Synergistic Use of Pyridine and Selenophene in a Diketopyrrolopyrrole‐Based Conjugated Polymer Enhances the Electron Mobility in Organic Transistors,Advanced Functional Materials

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Synergistic Use of Pyridine and Selenophene in a Diketopyrrolopyrrole‐Based Conjugated Polymer Enhances the Electron Mobility in Organic Transistors
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-06-23 , DOI: 10.1002/adfm.202000489
Qian Liu ₁ , Shohei Kumagai ₂ , Sergei Manzhos ₃ , Yingqian Chen ₄ , Indunil Angunawela ₅ , Masrur Morshed Nahid ₅ , Krishna Feron _{6,

7} , Steven E. Bottle _{1,

8} , John Bell ₁ , Harald Ade ₅ , Jun Takeya ₂ , Prashant Sonar _{1,

8}

Affiliation

To achieve semiconducting materials with high electron mobility in organic field‐effect transistors (OFETs), low‐lying energy levels (the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO)) and favorable molecular packing and ordering are two crucial factors. Here, it is reported that the incorporation of pyridine and selenophene into the backbone of a diketopyrrolopyrrole (DPP)‐based copolymer produces a high‐electron‐mobility semiconductor, PDPPy‐Se. Compared with analogous polymers based on other DPP derivatives and selenophene, PDPPy‐Se features a lower LUMO that can decrease the electron transfer barrier for more effective electron injection, and simultaneously a lower HOMO that, however, can increase the hole transfer barrier to suppress the hole injection. Combined with thermal annealing at 240 °C for thin film morphology optimization to achieve large‐scale crystallite domains with tight molecular packing for effective charge transport along the conducting channel, OFET devices fabricated with PDPPy‐Se exhibit an n‐type‐dominant performance with an electron mobility (μ_e) as high as 2.22 cm² V⁻¹ s⁻¹ and a hole/electron mobility ratio (μ_h/μ_e) of 0.26. Overall, this study demonstrates a simple yet effective approach to boost the electron mobility in organic transistors by synergistic use of pyridine and selenophene in the backbone of a DPP‐based copolymer.

中文翻译：

在基于二酮吡咯并吡咯的共轭聚合物中吡啶和硒硒的协同使用可增强有机晶体管的电子迁移率

为了在有机场效应晶体管（OFET）中获得具有高电子迁移率的半导体材料，低能级（最高占据分子轨道（HOMO）和最低未占据分子轨道（LUMO））和良好的分子堆积和有序化是两个关键因素。在此，据报道，将吡啶和亚硒基掺入基于二酮吡咯并吡咯（DPP）的共聚物的主链中会产生高电子迁移率半导体PDPPy-Se。与基于其他DPP衍生物和硒烯的类似聚合物相比，PDPPy-Se的LUMO较低，可以降低电子传输势垒，从而实现更有效的电子注入;同时，HOPP较低，其HOMO更低，但可以增加空穴传输势垒，从而抑制电子注入。空穴注入。_ë）高达2.22厘米² V ^-1小号^-1和空穴/电子迁移率比（μ _ħ /μ _Ë的0.26）。总体而言，这项研究表明，在基于DPP的共聚物主链中协同使用吡啶和硒吩，可以提高有机晶体管中电子迁移率的简单有效方法。

更新日期：2020-08-19

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