正面方向与垂直有机电化学晶体管相匹配，具有高跨导和出色的非易失性,Advanced Functional Materials

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正面方向与垂直有机电化学晶体管相匹配，具有高跨导和出色的非易失性
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-12-27 , DOI: 10.1002/adfm.202312822
Bingjun Wang ₁ , Yuxin Kong ₂ , Sen Zhang ₁ , Ziang Wu ₃ , Shijie Wang ₁ , Jiaqi Ren ₂ , Han Young Woo ₃ , Yuxiang Li ₂ , Wei Ma ₁

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最近开发的有机电化学晶体管（OECT）的垂直结构可以将易失性和非易失性功能集成到一个可重构器件中，使其非常有前途。然而，与传统平面OECT（c-OECT）相比，对垂直OECT（v-OECT）工作原理和器件工程策略的理解仍然缺乏，阻碍了合理优化。由于c-OECT和v-OECT之间的主要区别在于它们的电荷传输方向性，而电荷传输方向性受微晶取向的影响很大，因此取向-器件结构匹配成为OECT的一个重要而突出的课题。在此，使用n型小分子 IDIC-MEG，研究这种匹配对 OECT 性能有多大影响。由于面内取向严重阻碍了面内电子传输，IDIC-MEG c-OECT 无法工作。令人惊讶的是，由于正面方向和垂直结构之间的匹配，只需将器件结构从平面改为垂直，所得 v-OECT 就可以在所有小分子 OECT 中表现出最高的跨导（46.3 mS）。这种匹配还带来了出色的非易失性，包括高度可预测的可编程性和良好的运行稳定性。这项工作首次明确证明了取向-器件结构匹配对于 OECT 优化的重要性，为实现高性能易失性和非易失性 OECT 建立了新的指导方针。

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Face-on Orientation Matches Vertical Organic Electrochemical Transistors for High Transconductance and Superior Non-Volatility

The recently developed vertical structure of organic electrochemical transistors (OECTs) can integrate volatile and non-volatile functions into one reconfigurable device, making it highly promising. However, comparing with the conventional planar OECT (c-OECT), the understanding of vertical OECT (v-OECT) working principles and device engineering strategies is still lacking, impeding rational optimization. Since a major difference between c- and v-OECTs is their charge transport directionality, which is highly influenced by crystallite orientations, the orientation–device structure match thus becomes an important yet outstanding topic for OECTs. Herein, using an n-type small molecule IDIC-MEG, investigate how much impact such match can have on OECT performance. The IDIC-MEG c-OECT fails to work due to the seriously hindered in-plane electron transport by face-on orientation. Surprisingly, simply changing the device structure from planar to vertical allows the resultant v-OECT to exhibit the highest reported transconductance (46.3 mS) among all small-molecule OECTs, thanks to the match between face-on orientation and the vertical structure. Such match also leads to excellent non-volatility, including highly predictable programmability and good operational stability. This work, for the first time, explicitly demonstrates the significance of orientation–device structure match for OECT optimization, establishing new guidelines for achieving high-performance volatile and non-volatile OECTs.

更新日期：2023-12-27

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