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

本项目旨在确定多激励产生（MEG）过程是否可以提取多余的载流子。研究的材料将是硫代铅盐的纳米晶体，特别是硫化铅。纳米粒子将通过连接分子附着在金属金和光学透明电极上。随后，将利用循环伏安法（CV）、电化学阻抗谱（EIS）、光化学谱（PECS）和强度调制光电流谱（IMPS）等电化学和光电化学表征技术对PbS -电极体系进行研究。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存在的情况下进行，在不同颗粒大小的范围内，在低和高表面颗粒密度的情况下，然后对数据进行比较。将上述技术与电化学石英微天平（EQCM）研究相结合，将允许在每个粒子的基础上分配系综的性质。

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.