Influence of Molecular Weight on the Organic Electrochemical Transistor Performance of Ladder‐Type Conjugated Polymers
Influence of Molecular Weight on the Organic Electrochemical Transistor Performance of Ladder‐Type Conjugated Polymers
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DOI：
10.1002/adma.202106235
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发表时间：
2021-10
影响因子：
29.4
通讯作者：
Han-Yan Wu;Chi-Yuan Yang;Qifan Li;N. Kolhe;X. Strakosas;Marc-Antoine Stoeckel;Ziang Wu;Wenlong Jin;Marios Savvakis;R. Kroon;Deyu Tu;H. Woo;M. Berggren;S. Jenekhe;S. Fabiano
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作者：
Han-Yan Wu;Chi-Yuan Yang;Qifan Li;N. Kolhe;X. Strakosas;Marc-Antoine Stoeckel;Ziang Wu;Wenlong Jin;Marios Savvakis;R. Kroon;Deyu Tu;H. Woo;M. Berggren;S. Jenekhe;S. Fabiano
有机电化学晶体管（OECT）有望开发各种高性能（生物）电子器件/电路。虽然基于p型半导体的OECT近年来取得了巨大的进步，但n型OECT仍然存在性能低下的问题，阻碍了高能效电子产品的发展。在这里，它表明，微调刚性，梯形n型聚合物聚的分子量，（苯并咪唑苯并菲咯啉）（BBL）仅一个数量级（从4.9到51 kDa）使得能够开发具有创纪录的高几何标准化构象的n型OECT（gm，norm <$11 S cm−1）和电子迁移率×体积电容（µC*<$26 F cm−1 V−1 s−1）、快速时间响应（0.38 ms）和低阈值电压（0.15 V）。OECT性能的这种增强归因于高分子量BBL中比低分子量对应物中更有效的分子间电荷传输。基于OECT的互补型逆变器还展示了高达100 V V−1的创纪录高电压增益和低至0.32 nW的超低功耗（取决于电源电压）。这些器件是迄今为止报道的最佳sub-1 V互补逆变器之一。这些发现证明了分子量在优化刚性有机混合离子电子导体的OECT性能方面的重要性，并为新一代节能有机（生物）电子器件开辟了道路。
Organic electrochemical transistors (OECTs) hold promise for developing a variety of high‐performance (bio‐)electronic devices/circuits. While OECTs based on p‐type semiconductors have achieved tremendous progress in recent years, n‐type OECTs still suffer from low performance, hampering the development of power‐efficient electronics. Here, it is demonstrated that fine‐tuning the molecular weight of the rigid, ladder‐type n‐type polymer poly(benzimidazobenzophenanthroline) (BBL) by only one order of magnitude (from 4.9 to 51 kDa) enables the development of n‐type OECTs with record‐high geometry‐normalized transconductance (gm,norm ≈ 11 S cm−1) and electron mobility × volumetric capacitance (µC* ≈ 26 F cm−1 V−1 s−1), fast temporal response (0.38 ms), and low threshold voltage (0.15 V). This enhancement in OECT performance is ascribed to a more efficient intermolecular charge transport in high‐molecular‐weight BBL than in the low‐molecular‐weight counterpart. OECT‐based complementary inverters are also demonstrated with record‐high voltage gains of up to 100 V V−1 and ultralow power consumption down to 0.32 nW, depending on the supply voltage. These devices are among the best sub‐1 V complementary inverters reported to date. These findings demonstrate the importance of molecular weight in optimizing the OECT performance of rigid organic mixed ionic–electronic conductors and open for a new generation of power‐efficient organic (bio‐)electronic devices.