A DNA origami-brick system for the fabrication of nanoelectronic elements

金属和半导体纳米结构的生物分子模板合成有望高度并行化，从而具有成本效益的纳米电子器件组件制造。同时，DNA纳米技术的进步为生产具有可编程形状、大小和修饰的复杂生物分子模板提供了高度通用的途径。为了将生物分子结构转移到相应形状的无机纳米结构中，我们开发了一种基于DNA模具的构建套件，其中空心DNA结构可以用感兴趣的材料填充。建立了一个不同形状的模具元件库，可以以完全模块化的方式相互对接。这种方法可以灵活地获得具有复杂形状和不同材料组合的模具上层结构和无机纳米结构。在这个项目中，我们将进一步发展这种方法来实现更复杂的结构，代表具体的纳米电子器件配置。具体来说，基于半导体纳米棒的双极性晶体管，包括局部栅极和自旋阀结构将被制造出来。使用自组装方法与自顶向下光刻技术的复杂组合，获得的器件架构将进行电气集成和表征，并演示器件操作。测量结果将用于了解和优化金属、半导体和生物分子材料组合的不同组合之间的界面特性。通过这种方式，我们希望在纳米尺度上获得可复制的、自组装的电子设备。

Biomolecule-templated synthesis of metallic and semiconducting nanostructures promises a highly parallelized and thus cost-effective fabrication of nanoelectric device components. The advances in DNA nanotechnology provide meanwhile a highly versatile route to produce complex biomolecular templates with programmable shapes, sizes and modifications. To transfer the biomolecular structure into correspondingly shaped inorganic nanostructures, we developed a DNA mold-based construction kit, in which hollow DNA structures can be filled with a material of interest. A library of differently shaped mold elements was established that can be docked to each other in a fully modular manner. This way mold superstructures and thus inorganic nanostructures with complex shapes and different material combinations can be flexibly obtained. In this project, we will further develop this approach to realize more complex structures that represent concrete nanoelectronic device configurations. Specifically, ambipolar transistors based on semiconducting nanorods that include local gates as well as spin valve architectures shall be fabricated. Using a sophisticated combination of our self-assembly approach with top-down lithography, the obtained device architectures will be electrically integrated and characterized and the device operation will be demonstrated. The measurements will be used to understand and optimize the interface properties between the different combinations of metallic, semiconducting and biomolecular material combinations. This way we want to obtain reproducible, self-assembled electronic devices on the nanoscale.