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化合成有望实现高度并行化并因此具有成本效益的纳米电子器件组件的制造。同时，DNA纳米技术的进步提供了一种高度多样化的方法来生产具有可编程形状、大小和修饰的复杂生物分子模板。为了将生物分子结构转化为相应形状的无机纳米结构，我们开发了一种基于DNA模子的构建试剂盒，其中空心DNA结构可以填充感兴趣的材料。建立了不同形状的模具单元库，可以以完全模块化的方式相互对接。通过这种方法，可以灵活地获得模具超结构，从而获得形状复杂、材料组合不同的无机纳米结构。在这个项目中，我们将进一步发展这种方法，以实现更复杂的结构，代表具体的纳米电子器件配置。具体地说，应该制造基于包括局部栅极和自旋阀结构的半导体纳米棒的双极型晶体管。使用我们的自组装方法和自上而下的光刻技术的复杂组合，所获得的器件架构将被电子集成和表征，并将演示器件的操作。这些测量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，我们想要在纳米尺度上获得可重现的、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.