Here, we systematically investigated the effects of different carbon numbers or alkyl chain lengths of organic SAM interlayers on electrical properties of poly (dioctyl-quaterthiophenedioctyl-bithiazole) (PDQDB) organic field-effect transistors (OFETs). Although the end-group functionalities of organic interlayers were chemically identical, the phase state and structural ordering of polymeric chains in the organic SAM interlayers significantly affected the field-effect mobility (µ_FET) or threshold voltage (V_th). For cases where the PDQDB layer is interfaced with the highly ordered polymeric chains, the average µ_FETs demonstrated an increase from 0.11 to 0.17 cm²V⁻¹s⁻¹ when the chain length was changed from C8 to C18, respectively, with the V_th variations being negatively shifted. We confirmed that the conformation of polymeric chains in the organic SAM interlayers were not induced by the structural changes in the PDQDB film, which was verified by the crystalline and morphological analyses. Instead, the results could be explained in terms of the variations in the dipole arrangement with changes in the phase state or increased structural ordering of the polymeric alkyl chains in the SAM interlayers.

中文翻译：

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有机中间层的聚合物构象作为有机场效应晶体管电荷传输的确定参数

在这里，我们系统地研究了不同的碳数或有机SAM中间层的烷基链长度对聚（二辛基-四噻吩基二辛基-二噻唑）（PDQDB）有机场效应晶体管（OFET）的电性能的影响。尽管有机中间层的端基官能团在化学上是相同的，但有机SAM中间层中聚合物链的相态和结构顺序显着影响了场效应迁移率（µ _FET）或阈值电压（V _th）。对于PDQDB层与高度有序的聚合物链连接的情况，平均µ _FET s从0.11增至0.17 cm ² V ^-1 s^-1当链条长度从C8分别变为C18，与V_个变化被负向偏移。我们证实，有机SAM中间层中聚合物链的构象不是由PDQDB膜的结构变化引起的，这已通过晶体学和形态学分析得到了证实。取而代之的是，可以根据偶极子排列的变化，SAM中间层中聚合物烷基链的相态变化或增加的结构顺序来解释结果。