性和整流的结合使得溶液处理的非易失性存储器阵列具有简单的跨条结构，可以无损地读出。这里介绍的电可调注入屏障的概念是通用的，可以应用于其他电子设备，如具有集成开/关开关的发光二极管。
New non-volatile memories are being investigated to keep up with the organic-electronics road map(1). Ferroelectric polarization is an attractive physical property as the mechanism for non-volatile switching, because the two polarizations can be used as two binary levels(2). However, in ferroelectric capacitors the read-out of the polarization charge is destructive(3). The functionality of the targeted memory should be based on resistive switching. In inorganic ferroelectrics conductivity and ferroelectricity cannot be tuned independently. The challenge is to develop a storage medium in which the favourable properties of ferroelectrics such as bistability and non-volatility can be combined with the beneficial properties provided by semiconductors such as conductivity and rectification. Here we present an integrated solution by blending semiconducting and ferroelectric polymers into phase-separated networks. The polarization field of the ferroelectric modulates the injection barrier at the semiconductor-metal contact. The combination of ferroelectric bistability with (semi) conductivity and rectification allows for solution-processed non-volatile memory arrays with a simple cross-bar architecture that can be read out nondestructively. The concept of an electrically tunable injection barrier as presented here is general and can be applied to other electronic devices such as light-emitting diodes with an integrated on/off switch.