Molecular Diodes and an Approch to Single Molecule Electronics

分子二极管和单分子电子学方法

• 批准号: EP/F000987/1
• 负责人: Geoff Ashwell
• 金额: $ 41.82万
• 依托单位: Bangor University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF000987%2F1
• 关键词: Molecular; Diodes; Approch; Single; Molecule

Molecular electronics represents the ultimate challenge in device miniaturisation: it provides the means to design components with specific properties and, in relation to this, a recent discovery from the applicant's group has resulted in the highest intrinsic rectification ratio to date from a molecular diode (Ashwell et al., Phys. Chem. Chem. Phys. 2006, 8, 3314). The reported current ratio of 3000 at +/-1 V represents a 150-fold improvement compared with the next highest reported value from another group. The discovery has attracted much attention: the paper was designated as a Hot Article in June 2006 and it has since been listed as a Top Ten paper on the Royal Society of Chemistry website for seven consecutive months and most accessed six times; it also features on the journal's cover and there are editorial highlights of the paper in Korean, Polish and UK journals. There are still few examples of intrinsic rectification from organic films and, until now, the reported current ratios have been far too small to have any practical significance. The aforementioned discovery overcomes this deficiency and the experimentally challenging objective of this proposal is to enhance the performance of molecular diodes when studied as ultra-thin films and ultimately single molecule devices. It will be attempted by (i) optimising the rectifying donor-acceptor sequence in sterically hindered Au/D-bridge-D*-bridge-A/Au and Au/D-bridge-A*-bridge-A/Au structures in which the asterisks represent weaker electroactive components and (ii) developing non-invasive contacting techniques that involve the post-fabrication self-assembly of single molecules or small molecular clusters across nano-sized gold electrode gaps. The aim is to utilise the discoveries made to date to increase the rectification ratio to 100,000 at +/-1 V.

分子电子学代表了设备小型化的终极挑战：它提供了设计具有特定属性的组件的方法，与此相关的是，申请人团队最近的一项发现导致了迄今为止分子二极管的最高本征整流率(Ashwell等人，Phys.)。化学。化学。太棒了。2006、8、3314)。报告的+/-1V电流比为3000，与另一组报告的第二高值相比，提高了150倍。这一发现引起了人们的极大关注：这篇论文在2006年6月被指定为热门文章，此后连续七个月被列为皇家化学学会网站上的十大论文，访问量最高的文章有六次；它还登上了该杂志的封面，韩国、波兰和英国的期刊上都有这篇论文的编辑亮点。有机薄膜内部整流的例子仍然很少，而且，到目前为止，报道的电流比太小，没有任何实际意义。前述发现克服了这一缺陷，该提议在实验上具有挑战性的目标是提高分子二极管作为超薄膜和最终单分子器件的性能。它将试图通过(I)优化空间受阻Au/D-Bridge-D*-Bridge-A/Au和Au/D-Bridge-A*-Bridge-A/Au结构中的整流施主-受体序列，其中星号代表较弱的电活性成分，以及(Ii)开发非侵入性接触技术，涉及单分子或小分子簇在纳米金电极间隙的后期自组装。目的是利用迄今的发现，将+/-1V时的精馏比提高到10万。