Direct Electrodeposition of Crystalline Groups IV and III-V Semiconductors by Electrochemical Liquid-Liquid-Solid Growth

通过电化学液-液-固生长直接电沉积 IV 族和 III-V 族晶体半导体

• 批准号: 1505635
• 负责人: Stephen Maldonado
• 金额: $ 44.79万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-15 至 2019-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1505635&HistoricalAwards=false
• 关键词: Direct; Electrodeposition; Crystalline; Groups; IV

With the support from the Macromolecular, Supramolecular and Nanochemistry Program of the Division of Chemistry and the Solid State and Materials Research Program of the Division of Materials Research, Prof. Stephen Maldonado of the University of Michigan aims to develop a novel, low-energy method for the preparation of technologically important crystalline semiconducting materials. Semiconductors are important materials for the fabrication of batteries, solar cells, and ultrafast microelectronics. Currently, energy-intensive methods are required for preparing high quality covalent semiconductors. This project provides to graduate and undergraduate students research training in electrochemistry, materials science, and advanced electron microscopic methods relevant to the fields of energy conversion/storage and microelectronics. In addition to disseminating research results in the form of publications and presentations at national conferences, Prof. Maldonado aimes to develop a new laboratory exercise on making semiconductor devices to introduce electrochemistry in the undergraduate curriculum.This research explores the use of electrochemical liquid-liquid-solid (ec-LLS) deposition as a synthetic and low-energy crystal growth method of semiconductors. The appeal of ec-LLS method is that it is a one-pot approach in which liquid metals are used simultaneously as sources of electrons for the reduction of semiconductor feedstock and as media for growing semiconductor crystals even at low temperatures. There are three main thrusts in this project. The first thrust aims to identify strategies and ec-LLS deposition parameters that effect desirable properties in Group IV (Ge, Si) macroscale crystals and micro/nanowires. This knowledge is essential for the predictive control of the morphological, crystallographic, and electronic properties of crystalline covalent semiconductors prepared through ec-LLS method. The second thrust involves ex-situ and in-situ (e.g. within optical and transmission electron microscopes) analyses to follow the nucleation and crystal growth steps in ec-LLS directly and in real time. The correlation between the current-time data and the specific nucleation and crystal growth steps provides real time feedback on the effects of various physicochemical and electrochemical factors on the crystals formed from ec-LLS. The third thrust focuses on understanding and controlling ec-LLS processes for tailored III-V (GaAs, InAs, GaSb, InSb) nanoparticles and nanowires.

在化学系高分子、超分子和纳米化学计划和材料研究部固态和材料研究计划的支持下，密歇根大学的斯蒂芬·马尔多纳多教授致力于开发一种新的、低能量的方法来制备具有重要技术价值的晶体半导体材料。半导体是制造电池、太阳能电池和超快微电子的重要材料。目前，制备高质量的共价半导体需要高耗能的方法。该项目为研究生和本科生提供电化学、材料科学以及与能量转换/存储和微电子学领域相关的高级电子显微镜方法的研究培训。除了以出版物和在全国会议上发表演讲的形式传播研究成果外，马尔多纳多教授还致力于开发一种新的制造半导体器件的实验室练习，以在本科课程中引入电化学。这项研究探索了电化学液-液-固(EC-LLS)沉积作为一种合成和低能量半导体晶体生长方法的使用。EC-LLS方法的吸引力在于它是一种一锅法，即使在低温下，液态金属也同时用作还原半导体原料的电子源和生长半导体晶体的介质。这个项目有三个主要的推动力。第一个重点是确定影响IV族(Ge，Si)大尺寸晶体和微/纳米线的理想性能的策略和EC-LLS沉积参数。这些知识对于通过EC-LLS方法制备的晶态共价半导体的形态、结晶学和电子性质的预测控制是必不可少的。第二个推力涉及非原位和原位(例如，在光学和透射电子显微镜内)分析，以直接和实时跟踪EC-LLS中的成核和晶体生长步骤。电流时间数据与特定的成核和晶体生长步骤之间的关联提供了关于各种物理化学和电化学因素对EC-LLS形成的晶体的影响的实时反馈。第三个重点是了解和控制定制III-V(GaAs、InAs、GaSb、InSb)纳米颗粒和纳米线的EC-LLS工艺。

项目成果

In Situ Transmission Electron Microscopy Measurements of Ge Nanowire Synthesis with Liquid Metal Nanodroplets in Water

• DOI: 10.1021/acsnano.9b06468
• 发表时间: 2020-03-24
• 期刊: ACS NANO
• 影响因子: 17.1
• 作者: Cheek, Quintin;Fahrenkrug, Eli;Maldonado, Stephen
• 通讯作者: Maldonado, Stephen