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Engineering terahertz photonic devices using semiconductor nanowires

使用半导体纳米线设计太赫兹光子器件

基本信息

批准号：
1929228
负责人：
金额：
--
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2017
资助国家：
英国
起止时间：
2017 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1929228
关键词：
Engineering terahertz photonic devices using

项目摘要

Key Objectives/Aim of the research:Mixed halide perovskites are highly promising semiconductors for photovoltaic applications due to their high optical absorption, long charge carrier lifetimes, versatile low-cost processing techniques etc. Their performance has improved dramatically over the past decade, increasing in power conversion efficiency and gradually overcoming the problems of temperature- and humidity-induced instability. Semiconductor nanowires can be engineered to achieve short charge-carrier lifetimes and high carrier mobilities, which enable them to be switched electronically or optically at high terahertz (THz) frequencies. Their crystal structure, facets, shape and orientation can be controlled to achieve tailored electrooptic coefficients and polarizability. These advantages set nanowires apart from traditional planar semiconductors.This project aims to investigate and understand the underlying optoelectronic mechanisms of photoinduced charge carriers transport within semiconductor materials such as mixed halide perovskite and semiconductor nanowires and how tuning fabrication factors improves their electrical and optical properties. Novel Physical Sciences/Engineering Methodology:The project will employ optical pump terahertz probe spectroscopy to investigate and characterise the ultrafast electrical and optical properties of semiconductor nanowires and mixed halide perovskites with high accuracy which would guide the development of terahertz devices and perovskite solar cells.

研究的主要目的/目的：混合卤化物钙钛矿由于其高光吸收、长载流子寿命、通用的低成本加工技术等，是非常有前途的光伏应用半导体。在过去的十年中，它们的性能得到了显着提高，功率转换效率不断提高，并逐渐克服了温度和湿度引起的不稳定问题。半导体纳米线可以设计为实现短载流子寿命和高载流子迁移率，这使得它们能够在高太赫兹（THz）频率下进行电子或光学切换。它们的晶体结构、晶面、形状和方向可以控制，以实现定制的电光系数和极化率。这些优点使纳米线有别于传统的平面半导体。该项目旨在研究和了解半导体材料（例如混合卤化物钙钛矿和半导体纳米线）内光生载流子传输的基本光电机制，以及调整制造因素如何改善其电学和光学性质。新颖的物理科学/工程方法：该项目将采用光泵太赫兹探针光谱来研究和高精度表征半导体纳米线和混合卤化物钙钛矿的超快电学和光学特性，这将指导太赫兹器件和钙钛矿太阳能电池的开发。