Properties of nanostructures produced by ion implantation

该提案的长期目标是利用离子束与物质相互作用的巨大可能性来开发高效的硅基光源和可用于各种材料的表面处理。短期和子目标是：1)研究硅纳米晶体（Si-nc）的生长和发光特性，2)优化Si-nc/SiO2层的光学增益，3)制作硅激光原型，4)研究离子束物质相互作用，特别是隔离材料，5)通过形成纳米结构表面来调节表面/界面特性，如润湿性，粘附性和功函数。全硅技术的发展将大大简化光电器件的集成。主要的里程碑是：1)验证和优化用于模拟光干涉对PL光谱影响的计算机代码，2)通过光干涉和双注入调制PL和EL光谱，3)确定Si-nc/SiO2层的光学和光发射特性随深度的函数，4)规范Si-nc/SiO2层的组成，从而提高光学增益，5)优化EL的电流注入效率。6)构建简单的光电器件，如硅激光器原型。表面性能的改变：许多与表面现象有关的问题，如雾、冰、灰尘和污垢的形成和积累，需要有效和持久的表面处理。主要的里程碑是：1)通过双重注入和/或化学钝化和/或纳米结构来控制超亲水表面的老化，2)产生超疏水纳米结构表面，3)确定表面分子组成，减少冰和污垢的粘附，4)优化工艺，从而调整纳米结构表面的表面功函数，5)利用Si-nc和纳米结构表面提高光伏电池效率。

THE LONG TERM OBJECTIVE of this proposal is to take advantage of the enormous possibilities of the interaction of ion beams with matter for the development of efficient Si-based light source and of surface treatments which can be used on various materials. The short term and sub-objectives are: 1) Investigation of growth and luminescence properties of silicon nanocrystals (Si-nc), 2) Optimisation of optical gain in Si-nc/SiO2 layers, 3) Fabrication of a Si laser prototype, 4) Study of ion beam matter interaction, especially for isolating materials, 5) Adjustment of the surface/interface properties such as wetting, adherence and work function by formation of nanostructured surfacesPHOTO- AND ELECTRO-LUMINESCENCE OF Si-nc: The development of an all-Si technology will considerable simplify the integration of the optoelectronic devices. The principal milestones are: 1) Validation and optimisation of our computer code used for the simulation of the light interference effect on the PL spectra, 2) Modulation of the PL and EL spectra by light interference and double implantation, 3) Determination of the optical and light emission properties of the Si-nc/SiO2 layer as a function of depth, 4) Specification of the Si-nc/SiO2 layer composition leading to an improvement of the optical gain, 5) Optimisation of the current injection efficiency for EL, 6) Construction of a simple optoelectronic device such as a Si laser prototype.MODIFICATION OF SURFACE PROPERTIES: Many problems related to surface phenomena such as formation and accumulation of fog, ice, dust and dirtiness, require efficient and durable surface treatment. The principal milestones are: 1) Ageing control of superhydrophilic surfaces by double implantation and/or chemical passivation and/or nanostructuration of the surfaces, 2) Production of superhydrophobic nanostructured surfaces, 3) Determination of surface molecular composition that reduces adhesion of ice and dirtiness, 4) Optimisation of the processes leading to the adjustment of the surface work function with nanostructured surfaces, 5) Increase of photovoltaic cell efficiency by using Si-nc and nanostructured surfaces.