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在聚合聚合物中对应变增强电荷传输的多层次分析

Seung Hyun Kim¹, Sangsik Park¹, Sein Chung¹

¹Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.

|November 4, 2024

概括

半导体聚合物的分子设计提高了应变下的灵活性和电性能. 更硬的聚合物骨干提高了机械耐用性,并为先进的灵活电子设备提供充电运输.

科学领域:

材料科学材料科学材料科学
聚合物化学聚合物化学
有机电子有机电子

背景情况:

灵活和可穿戴的电子产品需要具有高机械耐久性和在应变下稳定的电气性能的聚合物.
半导体聚合物对于这些应用至关重要,但它们的性能通常会随着变形而降低.

研究的目的:

调查分子设计,特别是骨干刚度如何影响基于二甲基 (DPP) 的半导体聚合物的机械和电荷传输特性.
为了将结构变化与在拉伸应变下增强的性能相关联.

主要方法:

基于DPP的聚合物的合成和表征,具有不同的骨干刚度 (DPP-4T和DPP-DTT).
微角中子散射和蒙特卡洛模拟以确定持久长度.
使用薄膜在elastomer和准自由立的方法进行机械测试.
在应变下孔移动性的电气特性.
光谱技术 (UV-vis,拉曼) 和X射线衍射 (XRD) 用于分析结构变化.

主要成果:

与DPP-DTT (32.8 nm) 相比,具有更灵活的骨干的DPP-4T表现出更长的持久长度 (20.4 nm).
DPP-4T实现了高裂纹开始应变 (>100%) 和骨折应变 (>30%),显示出优异的机械弹性.
由于应变引起的链条对齐和平面化,DPP-4T中的孔移动性在80%的应变时增加了180%.
结构分析显示,应变诱导的变化从扭曲到平面的聚合物形状,减少电荷跳跃障碍.

结论:

通过分子设计微调骨干刚性是提高半导体聚合物的机械强度和电荷传输的关键策略.
在应力下观察到的结构重组对于保持灵活设备的高电子性能至关重要.
这些发现为开发高度可靠的半导体聚合物为先进的灵活和可穿戴电子应用铺平了道路.

关键词:

脊柱平面化脊柱平面化链条的刚性链条的刚性运输费运输费运输费运输费结合聚合物的聚合物.机械变形的机械变形有机半导体有机半导体

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