Ag2X(X=S,Se,Te)量子点多激子产生机理及其在聚合物/量子点杂化太阳能电池中的应用研究

利用半导体量子点的多激子产生（MEG）效应提高激子产率是提高太阳能电池光电转换效率的有效策略。在已证实Ag2S量子点的MEG量子产率可以达到173%的基础上，本项目拟扩展Ag2Se和Ag2Te量子点为研究对象，以费米统计理论为研究方法，建立多激子动力学理论模型，通过光谱学、形貌学、光电性质等表征手段，研究Ag2X(X=S,Se,Te)量子点的MEG效率及相关影响机制，揭示其MEG效应在太阳能电池中的作用规律，阐明其在共轭聚合物/量子点杂化体系中多激子产生和复合的机理，从而推动以Ag2X量子点为光活性材料的，高效共轭聚合物/量子点杂化太阳能电池的制备。本项目研究的理论和方法不仅为制备高效量子点太阳能电池和共轭聚合物/量子点杂化太阳能电池提供关键参数，也为进一步研究耦合状态下量子点的光物理性质、拓宽其应用范围提供相关科学依据。

Using multiple exciton generation (MEG) effect of semiconductor quantum dots to improve exciton quantum efficiency is an effective strategy to improve the photoelectric conversion efficiency of solar cells. Based on the confirmed quantum efficiency of 173% of MEG of Ag2S quantum dots (QDs), this project is aimed to set up a QDs MEG dynamics theory model with statistical theory and Fermi approach. By characterizing Ag2Se and Ag2Te QDs with spectroscopic, topographical and photoelectronic approaches, we hope to find out what will affect the MEG of QDs and how it works. We also hope to illuminate how the multiple excitons generate and recombine in conjugated polymer/QDs hybrid systems. This project will help us to achieve highly efficient conjugated polymer/QDs hybrid solar cell based on Ag2X(X=S,Se,Te) QDs. The theory and method used this project will not only provide key parameters of making highly efficient QDs solar cells and conjugated polymer/QDs solar cells, but also help to investigate the photophysical properties of coupled QDs and provide scientific support that will help to broaden applications of the QDs.