4,5‐Diazafluorene‐Based Donor–Acceptor Small Molecules as Charge Trapping Elements for Tunable Nonvolatile Organic Transistor Memory,Advanced Science

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4,5‐Diazafluorene‐Based Donor–Acceptor Small Molecules as Charge Trapping Elements for Tunable Nonvolatile Organic Transistor Memory
Advanced Science ( IF 14.3 ) Pub Date : 2018-09-06 , DOI: 10.1002/advs.201800747
Yang Yu ₁ , Lin-Yi Bian ₁ , Jian-Guo Chen ₁ , Qi-Hao Ma ₁ , Yin-Xiang Li ₁ , Hai-Feng Ling ₁ , Quan-You Feng ₁ , Ling-Hai Xie ₁ , Ming-Dong Yi ₁ , Wei Huang _{1,

2}

Affiliation

Three diazafluorene derivatives triphenylamine (TPA)(PDAF)_n (n = 1, 2, 3) serving as small molecular elements are designed and synthesized via concentrated sulfuric acid mediated Friedel–Crafts reaction. With highly nonplanar topological configuration, TPA(PDAF)₃ shows weaker intermolecular interaction in the solid states and thus exhibits single nanomolecular behavior, which is crucial for charge stored and retained in an organic field‐effect transistor (OFET) memory device. Furthermore, diazafluorene derivatives possess a completely separate highest occupied molecular orbital/lowest unoccupied molecular orbital, which offers ideal hole and electron trapping sites. As charge storage elements, triphenylamine groups provide the hole trapping sites, while diazafluorene units provide the electron trapping sites and act as a hole blocking group to restrain the leakage of stored holes trapped in triphenylamine. The pentacene‐based OFET memory device with solution‐processing TPA(PDAF)₃ shows a good hole‐trapping ability, high hole trapping density (4.55 × 10¹² cm⁻²), fast trapping speed (<20 ms), a large memory window (89 V), and a tunable ambipolar memory behavior. The optimized device shows a large ON/OFF current ratio (2.85 × 10⁷), good charge retention (>10⁴ s), and reliable endurance properties. This study suggests that diazafluorene based donor–acceptor small molecular elements have great promise for high‐performance OFET memory.

中文翻译：

4,5-二氮杂芴基供体-受体小分子作为可调谐非易失性有机晶体管存储器的电荷捕获元件

通过浓硫酸介导的Friedel-Crafts反应设计并合成了三种作为小分子元素的二氮杂芴衍生物三苯胺(TPA)(PDAF) _n ( n = 1, 2, 3)。 TPA(PDAF) ₃具有高度非平面的拓扑结构，在固态下表现出较弱的分子间相互作用，因此表现出单纳米分子行为，这对于有机场效应晶体管 (OFET) 存储器件中存储和保留的电荷至关重要。此外，二氮杂芴衍生物具有完全独立的最高占据分子轨道/最低未占据分子轨道，这提供了理想的空穴和电子捕获位点。作为电荷存储元件，三苯胺基团提供空穴捕获位点，而二氮杂芴单元提供电子捕获位点并充当空穴阻挡基团以抑制三苯胺捕获的存储空穴的泄漏。溶液处理TPA(PDAF) ₃并五苯基OFET存储器件表现出良好的空穴捕获能力、高空穴捕获密度(4.55 × 10 ¹² cm ^-2 )、快捕获速度(<20 ms)、大存储容量窗口（89 V）和可调双极记忆行为。优化后的器件具有较大的开/关电流比 (2.85 × 10 ⁷ )、良好的电荷保持能力 (>10 ⁴ s) 和可靠的耐久性能。这项研究表明，基于二氮杂芴的供体-受体小分子元素对于高性能 OFET 存储器具有广阔的前景。

更新日期：2018-09-06

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