Ambipolar organic field-effect transistors based on binary blends of n- and p-type semiconductors frequently suffer from low or unbalanced electron and hole transport. Uncontrolled phase separation and intermixing of donor and acceptor phases in such thin film blends lead to formation of bulk heterojunctions that lack sufficient percolation paths to ensure effective transport of free charge carriers of both signs. In this work, we present a novel approach to improve the functionality of ambipolar transistors based on a common conjugated polymer, namely poly(3-hexylthiophene) (P3HT), and a small molecular naphthalene derivative (NDI-C9). We studied the correlation between the morphology and the performance of P3HT and NDI-C9 blend transistors with bulk, bilayer and structured bulk-like heterostructures. The bulk heterostructure was obtained from solution, while the bilayer and ordered bulk-like morphologies were produced by a combination of solution and vacuum deposition. The best ambipolar performance with balanced electron and hole transport was found for the bulk-like heterojunction structures of NDI-C9 evaporated onto the P3HT fiber network spin-cast from a pre-aggregated toluene solution.

中文翻译：

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通过将溶液处理和升华相结合的双极性有机场效应晶体管实现超薄膜异质结†

基于n型和p型半导体的二元共混物的双极有机场效应晶体管经常遭受电子或空穴传输低或不平衡的困扰。在这种薄膜共混物中，供体相和受体相的不受控制的相分离和混合导致形成本体异质结，该异质结缺乏足够的渗流路径来确保两个符号的自由电荷载流子的有效传输。在这项工作中，我们提出了一种基于通用共轭聚合物即聚（3-己基噻吩）（P3HT）和小分子萘衍生物（NDI-C9）的改善双极性晶体管功能的新颖方法。我们研究了具有体，双层和结构化的体状异质结构的P3HT和NDI-C9混合晶体管的形态与性能之间的相关性。从溶液获得本体异质结构，而通过溶液和真空沉积的组合产生双层和有序的本体状形态。对于从预聚集的甲苯溶液中旋涂到P3HT纤维网络上的NDI-C9块状异质结结构，发现了具有平衡的电子和空穴传输的最佳双极性性能。