Charge Carrier Extraction Following Multiple Exciton Generation (MEG) in Semiconductor Nanocrystals

这个项目的目的是确定多激发产生（MEG）的过程中是否会导致多余的电荷载流子的提取。所研究的材料将是铅硫属化物盐的纳米晶体，特别是硫化铅。纳米粒子将被连接到金属金和光学透明电极使用连接分子。随后，将采用循环伏安法（CV）、电化学阻抗谱（EIS）、光电化学谱（佩奇）和强度调制光电流谱（IMPS）等电化学和光电化学表征技术来研究PbS -电极系统。将对数据进行建模，并确定电荷载流子转移过程和动力学。这将在MEG不存在的情况下进行，在MEG存在的情况下，对于一系列不同的颗粒尺寸以及低和高表面颗粒密度，然后比较数据。使用上述技术与电化学石英微天平（EQCM）的研究相结合，将允许在每个粒子的基础上分配的合奏的属性。

This project is designed to determine if the process of multiple excitation generation (MEG) can result in the extraction of excess charge carriers. The materials investigated will be nanocrystals of the lead chalcogenide salts, in particular lead sulphide. The nanoparticles will be attached to metallic gold and optically transparent electrodes using linking molecules. Subsequently the electrochemical and optoelectrochemical characterisation techniques of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Photoelectrochemical Spectroscopy (PECS) and Intensity Modulated Photocurrent Spectroscopy (IMPS) will be employed to investigate the PbS - electrode system. The data will be modelled and the charge carrier transfer processes and kinetics determined. This will be undertaken for codditions where MEG is absent, where it is present, for a range of different particle sizes and for low and high surface particle densities and then the data compared. Using the above techniques in combination with an electrochemical quartz microbalance (EQCM) study will allow the properties of the ensemble to be assigned on a per particle basis.