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Materials World Network: Understanding and exploiting mixed, ultra-fast optical electrical behavior in nanoscale phase change materials

材料世界网络：了解和利用纳米级相变材料中的混合超快光电行为

基本信息

批准号：
221510646
负责人：
Professor Dr. Wolfram Hans Peter Pernice
金额：
--
依托单位：
Kirchhoff-Institut für Physik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/221510646?language=en
关键词：
Materials World Network Understanding exploiting

项目摘要

The objective of this proposal is to comprehensively investigate the material properties of chacogenides (both binary and ternary compounds) in mixed optical-electrical phase transitions. The underlying principle of memory storage in Ge-Sb-Te alloys is reversible crystalline to amorphous phase transitions that are associated with significant changes in optical reflectivity and electrical resistivity. However, although the optical and electrical mechanisms have been independently investigated, there is no work done on the mixed-mode operation, i.e. switching the material optically while probing it electrically and vice-versa. This is however extremely important for a host of potentially game-changing applications ranging from optically gated ultra-fast transistors to non-von-Neumann arithmetic processing. Our collaborative research will focus on investigating fundamental phase switching properties in mixed-mode, elucidating phase change mechanisms via dynamic optical probing of electrical phase transitions, and exploring the materials best suited for unconventional future arithmetic processors. To accomplish these challenging objectives, the following approach will be undertaken:1. The development of pulsed laser deposition (PLD) growth technique to synthesize complex ternary phase change nanowires with excellent control over chemical composition and diameters; followed by their structural, chemical and electrical characterization.2. The study phase-change dynamics by mixed-mode time-resolved femtosecond optical and ultrafast electrical measurements of phase switching behavior, and the dependence of such behavior on the chemical composition and size of the phase-change nanowires.3. A detailed study of the size-dependency of mixed-mode operation in phase change materials via a dedicated nano-photonics test bed

本计划的目的是全面研究chacogenides（包括二元和三元化合物）在混合光电相变中的材料性质。Ge-Sb-Te合金中的存储器存储的基本原理是可逆的结晶到非晶相变，其与光学反射率和电阻率的显著变化相关联。然而，尽管已经独立地研究了光学和电学机制，但是没有对混合模式操作进行研究，即在电学探测的同时光学地切换材料，反之亦然。然而，这对于从光选通超快晶体管到非冯·诺依曼算术处理的许多潜在的改变游戏规则的应用来说是极其重要的。我们的合作研究将集中在调查混合模式下的基本相位开关特性，通过动态光学探测电相变来阐明相变机制，并探索最适合于非常规未来算术处理器的材料。为了实现这些具有挑战性的目标，将采取以下方法：1. 发展了脉冲激光沉积（PLD）生长技术，合成了化学成分和直径可控的复杂三元相变纳米线，并对其结构、化学和电学特性进行了研究. 通过混合模式时间分辨飞秒光学和超快电学测量研究相变动力学，研究相变材料的相变行为，以及相变材料的化学成分和尺寸对相变行为的影响. 通过专用纳米光子学试验台详细研究相变材料中混合模式操作的尺寸依赖性