Coupled Organic-Inorganic Nanostructures: From Tailored Electronic Properties to Carrier-Selective Transport and Optoelectronic Devices

形状和大小可控的纳米粒子的突出物理特性已经被用于商业可用的技术：基于镉纳米粒子的具有前所未有的色深的高清电视，具有电力转换效率的可打印的硫化铅量子点太阳能电池&gt；8%，以及由硫属金属酸盐功能化的纳米粒子制成的柔性晶体管，这只是几个例子。基本上，所有上述技术进步都是由于对相邻纳米颗粒之间电子耦合的加深理解以及对纳米颗粒配位体球体的量身定做的操纵。在应用短链分子对纳米粒子表面进行功能化处理后，粒子-粒子的平均距离大大减小，从而改善了此类纳米粒子系综的电学功能和应用于其中的器件的性能。然而，这一策略通常需要使用像肼这样的危险物质，这限制了大规模的应用。此外，进一步改进的前景是有限的，因为在追求这一概念的过程中，最发达的协议已经应用了单原子配体，因此即使是较短的粒子粒子距离也不太可能。我们的项目解决了这个问题，并提供了一种不同的方法来处理耦合纳米颗粒固体：我们应用了有机半导体分子，这与短配体策略相比具有重要的优势：由于这些分子本身具有不同的电子结构，因此它们本身是导电的，因此它们可以为相邻的纳米颗粒之间的电子传输提供通道。通过用这种分子对纳米粒子表面进行功能化，我们试图探索这一新策略在制造光电子器件方面的前景

The outstanding physical properties of shape- and size-controlled nanoparticles are already being exploited for commercially available technologies: HD-televisions with unprecedented color depth on the basis of CdSe nanoparticles, printable lead sulfide quantum dot solar cells with power conversion efficiencies > 8 % and flexible transistors made from chalcogenidometalate-functionalized nanoparticles are only a few examples. Essentially, all of the above mentioned technological advances were realized due to a deepened understanding of the electronic coupling between adjacent nanoparticles and the tailored manipulation of the nanoparticles ligand sphere. Upon applying short-chained molecules to functionalize the nanoparticles surfaces, the mean particle-particle distance is drastically reduced which improves the electric functionality of ensembles of such nanoparticles and the performance of the devices in which they are applied. However, this strategy often requires hazardous substances like hydrazine which restricts large-scaleapplications. Moreover, the prospects of further improvements are limited as the most developed protocols in pursue of this conceptalready apply mono-atomic ligands, such that even shorted particleparticle distances are unlikely. Our project addresses this issue and provides a different approach to coupled nanoparticle solids: We apply organic semiconductor molecules which bear an importantadvantage over the short ligand strategy: Due to their distinct electronic structure, these molecules themselves are conductive suchthat they can provide a channel for electric transport between adjacent nanoparticles. By functionalizing the nanoparticles surfaceswith such molecules, we seek to explore the prospects of this novel strategy in the fabrication of optoelectronic devices