项目名称: 电流操控单分子界面电子转移动力学
项目编号: No.11204166
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 物理学I
项目作者: 张国峰
作者单位: 山西大学
项目金额: 30万元
中文摘要: 研究有机染料单分子与半导体材料界面的电子转移动力学特性对分子光量子器件等应用研究有着重要的作用。本项目通过测量分子荧光的强度和寿命变化的时间分辨荧光光谱研究单分子界面电子转移动力学特性,建立电流操控下的界面电子转移过程的微观物理模型;研究铟锡氧化物ITO半导体薄膜中各向异性的DiD单分子的电子转移效率受所处环境温度、气压以及外场等因素影响的物理机制;研究不同电流强度作用下的ITO半导体薄膜中的DiD单分子在分子能级和半导体导带之间的电子转移特性;研究通过半经典的电荷传输的理论模型来数值模拟电流操控下的界面电子转移特性。掌握单分子在电流操控下的界面电子转移在各分子能级和半导体导带之间受外部电流调制的机制以及低温环境(~4K)对单分子界面电子转移的影响,以优化的实验条件实现对单分子界面电子转移动力学的高效操控,界面电子转移率达到95%以上。
中文关键词: 单分子;电子转移;电场;操控;荧光特性
英文摘要: Interfacial election transfer dynamics between organic dye single molecules and semiconductors plays a critical role because of the extensive applications in all sorts of molecular optical quantum devices. The project researches DiD single-molecule interfacial electron transfer dynamics by measuring fluorescence intensity and lifetime, and establishing the theoretical model for the process of interfacial electron transfer manipulated by using external electric current. We will study the restricted mechanism of electron transfer efficiency for anisotropic DiD single molecules in ITO semiconductor film under different temperature, air pressure and external field and so on; study the electron transfer characters between molecular energy levels and conduction band of ITO; and study electric current manipulating interfacial electron transfer dynamics in the low temperature. In this way, we would acquire the modulating mechanism of single-molecule interfacial electron transfer between molecular energy levels and semiconductor's conductor band, and the low temperature's(~4K) impact on interfacial electron transfer. Achieving the most effective manipulation for single-molecule interfacial electron transfer dynamics with the optimized experimental conditions, the rate of interfacial electron transfer will reach to 95%.
英文关键词: single molecules;electron transfer;electric field;control;fluorescence