Improving OFF-State Bias-Stress Stability in High-Mobility Conjugated Polymer Transistors with an Antisolvent Treatment.
Improving OFF-State Bias-Stress Stability in High-Mobility Conjugated Polymer Transistors with an Antisolvent Treatment.
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通过反溶剂处理提高高迁移率共轭聚合物晶体管的断态偏置应力稳定性。
DOI：
10.1002/adma.202205377
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Nguyen M
中科院分区：
文献类型：
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作者：
Nguyen M
共轭聚合物场效应晶体管由于其优异的机械性能与足够高的电荷载流子迁移率以及与大面积低温加工的兼容性，正在成为柔性电子产品的一种使能技术。然而，它们的电稳定性仍然是一个问题。有机半导体中的ON态（累积模式）偏置应力不稳定性已被广泛研究，并提出了多种缓解策略。相比之下，关断状态（耗尽模式）偏置应力不稳定性仍然知之甚少，尽管对于晶体管大部分时间保持在关断状态的许多应用至关重要。在这里，提出了一种使用抗溶剂处理的简单方法，以实现关断状态偏置应力和环境稳定性的显着改善，以及性能最好的聚合物之一，可溶液加工的引达省二噻吩-共-苯并噻二唑（IDT-BT）的一般器件性能。IDT-BT是弱结晶的，并且归因于抗溶剂诱导的显著改善，结晶度增加，导致电子捕获和电荷陷阱去除的可能性降低。这项工作突出了微结构在弱结晶聚合物薄膜中的重要性，并提供了一种简单的加工策略，以实现柔性电子产品应用所需的可靠性。
Conjugated polymer field‐effect transistors are emerging as an enabling technology for flexible electronics due to their excellent mechanical properties combined with sufficiently high charge‐carrier mobilities and compatibility with large‐area, low‐temperature processing. However, their electrical stability remains a concern. ON‐state (accumulation mode) bias‐stress instabilities in organic semiconductors have been widely studied, and multiple mitigation strategies have been suggested. In contrast, OFF‐state (depletion mode) bias‐stress instabilities remain poorly understood despite being crucial for many applications in which the transistors are held in their OFF‐state for most of the time. Here, a simple method of using an antisolvent treatment is presented to achieve significant improvements in OFF‐state bias‐stress and environmental stability as well as general device performance for one of the best performing polymers, solution‐processable indacenodithiophene‐co‐benzothiadiazole (IDT‐BT). IDT‐BT is weakly crystalline, and the notable improvements to an antisolvent‐induced, increased degree of crystallinity, resulting in a lower probability of electron trapping and the removal of charge traps is attributed. The work highlights the importance of the microstructure in weakly crystalline polymer films and offers a simple processing strategy for achieving the reliability required for applications in flexible electronics.